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litedram/examples/sim/micron/ddr3.v

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//`define MAX_MEM
`define MEM_BITS 20
/****************************************************************************************
*
* File Name: ddr3.v
* Version: 1.74
* Model: BUS Functional
*
* Dependencies: ddr3_parameters.vh
*
* Description: Micron SDRAM DDR3 (Double Data Rate 3)
*
* Limitation: - doesn't check for average refresh timings
* - positive ck and ck_n edges are used to form internal clock
* - positive dqs and dqs_n edges are used to latch data
* - test mode is not modeled
* - Duty Cycle Corrector is not modeled
* - Temperature Compensated Self Refresh is not modeled
* - DLL off mode is not modeled.
*
* Note: - Set simulator resolution to "ps" accuracy
* - Set DEBUG = 0 to disable $display messages
*
* Disclaimer This software code and all associated documentation, comments or other
* of Warranty: information (collectively "Software") is provided "AS IS" without
* warranty of any kind. MICRON TECHNOLOGY, INC. ("MTI") EXPRESSLY
* DISCLAIMS ALL WARRANTIES EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
* TO, NONINFRINGEMENT OF THIRD PARTY RIGHTS, AND ANY IMPLIED WARRANTIES
* OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. MTI DOES NOT
* WARRANT THAT THE SOFTWARE WILL MEET YOUR REQUIREMENTS, OR THAT THE
* OPERATION OF THE SOFTWARE WILL BE UNINTERRUPTED OR ERROR-FREE.
* FURTHERMORE, MTI DOES NOT MAKE ANY REPRESENTATIONS REGARDING THE USE OR
* THE RESULTS OF THE USE OF THE SOFTWARE IN TERMS OF ITS CORRECTNESS,
* ACCURACY, RELIABILITY, OR OTHERWISE. THE ENTIRE RISK ARISING OUT OF USE
* OR PERFORMANCE OF THE SOFTWARE REMAINS WITH YOU. IN NO EVENT SHALL MTI,
* ITS AFFILIATED COMPANIES OR THEIR SUPPLIERS BE LIABLE FOR ANY DIRECT,
* INDIRECT, CONSEQUENTIAL, INCIDENTAL, OR SPECIAL DAMAGES (INCLUDING,
* WITHOUT LIMITATION, DAMAGES FOR LOSS OF PROFITS, BUSINESS INTERRUPTION,
* OR LOSS OF INFORMATION) ARISING OUT OF YOUR USE OF OR INABILITY TO USE
* THE SOFTWARE, EVEN IF MTI HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGES. Because some jurisdictions prohibit the exclusion or
* limitation of liability for consequential or incidental damages, the
* above limitation may not apply to you.
*
* Copyright 2003 Micron Technology, Inc. All rights reserved.
*
* Rev Author Date Changes
* ---------------------------------------------------------------------------------------
* 0.41 JMK 05/12/06 Removed auto-precharge to power down error check.
* 0.42 JMK 08/25/06 Created internal clock using ck and ck_n.
* TDQS can only be enabled in EMR for x8 configurations.
* CAS latency is checked vs frequency when DLL locks.
* Improved checking of DQS during writes.
* Added true BL4 operation.
* 0.43 JMK 08/14/06 Added checking for setting reserved bits in Mode Registers.
* Added ODTS Readout.
* Replaced tZQCL with tZQinit and tZQoper
* Fixed tWRPDEN and tWRAPDEN during BC4MRS and BL4MRS.
* Added tRFC checking for Refresh to Power-Down Re-Entry.
* Added tXPDLL checking for Power-Down Exit to Refresh to Power-Down Entry
* Added Clock Frequency Change during Precharge Power-Down.
* Added -125x speed grades.
* Fixed tRCD checking during Write.
* 1.00 JMK 05/11/07 Initial release
* 1.10 JMK 06/26/07 Fixed ODTH8 check during BLOTF
* Removed temp sensor readout from MPR
* Updated initialization sequence
* Updated timing parameters
* 1.20 JMK 09/05/07 Updated clock frequency change
* Added ddr3_dimm module
* 1.30 JMK 01/23/08 Updated timing parameters
* 1.40 JMK 12/02/08 Added support for DDR3-1866 and DDR3-2133
* renamed ddr3_dimm.v to ddr3_module.v and added SODIMM support.
* Added multi-chip package model support in ddr3_mcp.v
* 1.50 JMK 05/04/08 Added 1866 and 2133 speed grades.
* 1.60 MYY 07/10/09 Merging of 1.50 version and pre-1.0 version changes
* 1.61 SPH 12/10/09 Only check tIH for cmd_addr if CS# LOW
* 1.62 SPH 10/26/10 Added 4Gb DDR3 SDRAM support
* 1.63 MYY 11/09/10 Added Dll Disable mode
* 1.64 MYY 07/28/11 Check dqs_in for dqs timing check
* 1.65 MYY 09/19/11 Widen internal bus width
* 1.66 MYY 01/20/12 Support ODT tied high feature
* 1.67 MYY 02/03/12 Added TJIT_PER margin for timing checks
* 1.68 SPH 04/02/12 Added memory preload
* 1.69 SPH 03/19/13 Update tZQCS, tZQinit, tZQoper timing parameters
* 1.70 SPH 04/08/14 Update tRFC to PRECHARGE check
* 1.71 SPH 04/21/14 Added 8Gb mono die parameters
* Remove strict CL check
* 1.72 DLH 06/18/15 calculate TZQCS from current tCK
* 1.73 SPH 08/20/15 calculate TZQINIT/TZQOPER from current tCK
* 1.74 SPH 09/08/15 Fix CWL 9 check to use 1071ps instead of 15e3/14 (round up error)
* Fix tIS don't care for Bank and Address when DES / NOP
*****************************************************************************************/
// DO NOT CHANGE THE TIMESCALE
// MAKE SURE YOUR SIMULATOR USES "PS" RESOLUTION
`timescale 1ps / 1ps
module ddr3 (
rst_n,
ck,
ck_n,
cke,
cs_n,
ras_n,
cas_n,
we_n,
dm_tdqs,
ba,
addr,
dq,
dqs,
dqs_n,
tdqs_n,
odt
);
`define den4096Mb
`define x16
`define sg125
`ifdef den1024Mb
`include "1024Mb_ddr3_parameters.vh"
`elsif den2048Mb
`include "2048Mb_ddr3_parameters.vh"
`elsif den4096Mb
`include "4096Mb_ddr3_parameters.vh"
`elsif den8192Mb
`include "8192Mb_ddr3_parameters.vh"
`else
// NOTE: Intentionally cause a compile fail here to force the users
// to select the correct component density before continuing
ERROR: You must specify component density with +define+den____Mb.
`endif
parameter check_strict_mrbits = 1;
parameter check_strict_timing = 1;
parameter feature_pasr = 1;
parameter feature_truebl4 = 0;
parameter feature_odt_hi = 0;
parameter PERTCKAVG=TDLLK;
// text macros
`define DQ_PER_DQS DQ_BITS/DQS_BITS
`define BANKS (1<<BA_BITS)
`define MAX_BITS (BA_BITS+ROW_BITS+COL_BITS-BL_BITS)
`define MAX_SIZE (1<<(BA_BITS+ROW_BITS+COL_BITS-BL_BITS))
`define MEM_SIZE (1<<MEM_BITS)
`define MAX_PIPE 4*CL_MAX
// Declare Ports
input rst_n;
input ck;
input ck_n;
input cke;
input cs_n;
input ras_n;
input cas_n;
input we_n;
inout [DM_BITS-1:0] dm_tdqs;
input [BA_BITS-1:0] ba;
input [ADDR_BITS-1:0] addr;
inout [DQ_BITS-1:0] dq;
inout [DQS_BITS-1:0] dqs;
inout [DQS_BITS-1:0] dqs_n;
output [DQS_BITS-1:0] tdqs_n;
input odt;
// clock jitter
real tck_avg;
time tck_sample [PERTCKAVG-1:0];
time tch_sample [PERTCKAVG:0];
time tcl_sample [PERTCKAVG:0];
time tck_i;
time tch_i;
time tcl_i;
real tch_avg;
real tcl_avg;
time tm_ck_pos;
time tm_ck_neg;
real tjit_per_rtime;
integer tjit_cc_time;
real terr_nper_rtime;
//DDR3 clock jitter variables
real tjit_ch_rtime;
integer duty_cycle;
// clock skew
integer out_delay;
integer dqsck [DQS_BITS-1:0];
integer dqsck_min;
integer dqsck_max;
integer dqsq_min;
integer dqsq_max;
integer seed;
// Mode Registers
reg [ADDR_BITS-1:0] mode_reg [`BANKS-1:0];
reg burst_order;
reg [BL_BITS:0] burst_length;
reg blotf;
reg truebl4;
integer cas_latency;
reg dll_reset;
reg dll_locked;
integer write_recovery;
reg low_power;
reg dll_en;
reg [2:0] odt_rtt_nom;
reg [1:0] odt_rtt_wr;
reg odt_en;
reg dyn_odt_en;
reg [1:0] al;
integer additive_latency;
reg write_levelization;
reg duty_cycle_corrector;
reg tdqs_en;
reg out_en;
reg [2:0] pasr;
integer cas_write_latency;
reg asr; // auto self refresh
reg srt; // self refresh temperature range
reg [1:0] mpr_select;
reg mpr_en;
reg odts_readout;
integer read_latency;
integer write_latency;
// cmd encoding
parameter // {cs, ras, cas, we}
LOAD_MODE = 4'b0000,
REFRESH = 4'b0001,
PRECHARGE = 4'b0010,
ACTIVATE = 4'b0011,
WRITE = 4'b0100,
READ = 4'b0101,
ZQ = 4'b0110,
NOP = 4'b0111,
// DESEL = 4'b1xxx,
PWR_DOWN = 4'b1000,
SELF_REF = 4'b1001
;
reg [8*9-1:0] cmd_string [9:0];
initial begin
cmd_string[LOAD_MODE] = "Load Mode";
cmd_string[REFRESH ] = "Refresh ";
cmd_string[PRECHARGE] = "Precharge";
cmd_string[ACTIVATE ] = "Activate ";
cmd_string[WRITE ] = "Write ";
cmd_string[READ ] = "Read ";
cmd_string[ZQ ] = "ZQ ";
cmd_string[NOP ] = "No Op ";
cmd_string[PWR_DOWN ] = "Pwr Down ";
cmd_string[SELF_REF ] = "Self Ref ";
end
// command state
reg [`BANKS-1:0] active_bank;
reg [`BANKS-1:0] auto_precharge_bank;
reg [`BANKS-1:0] write_precharge_bank;
reg [`BANKS-1:0] read_precharge_bank;
reg [ROW_BITS-1:0] active_row [`BANKS-1:0];
reg in_power_down;
reg in_self_refresh;
reg [3:0] init_mode_reg;
reg init_dll_reset;
reg init_done;
integer init_step;
reg zq_set;
reg er_trfc_max;
reg odt_state;
reg odt_state_dly;
reg dyn_odt_state;
reg dyn_odt_state_dly;
reg prev_odt;
wire [7:0] calibration_pattern = 8'b10101010; // value returned during mpr pre-defined pattern readout
wire [7:0] temp_sensor = 8'h01; // value returned during mpr temp sensor readout
reg [1:0] mr_chk;
reg rd_bc;
integer banki;
// cmd timers/counters
integer ref_cntr;
integer odt_cntr;
integer ck_cntr;
integer ck_txpr;
integer ck_load_mode;
integer ck_refresh;
integer ck_precharge;
integer ck_activate;
integer ck_write;
integer ck_read;
integer ck_zqinit;
integer ck_zqoper;
integer ck_zqcs;
integer ck_power_down;
integer ck_slow_exit_pd;
integer ck_self_refresh;
integer ck_freq_change;
integer ck_odt;
integer ck_odth8;
integer ck_dll_reset;
integer ck_cke_cmd;
integer ck_bank_write [`BANKS-1:0];
integer ck_bank_read [`BANKS-1:0];
integer ck_group_activate [1:0];
integer ck_group_write [1:0];
integer ck_group_read [1:0];
time tm_txpr;
time tm_load_mode;
time tm_refresh;
time tm_precharge;
time tm_activate;
time tm_write_end;
time tm_power_down;
time tm_slow_exit_pd;
time tm_self_refresh;
time tm_freq_change;
time tm_cke_cmd;
time tm_ttsinit;
time tm_bank_precharge [`BANKS-1:0];
time tm_bank_activate [`BANKS-1:0];
time tm_bank_write_end [`BANKS-1:0];
time tm_bank_read_end [`BANKS-1:0];
time tm_group_activate [1:0];
time tm_group_write_end [1:0];
// pipelines
reg [`MAX_PIPE:0] al_pipeline;
reg [`MAX_PIPE:0] wr_pipeline;
reg [`MAX_PIPE:0] rd_pipeline;
reg [`MAX_PIPE:0] odt_pipeline;
reg [`MAX_PIPE:0] dyn_odt_pipeline;
reg [BL_BITS:0] bl_pipeline [`MAX_PIPE:0];
reg [BA_BITS-1:0] ba_pipeline [`MAX_PIPE:0];
reg [ROW_BITS-1:0] row_pipeline [`MAX_PIPE:0];
reg [COL_BITS-1:0] col_pipeline [`MAX_PIPE:0];
reg prev_cke;
reg [5:0] cmd_tran_index, cmd_tran_i;
reg [63:0] cmd_tran_pipeline;
reg [2:0] cmd_n_in_pipeline [63:0];
reg [BA_BITS-1:0] ba_in_pipeline [63:0];
reg [ADDR_BITS-1:0] addr_in_pipeline [63:0];
// data state
reg [BL_MAX*DQ_BITS-1:0] memory_data;
reg [BL_MAX*DQ_BITS-1:0] bit_mask;
reg [BL_BITS-1:0] burst_position;
reg [BL_BITS:0] burst_cntr;
reg [DQ_BITS-1:0] dq_temp;
reg [63:0] check_write_postamble;
reg [63:0] check_write_preamble;
reg [63:0] check_write_dqs_high;
reg [63:0] check_write_dqs_low;
reg [31:0] check_dm_tdipw;
reg [127:0] check_dq_tdipw;
// data timers/counters
time tm_rst_n;
time tm_cke;
time tm_odt;
time tm_tdqss;
time tm_dm [31:0];
time tm_dqs [31:0];
time tm_dqs_pos [63:0];
time tm_dqss_pos [63:0];
time tm_dqs_neg [63:0];
time tm_dq [127:0];
time tm_cmd_addr [23:0];
reg [8*7-1:0] cmd_addr_string [23:0];
initial begin
cmd_addr_string[ 0] = "CS_N ";
cmd_addr_string[ 1] = "RAS_N ";
cmd_addr_string[ 2] = "CAS_N ";
cmd_addr_string[ 3] = "WE_N ";
cmd_addr_string[ 4] = "BA 0 ";
cmd_addr_string[ 5] = "BA 1 ";
cmd_addr_string[ 6] = "BA 2 ";
cmd_addr_string[ 7] = "ADDR 0";
cmd_addr_string[ 8] = "ADDR 1";
cmd_addr_string[ 9] = "ADDR 2";
cmd_addr_string[10] = "ADDR 3";
cmd_addr_string[11] = "ADDR 4";
cmd_addr_string[12] = "ADDR 5";
cmd_addr_string[13] = "ADDR 6";
cmd_addr_string[14] = "ADDR 7";
cmd_addr_string[15] = "ADDR 8";
cmd_addr_string[16] = "ADDR 9";
cmd_addr_string[17] = "ADDR 10";
cmd_addr_string[18] = "ADDR 11";
cmd_addr_string[19] = "ADDR 12";
cmd_addr_string[20] = "ADDR 13";
cmd_addr_string[21] = "ADDR 14";
cmd_addr_string[22] = "ADDR 15";
cmd_addr_string[23] = "ADDR 16";
end
reg [8*5-1:0] dqs_string [1:0];
initial begin
dqs_string[0] = "DQS ";
dqs_string[1] = "DQS_N";
end
// Memory Storage
`ifdef MAX_MEM
parameter RFF_BITS = DQ_BITS*BL_MAX;
// %z format uses 8 bytes for every 32 bits or less.
parameter RFF_CHUNK = 8 * (RFF_BITS/32 + (RFF_BITS%32 ? 1 : 0));
reg [1024:1] tmp_model_dir;
integer memfd[`BANKS-1:0];
initial
begin : file_io_open
reg [BA_BITS - 1 : 0] bank;
reg [ROW_BITS - 1 : 0] row;
reg [COL_BITS - 1 : 0] col;
reg [BA_BITS + ROW_BITS + COL_BITS - 1 : 0] addr;
reg [BL_MAX * DQ_BITS - 1 : 0] data;
string _char;
integer in, fio_status;
if (!$value$plusargs("model_data+%s", tmp_model_dir))
begin
tmp_model_dir = "/tmp";
$display(
"%m: at time %t WARNING: no +model_data option specified, using /tmp.",
$time
);
end
for (integer i = 0; i < `BANKS; i = i + 1)
memfd[i] = open_bank_file(i);
// Preload section
`ifdef mem_init
in = $fopen("mem_init.txt","r");
while (! $feof(in)) begin
fio_status = $fscanf(in, "%h %s %h", addr, _char, data);
if (fio_status != -1) begin // Check for blank line or EOF
bank = addr [BA_BITS + ROW_BITS + COL_BITS - 1 : ROW_BITS + COL_BITS];
row = addr [ROW_BITS + COL_BITS - 1 : COL_BITS];
col = addr [COL_BITS - 1 : 0];
memory_write (bank, row, col, data);
// Next 4 lines are for debug only
$display ("MEMORY_WRITE: Bank = %h, Row = %h, Col = %h, Data = %h", bank, row, col, data);
data = 'hx; // This is to reset data to verify memory_read
memory_read(bank, row, col, data);
$display ("MEMORY_READ: Bank = %h, Row = %h, Col = %h, Data = %h", bank, row, col, data);
end
end
$fclose(in);
//$finish;
`endif
end
`else
reg [BL_MAX*DQ_BITS-1:0] memory [0:`MEM_SIZE-1];
reg [`MAX_BITS-1:0] address [0:`MEM_SIZE-1];
reg [MEM_BITS:0] memory_index;
reg [MEM_BITS:0] memory_used = 0;
`endif
// receive
reg rst_n_in;
reg ck_in;
reg ck_n_in;
reg cke_in;
reg cs_n_in;
reg ras_n_in;
reg cas_n_in;
reg we_n_in;
reg [31:0] dm_in;
reg [2:0] ba_in;
reg [16:0] addr_in;
reg [127:0] dq_in;
reg [63:0] dqs_in;
reg odt_in;
reg [31:0] dm_in_pos;
reg [31:0] dm_in_neg;
reg [127:0] dq_in_pos;
reg [127:0] dq_in_neg;
reg dq_in_valid;
reg dqs_in_valid;
integer wdqs_cntr;
integer wdq_cntr;
integer wdqs_pos_cntr [63:0];
reg b2b_write;
reg [BL_BITS:0] wr_burst_length;
reg [63:0] prev_dqs_in;
reg diff_ck;
always @(rst_n ) rst_n_in <= #BUS_DELAY rst_n;
always @(ck ) ck_in <= #BUS_DELAY ck;
always @(ck_n ) ck_n_in <= #BUS_DELAY ck_n;
always @(cke )
cke_in <= #BUS_DELAY cke;
always @(cs_n ) cs_n_in <= #BUS_DELAY cs_n;
always @(ras_n ) ras_n_in <= #BUS_DELAY ras_n;
always @(cas_n ) cas_n_in <= #BUS_DELAY cas_n;
always @(we_n ) we_n_in <= #BUS_DELAY we_n;
always @(dm_tdqs) dm_in <= #BUS_DELAY dm_tdqs;
always @(ba ) ba_in <= #BUS_DELAY ba;
always @(addr ) addr_in <= #BUS_DELAY addr;
always @(dq ) dq_in <= #BUS_DELAY dq;
always @(dqs or dqs_n) dqs_in <= #BUS_DELAY (dqs_n<<32) | dqs;
always @(odt ) if (!feature_odt_hi) odt_in <= #BUS_DELAY odt;
// create internal clock
always @(posedge ck_in) diff_ck <= ck_in;
always @(posedge ck_n_in) diff_ck <= ~ck_n_in;
wire [31:0] dqs_even = dqs_in[31:0];
wire [31:0] dqs_odd = dqs_in[63:32];
// wire [3:0] cmd_n_in = !cs_n_in ? {ras_n_in, cas_n_in, we_n_in} : NOP; //deselect = nop
reg [3:0] cmd_n_in;
always @(cs_n_in or ras_n_in or cas_n_in or we_n_in)
cmd_n_in = !cs_n_in ? {ras_n_in, cas_n_in, we_n_in} : NOP;
// transmit
reg dqs_out_en;
reg [DQS_BITS-1:0] dqs_out_en_dly;
reg dqs_out;
reg [DQS_BITS-1:0] dqs_out_dly;
reg dq_out_en;
reg [DQ_BITS-1:0] dq_out_en_dly;
reg [DQ_BITS-1:0] dq_out;
reg [DQ_BITS-1:0] dq_out_dly;
integer rdqsen_cntr;
integer rdqs_cntr;
integer rdqen_cntr;
integer rdq_cntr;
bufif1 buf_dqs [DQS_BITS-1:0] (dqs, dqs_out_dly, dqs_out_en_dly & {DQS_BITS{out_en}});
bufif1 buf_dqs_n [DQS_BITS-1:0] (dqs_n, ~dqs_out_dly, dqs_out_en_dly & {DQS_BITS{out_en}});
bufif1 buf_dq [DQ_BITS-1:0] (dq, dq_out_dly, dq_out_en_dly & {DQ_BITS {out_en}});
assign tdqs_n = {DQS_BITS{1'bz}};
assign TZQCS = max( 64, ceil( 80000/tck_avg));
assign TZQINIT = max(512, ceil(640000/tck_avg));
assign TZQOPER = max(256, ceil(320000/tck_avg));
initial begin
if (BL_MAX < 2)
$display("%m ERROR: BL_MAX parameter must be >= 2. \nBL_MAX = %d", BL_MAX);
if ((1<<BO_BITS) > BL_MAX)
$display("%m ERROR: 2^BO_BITS cannot be greater than BL_MAX parameter.");
$timeformat (-12, 1, " ps", 1);
seed = RANDOM_SEED;
ck_cntr = 0;
end
function integer get_rtt_wr;
input [1:0] rtt;
begin
get_rtt_wr = RZQ/{rtt[0], rtt[1], 1'b0};
end
endfunction
function integer get_rtt_nom;
input [2:0] rtt;
begin
case (rtt)
1: get_rtt_nom = RZQ/4;
2: get_rtt_nom = RZQ/2;
3: get_rtt_nom = RZQ/6;
4: get_rtt_nom = RZQ/12;
5: get_rtt_nom = RZQ/8;
default : get_rtt_nom = 0;
endcase
end
endfunction
// calculate the absolute value of a real number
function real abs_value;
input arg;
real arg;
begin
if (arg < 0.0)
abs_value = -1.0 * arg;
else
abs_value = arg;
end
endfunction
function integer ceil;
input number;
real number;
// LMR 4.1.7
// When either operand of a relational expression is a real operand then the other operand shall be converted
// to an equivalent real value, and the expression shall be interpreted as a comparison between two real values.
if (number > $rtoi(number))
ceil = $rtoi(number) + 1;
else
ceil = number;
endfunction
function integer floor;
input number;
real number;
// LMR 4.1.7
// When either operand of a relational expression is a real operand then the other operand shall be converted
// to an equivalent real value, and the expression shall be interpreted as a comparison between two real values.
if (number < $rtoi(number))
floor = $rtoi(number) - 1;
else
floor = number;
endfunction
function int max( input int a, b );
max = (a < b) ? b : a;
endfunction
function int min( input int a, b );
min = (a > b) ? b : a;
endfunction
`ifdef MAX_MEM
function integer open_bank_file( input integer bank );
integer fd;
reg [2048:1] filename;
begin
$sformat( filename, "%0s/%m.%0d", tmp_model_dir, bank );
fd = $fopen(filename, "wb+");
if (fd == 0)
begin
$display("%m: at time %0t ERROR: failed to open %0s.", $time, filename);
$finish;
end
else
begin
if (DEBUG) $display("%m: at time %0t INFO: opening %0s.", $time, filename);
open_bank_file = fd;
end
end
endfunction
function [RFF_BITS:1] read_from_file(
input integer fd,
input integer index
);
integer code;
integer offset;
reg [1024:1] msg;
reg [RFF_BITS:1] read_value;
begin
offset = index * RFF_CHUNK;
code = $fseek( fd, offset, 0 );
// $fseek returns 0 on success, -1 on failure
if (code != 0)
begin
$display("%m: at time %t ERROR: fseek to %d failed", $time, offset);
$finish;
end
code = $fscanf(fd, "%z", read_value);
// $fscanf returns number of items read
if (code != 1)
begin
if ($ferror(fd,msg) != 0)
begin
$display("%m: at time %t ERROR: fscanf failed at %d", $time, index);
$display(msg);
$finish;
end
else
read_value = 'hx;
end
/* when reading from unwritten portions of the file, 0 will be returned.
* Use 0 in bit 1 as indicator that invalid data has been read.
* A true 0 is encoded as Z.
*/
if (read_value[1] === 1'bz)
// true 0 encoded as Z, data is valid
read_value[1] = 1'b0;
else if (read_value[1] === 1'b0)
// read from file section that has not been written
read_value = 'hx;
read_from_file = read_value;
end
endfunction
task write_to_file(
input integer fd,
input integer index,
input [RFF_BITS:1] data
);
integer code;
integer offset;
begin
offset = index * RFF_CHUNK;
code = $fseek( fd, offset, 0 );
if (code != 0)
begin
$display("%m: at time %t ERROR: fseek to %d failed", $time, offset);
$finish;
end
// encode a valid data
if (data[1] === 1'bz)
data[1] = 1'bx;
else if (data[1] === 1'b0)
data[1] = 1'bz;
$fwrite( fd, "%z", data );
end
endtask
`else
function get_index;
input [`MAX_BITS-1:0] addr;
begin : index
get_index = 0;
for (memory_index=0; memory_index<memory_used; memory_index=memory_index+1) begin
if (address[memory_index] == addr) begin
get_index = 1;
disable index;
end
end
end
endfunction
`endif
task memory_write;
input [BA_BITS-1:0] bank;
input [ROW_BITS-1:0] row;
input [COL_BITS-1:0] col;
input [BL_MAX*DQ_BITS-1:0] data;
reg [`MAX_BITS-1:0] addr;
begin
`ifdef MAX_MEM
addr = {row, col}/BL_MAX;
write_to_file( memfd[bank], addr, data );
`else
// chop off the lowest address bits
addr = {bank, row, col}/BL_MAX;
if (get_index(addr)) begin
address[memory_index] = addr;
memory[memory_index] = data;
end else if (memory_used == `MEM_SIZE) begin
$display ("%m: at time %t ERROR: Memory overflow. Write to Address %h with Data %h will be lost.\nYou must increase the MEM_BITS parameter or define MAX_MEM.", $time, addr, data);
if (STOP_ON_ERROR) $stop(0);
end else begin
address[memory_used] = addr;
memory[memory_used] = data;
memory_used = memory_used + 1;
end
`endif
end
endtask
task memory_read;
input [BA_BITS-1:0] bank;
input [ROW_BITS-1:0] row;
input [COL_BITS-1:0] col;
output [BL_MAX*DQ_BITS-1:0] data;
reg [`MAX_BITS-1:0] addr;
begin
`ifdef MAX_MEM
addr = {row, col}/BL_MAX;
data = read_from_file( memfd[bank], addr );
`else
// chop off the lowest address bits
addr = {bank, row, col}/BL_MAX;
if (get_index(addr)) begin
data = memory[memory_index];
end else begin
data = {BL_MAX*DQ_BITS{1'bx}};
end
`endif
end
endtask
task set_latency;
begin
if (al == 0) begin
additive_latency = 0;
end else begin
additive_latency = cas_latency - al;
end
if (dll_en)
read_latency = cas_latency + additive_latency;
else
read_latency = cas_latency + additive_latency - 1;
write_latency = cas_write_latency + additive_latency;
end
endtask
// this task will erase the contents of 0 or more banks
task erase_banks;
input [`BANKS-1:0] banks; //one select bit per bank
reg [BA_BITS-1:0] ba;
reg [`MAX_BITS-1:0] i;
integer bank;
begin
`ifdef MAX_MEM
for (bank = 0; bank < `BANKS; bank = bank + 1)
if (banks[bank] === 1'b1) begin
$fclose(memfd[bank]);
memfd[bank] = open_bank_file(bank);
end
`else
memory_index = 0;
i = 0;
// remove the selected banks
for (memory_index=0; memory_index<memory_used; memory_index=memory_index+1) begin
ba = (address[memory_index]>>(ROW_BITS+COL_BITS-BL_BITS));
if (!banks[ba]) begin //bank is selected to keep
address[i] = address[memory_index];
memory[i] = memory[memory_index];
i = i + 1;
end
end
// clean up the unused banks
for (memory_index=i; memory_index<memory_used; memory_index=memory_index+1) begin
address[memory_index] = 'bx;
memory[memory_index] = {8*DQ_BITS{1'bx}};
end
memory_used = i;
`endif
end
endtask
// Before this task runs, the model must be in a valid state for precharge power down and out of reset.
// After this task runs, NOP commands must be issued until TZQINIT has been met
task initialize;
input [ADDR_BITS-1:0] mode_reg0;
input [ADDR_BITS-1:0] mode_reg1;
input [ADDR_BITS-1:0] mode_reg2;
input [ADDR_BITS-1:0] mode_reg3;
begin
if (DEBUG) $display ("%m: at time %t INFO: Performing Initialization Sequence", $time);
cmd_task(prev_cke, 1, NOP, 'bx, 'bx);
cmd_task(prev_cke, 1, ZQ, 'bx, 'h400); //ZQCL
cmd_task(prev_cke, 1, LOAD_MODE, 3, mode_reg3);
cmd_task(prev_cke, 1, LOAD_MODE, 2, mode_reg2);
cmd_task(prev_cke, 1, LOAD_MODE, 1, mode_reg1);
cmd_task(prev_cke, 1, LOAD_MODE, 0, mode_reg0 | 'h100); // DLL Reset
cmd_task(prev_cke, 0, NOP, 'bx, 'bx);
end
endtask
task reset_task;
integer i;
begin
// disable inputs
dq_in_valid = 0;
dqs_in_valid <= 0;
wdqs_cntr = 0;
wdq_cntr = 0;
for (i=0; i<64; i=i+1) begin
wdqs_pos_cntr[i] <= 0;
end
b2b_write <= 0;
// disable outputs
out_en = 0;
dq_out_en = 0;
rdq_cntr = 0;
dqs_out_en = 0;
rdqs_cntr = 0;
// disable ODT
odt_en = 0;
dyn_odt_en = 0;
odt_state = 0;
dyn_odt_state = 0;
// reset bank state
active_bank = 0;
auto_precharge_bank = 0;
read_precharge_bank = 0;
write_precharge_bank = 0;
// require initialization sequence
init_done = 0;
mpr_en = 0;
init_step = 0;
init_mode_reg = 0;
init_dll_reset = 0;
zq_set = 0;
// reset DLL
dll_en = 0;
dll_reset = 0;
dll_locked = 0;
// exit power down and self refresh
prev_cke = 1'bx;
in_power_down = 0;
in_self_refresh = 0;
// clear pipelines
al_pipeline = 0;
wr_pipeline = 0;
rd_pipeline = 0;
odt_pipeline = 0;
dyn_odt_pipeline = 0;
cmd_tran_pipeline = 0;
cmd_tran_index = 0;
end
endtask
parameter SAME_BANK = 2'd0; // same bank, same group
parameter DIFF_BANK = 2'd1; // different bank, same group
parameter DIFF_GROUP = 2'd2; // different bank, different group
task chk_err;
input [1:0] relationship;
input [BA_BITS-1:0] bank;
input [3:0] fromcmd;
input [3:0] cmd;
reg err;
begin
// $display ("truebl4 = %d, relationship = %d, fromcmd = %h, cmd = %h", truebl4, relationship, fromcmd, cmd);
casex ({truebl4, relationship, fromcmd, cmd})
// load mode
{1'bx, DIFF_BANK , LOAD_MODE, LOAD_MODE} : begin if (ck_cntr - ck_load_mode < TMRD) $display ("%m: at time %t ERROR: tMRD violation during %s", $time, cmd_string[cmd]); end
{1'bx, DIFF_BANK , LOAD_MODE, READ } : begin if (($time - tm_load_mode < TMOD-TJIT_PER) || (ck_cntr - ck_load_mode < TMOD_TCK)) $display ("%m: at time %t ERROR: tMOD violation during %s", $time, cmd_string[cmd]); end
{1'bx, DIFF_BANK , LOAD_MODE, REFRESH } ,
{1'bx, DIFF_BANK , LOAD_MODE, PRECHARGE} ,
{1'bx, DIFF_BANK , LOAD_MODE, ACTIVATE } ,
{1'bx, DIFF_BANK , LOAD_MODE, ZQ } ,
{1'bx, DIFF_BANK , LOAD_MODE, PWR_DOWN } ,
{1'bx, DIFF_BANK , LOAD_MODE, SELF_REF } : begin if (($time - tm_load_mode < TMOD-TJIT_PER) || (ck_cntr - ck_load_mode < TMOD_TCK)) $display ("%m: at time %t ERROR: tMOD violation during %s", $time, cmd_string[cmd]); end
// refresh
{1'bx, DIFF_BANK , REFRESH , LOAD_MODE} ,
{1'bx, DIFF_BANK , REFRESH , REFRESH } ,
{1'bx, DIFF_BANK , REFRESH , PRECHARGE} ,
{1'bx, DIFF_BANK , REFRESH , ACTIVATE } ,
{1'bx, DIFF_BANK , REFRESH , ZQ } ,
{1'bx, DIFF_BANK , REFRESH , SELF_REF } : begin if ($time - tm_refresh < TRFC_MIN) $display ("%m: at time %t ERROR: tRFC violation during %s", $time, cmd_string[cmd]); end
{1'bx, DIFF_BANK , REFRESH , PWR_DOWN } : begin if (ck_cntr - ck_refresh < TREFPDEN) $display ("%m: at time %t ERROR: tREFPDEN violation during %s", $time, cmd_string[cmd]); end
// precharge
{1'bx, SAME_BANK , PRECHARGE, ACTIVATE } : begin if ($time - tm_bank_precharge[bank] < TRP-TJIT_PER) $display ("%m: at time %t ERROR: tRP violation during %s to bank %d", $time, cmd_string[cmd], bank); end
{1'bx, DIFF_BANK , PRECHARGE, LOAD_MODE} ,
{1'bx, DIFF_BANK , PRECHARGE, REFRESH } ,
{1'bx, DIFF_BANK , PRECHARGE, SELF_REF } : begin if ($time - tm_precharge < TRP-TJIT_PER) $display ("%m: at time %t ERROR: tRP violation during %s", $time, cmd_string[cmd]); end
{1'bx, DIFF_BANK , PRECHARGE, ZQ } :
begin if ($time - tm_precharge < TRP) $display ("%m: at time %t ERROR: tRP violation during %s", $time, cmd_string[cmd]); end
{1'bx, DIFF_BANK , PRECHARGE, PWR_DOWN } : ; //tPREPDEN = 1 tCK, can be concurrent with auto precharge
// activate
{1'bx, SAME_BANK , ACTIVATE , PRECHARGE} : begin if ($time - tm_bank_activate[bank] > TRAS_MAX) $display ("%m: at time %t ERROR: tRAS maximum violation during %s to bank %d", $time, cmd_string[cmd], bank);
if ($time - tm_bank_activate[bank] < TRAS_MIN-TJIT_PER) $display ("%m: at time %t ERROR: tRAS minimum violation during %s to bank %d", $time, cmd_string[cmd], bank);end
{1'bx, SAME_BANK , ACTIVATE , ACTIVATE } : begin if ($time - tm_bank_activate[bank] < TRC-TJIT_PER) $display ("%m: at time %t ERROR: tRC violation during %s to bank %d", $time, cmd_string[cmd], bank); end
{1'bx, SAME_BANK , ACTIVATE , WRITE } ,
{1'bx, SAME_BANK , ACTIVATE , READ } : ; // tRCD is checked outside this task
{1'b0, DIFF_BANK , ACTIVATE , ACTIVATE } : begin if (($time - tm_activate < TRRD) || (ck_cntr - ck_activate < TRRD_TCK)) $display ("%m: at time %t ERROR: tRRD violation during %s to bank %d", $time, cmd_string[cmd], bank); end
{1'b1, DIFF_BANK , ACTIVATE , ACTIVATE } : begin if (($time - tm_group_activate[bank[1]] < TRRD) || (ck_cntr - ck_group_activate[bank[1]] < TRRD_TCK)) $display ("%m: at time %t ERROR: tRRD violation during %s to bank %d", $time, cmd_string[cmd], bank); end
{1'b1, DIFF_GROUP, ACTIVATE , ACTIVATE } : begin if (($time - tm_activate < TRRD_DG) || (ck_cntr - ck_activate < TRRD_DG_TCK)) $display ("%m: at time %t ERROR: tRRD_DG violation during %s to bank %d", $time, cmd_string[cmd], bank); end
{1'bx, DIFF_BANK , ACTIVATE , REFRESH } : begin if ($time - tm_activate < TRC-TJIT_PER) $display ("%m: at time %t ERROR: tRC violation during %s", $time, cmd_string[cmd]); end
{1'bx, DIFF_BANK , ACTIVATE , PWR_DOWN } : begin if (ck_cntr - ck_activate < TACTPDEN) $display ("%m: at time %t ERROR: tACTPDEN violation during %s", $time, cmd_string[cmd]); end
// write
{1'bx, SAME_BANK , WRITE , PRECHARGE} : begin if (($time - tm_bank_write_end[bank] < TWR-TJIT_PER) || (ck_cntr - ck_bank_write[bank] <= write_latency + burst_length/2)) $display ("%m: at time %t ERROR: tWR violation during %s to bank %d", $time, cmd_string[cmd], bank); end
{1'b0, DIFF_BANK , WRITE , WRITE } : begin if (ck_cntr - ck_write < TCCD) $display ("%m: at time %t ERROR: tCCD violation during %s to bank %d", $time, cmd_string[cmd], bank); end
{1'b1, DIFF_BANK , WRITE , WRITE } : begin if (ck_cntr - ck_group_write[bank[1]] < TCCD) $display ("%m: at time %t ERROR: tCCD violation during %s to bank %d", $time, cmd_string[cmd], bank); end
{1'b0, DIFF_BANK , WRITE , READ } : begin if (ck_cntr - ck_write < write_latency + burst_length/2 + TWTR_TCK - additive_latency) $display ("%m: at time %t ERROR: tWTR violation during %s to bank %d", $time, cmd_string[cmd], bank); end
{1'b1, DIFF_BANK , WRITE , READ } : begin if (ck_cntr - ck_group_write[bank[1]] < write_latency + burst_length/2 + TWTR_TCK - additive_latency) $display ("%m: at time %t ERROR: tWTR violation during %s to bank %d", $time, cmd_string[cmd], bank); end
{1'b1, DIFF_GROUP, WRITE , WRITE } : begin if (ck_cntr - ck_write < TCCD_DG) $display ("%m: at time %t ERROR: tCCD_DG violation during %s to bank %d", $time, cmd_string[cmd], bank); end
{1'b1, DIFF_GROUP, WRITE , READ } : begin if (ck_cntr - ck_write < write_latency + burst_length/2 + TWTR_DG_TCK - additive_latency) $display ("%m: at time %t ERROR: tWTR_DG violation during %s to bank %d", $time, cmd_string[cmd], bank); end
{1'bx, DIFF_BANK , WRITE , PWR_DOWN } : begin if (($time - tm_write_end < TWR-TJIT_PER) || (ck_cntr - ck_write < write_latency + burst_length/2)) $display ("%m: at time %t ERROR: tWRPDEN violation during %s", $time, cmd_string[cmd]); end
// read
{1'bx, SAME_BANK , READ , PRECHARGE} : begin if (($time - tm_bank_read_end[bank] < TRTP-TJIT_PER) || (ck_cntr - ck_bank_read[bank] < additive_latency + TRTP_TCK)) $display ("%m: at time %t ERROR: tRTP violation during %s to bank %d", $time, cmd_string[cmd], bank); end
{1'b0, DIFF_BANK , READ , WRITE } : ; // tRTW is checked outside this task
{1'b1, DIFF_BANK , READ , WRITE } : ; // tRTW is checked outside this task
{1'b0, DIFF_BANK , READ , READ } : begin if (ck_cntr - ck_read < TCCD) $display ("%m: at time %t ERROR: tCCD violation during %s to bank %d", $time, cmd_string[cmd], bank); end
{1'b1, DIFF_BANK , READ , READ } : begin if (ck_cntr - ck_group_read[bank[1]] < TCCD) $display ("%m: at time %t ERROR: tCCD violation during %s to bank %d", $time, cmd_string[cmd], bank); end
{1'b1, DIFF_GROUP, READ , WRITE } : ; // tRTW is checked outside this task
{1'b1, DIFF_GROUP, READ , READ } : begin if (ck_cntr - ck_read < TCCD_DG) $display ("%m: at time %t ERROR: tCCD_DG violation during %s to bank %d", $time, cmd_string[cmd], bank); end
{1'bx, DIFF_BANK , READ , PWR_DOWN } : begin if (ck_cntr - ck_read < read_latency + 5) $display ("%m: at time %t ERROR: tRDPDEN violation during %s", $time, cmd_string[cmd]); end
// zq
{1'bx, DIFF_BANK , ZQ , LOAD_MODE} : ; // 1 tCK
{1'bx, DIFF_BANK , ZQ , REFRESH } ,
{1'bx, DIFF_BANK , ZQ , PRECHARGE} ,
{1'bx, DIFF_BANK , ZQ , ACTIVATE } ,
{1'bx, DIFF_BANK , ZQ , ZQ } ,
{1'bx, DIFF_BANK , ZQ , PWR_DOWN } ,
{1'bx, DIFF_BANK , ZQ , SELF_REF } : begin if (ck_cntr - ck_zqinit < TZQINIT) $display ("%m: at time %t ERROR: tZQinit violation during %s", $time, cmd_string[cmd]);
if (ck_cntr - ck_zqoper < TZQOPER) $display ("%m: at time %t ERROR: tZQoper violation during %s", $time, cmd_string[cmd]);
if (ck_cntr - ck_zqcs < TZQCS) $display ("%m: at time %t ERROR: tZQCS violation during %s", $time, cmd_string[cmd]); end
// power down
{1'bx, DIFF_BANK , PWR_DOWN , LOAD_MODE} ,
{1'bx, DIFF_BANK , PWR_DOWN , REFRESH } ,
{1'bx, DIFF_BANK , PWR_DOWN , PRECHARGE} ,
{1'bx, DIFF_BANK , PWR_DOWN , ACTIVATE } ,
{1'bx, DIFF_BANK , PWR_DOWN , WRITE } ,
{1'bx, DIFF_BANK , PWR_DOWN , ZQ } : begin if (($time - tm_power_down < TXP) || (ck_cntr - ck_power_down < TXP_TCK)) $display ("%m: at time %t ERROR: tXP violation during %s", $time, cmd_string[cmd]); end
{1'bx, DIFF_BANK , PWR_DOWN , READ } : begin if (($time - tm_power_down < TXP) || (ck_cntr - ck_power_down < TXP_TCK)) $display ("%m: at time %t ERROR: tXP violation during %s", $time, cmd_string[cmd]);
else if (($time - tm_slow_exit_pd < TXPDLL) || (ck_cntr - ck_slow_exit_pd < TXPDLL_TCK)) $display ("%m: at time %t ERROR: tXPDLL violation during %s", $time, cmd_string[cmd]); end
{1'bx, DIFF_BANK , PWR_DOWN , PWR_DOWN } ,
{1'bx, DIFF_BANK , PWR_DOWN , SELF_REF } : begin if (($time - tm_power_down < TXP) || (ck_cntr - ck_power_down < TXP_TCK)) $display ("%m: at time %t ERROR: tXP violation during %s", $time, cmd_string[cmd]);
if ((tm_power_down > tm_refresh) && ($time - tm_refresh < TRFC_MIN)) $display ("%m: at time %t ERROR: tRFC violation during %s", $time, cmd_string[cmd]);
if ((tm_refresh > tm_power_down) && (($time - tm_power_down < TXPDLL) || (ck_cntr - ck_power_down < TXPDLL_TCK))) $display ("%m: at time %t ERROR: tXPDLL violation during %s", $time, cmd_string[cmd]);
if (($time - tm_cke_cmd < TCKE) || (ck_cntr - ck_cke_cmd < TCKE_TCK)) $display ("%m: at time %t ERROR: tCKE violation on CKE", $time); end
// self refresh
{1'bx, DIFF_BANK , SELF_REF , LOAD_MODE} ,
{1'bx, DIFF_BANK , SELF_REF , REFRESH } ,
{1'bx, DIFF_BANK , SELF_REF , PRECHARGE} ,
{1'bx, DIFF_BANK , SELF_REF , ACTIVATE } ,
{1'bx, DIFF_BANK , SELF_REF , WRITE } ,
{1'bx, DIFF_BANK , SELF_REF , ZQ } : begin if (($time - tm_self_refresh < TXS) || (ck_cntr - ck_self_refresh < TXS_TCK)) $display ("%m: at time %t ERROR: tXS violation during %s", $time, cmd_string[cmd]); end
{1'bx, DIFF_BANK , SELF_REF , READ } : begin if (ck_cntr - ck_self_refresh < TXSDLL) $display ("%m: at time %t ERROR: tXSDLL violation during %s", $time, cmd_string[cmd]); end
{1'bx, DIFF_BANK , SELF_REF , PWR_DOWN } ,
{1'bx, DIFF_BANK , SELF_REF , SELF_REF } : begin if (($time - tm_self_refresh < TXS) || (ck_cntr - ck_self_refresh < TXS_TCK)) $display ("%m: at time %t ERROR: tXS violation during %s", $time, cmd_string[cmd]);
if (($time - tm_cke_cmd < TCKE) || (ck_cntr - ck_cke_cmd < TCKE_TCK)) $display ("%m: at time %t ERROR: tCKE violation on CKE", $time); end
endcase
end
endtask
task cmd_task;
inout prev_cke;
input cke;
input [2:0] cmd;
input [BA_BITS-1:0] bank;
input [ADDR_BITS-1:0] addr;
reg [`BANKS:0] i;
integer j;
reg [`BANKS:0] tfaw_cntr;
reg [COL_BITS-1:0] col;
reg group;
begin
// tRFC max check
if (!er_trfc_max && !in_self_refresh) begin
if ($time - tm_refresh > TRFC_MAX && check_strict_timing) begin
$display ("%m: at time %t ERROR: tRFC maximum violation during %s", $time, cmd_string[cmd]);
er_trfc_max = 1;
end
end
if (cke) begin
if ((cmd < NOP) && (cmd != PRECHARGE)) begin
if (($time - tm_txpr < TXPR) || (ck_cntr - ck_txpr < TXPR_TCK))
$display ("%m: at time %t ERROR: tXPR violation during %s", $time, cmd_string[cmd]);
for (j=0; j<=SELF_REF; j=j+1) begin
chk_err(SAME_BANK , bank, j, cmd);
chk_err(DIFF_BANK , bank, j, cmd);
chk_err(DIFF_GROUP, bank, j, cmd);
end
end
case (cmd)
LOAD_MODE : begin
if (|odt_pipeline)
$display ("%m: at time %t ERROR: ODTL violation during %s", $time, cmd_string[cmd]);
if (odt_state && !feature_odt_hi)
$display ("%m: at time %t ERROR: ODT must be off prior to %s", $time, cmd_string[cmd]);
if (|active_bank) begin
$display ("%m: at time %t ERROR: %s Failure. All banks must be Precharged.", $time, cmd_string[cmd]);
if (STOP_ON_ERROR) $stop(0);
end else begin
if (DEBUG) $display ("%m: at time %t INFO: %s %d", $time, cmd_string[cmd], bank);
if (bank>>2) begin
$display ("%m: at time %t ERROR: %s %d Illegal value. Reserved bank bits must be programmed to zero", $time, cmd_string[cmd], bank);
end
case (bank)
0 : begin
// Burst Length
if (addr[1:0] == 2'b00) begin
burst_length = 8;
blotf = 0;
truebl4 = 0;
if (DEBUG) $display ("%m: at time %t INFO: %s %d Burst Length = %d", $time, cmd_string[cmd], bank, burst_length);
end else if (addr[1:0] == 2'b01) begin
burst_length = 8;
blotf = 1;
if (DEBUG) $display ("%m: at time %t INFO: %s %d Burst Length = Select via A12", $time, cmd_string[cmd], bank);
end else if (addr[1:0] == 2'b10) begin
burst_length = 4;
blotf = 0;
if (DEBUG) $display ("%m: at time %t INFO: %s %d Burst Length = Fixed %d (chop)", $time, cmd_string[cmd], bank, burst_length);
end else begin
$display ("%m: at time %t ERROR: %s %d Illegal Burst Length = %d", $time, cmd_string[cmd], bank, addr[1:0]);
end
// Burst Order
burst_order = addr[3];
if (!burst_order) begin
if (DEBUG) $display ("%m: at time %t INFO: %s %d Burst Order = Sequential", $time, cmd_string[cmd], bank);
end else if (burst_order) begin
if (DEBUG) $display ("%m: at time %t INFO: %s %d Burst Order = Interleaved", $time, cmd_string[cmd], bank);
end else begin
$display ("%m: at time %t ERROR: %s %d Illegal Burst Order = %d", $time, cmd_string[cmd], bank, burst_order);
end
// CAS Latency
cas_latency = {addr[2],addr[6:4]} + 4;
set_latency;
if ((cas_latency >= CL_MIN) && (cas_latency <= CL_MAX)) begin
if (DEBUG) $display ("%m: at time %t INFO: %s %d CAS Latency = %d", $time, cmd_string[cmd], bank, cas_latency);
end else begin
$display ("%m: at time %t ERROR: %s %d Illegal CAS Latency = %d", $time, cmd_string[cmd], bank, cas_latency);
end
// Reserved
if (addr[7] !== 0 && check_strict_mrbits) begin
$display ("%m: at time %t ERROR: %s %d Illegal value. Reserved address bits must be programmed to zero", $time, cmd_string[cmd], bank);
end
// DLL Reset
dll_reset = addr[8];
if (!dll_reset) begin
if (DEBUG) $display ("%m: at time %t INFO: %s %d DLL Reset = Normal", $time, cmd_string[cmd], bank);
end else if (dll_reset) begin
if (DEBUG) $display ("%m: at time %t INFO: %s %d DLL Reset = Reset DLL", $time, cmd_string[cmd], bank);
dll_locked = 0;
init_dll_reset = 1;
ck_dll_reset <= ck_cntr;
end else begin
$display ("%m: at time %t ERROR: %s %d Illegal DLL Reset = %d", $time, cmd_string[cmd], bank, dll_reset);
end
// Write Recovery
if (addr[11:9] == 0) begin
write_recovery = 16;
end else if (addr[11:9] < 4) begin
write_recovery = addr[11:9] + 4;
end else begin
write_recovery = 2*addr[11:9];
end
if ((write_recovery >= WR_MIN) && (write_recovery <= WR_MAX)) begin
if (DEBUG) $display ("%m: at time %t INFO: %s %d Write Recovery = %d", $time, cmd_string[cmd], bank, write_recovery);
end else begin
$display ("%m: at time %t ERROR: %s %d Illegal Write Recovery = %d", $time, cmd_string[cmd], bank, write_recovery);
end
// Power Down Mode
low_power = !addr[12];
if (!low_power) begin
if (DEBUG) $display ("%m: at time %t INFO: %s %d Power Down Mode = DLL on", $time, cmd_string[cmd], bank);
end else if (low_power) begin
if (DEBUG) $display ("%m: at time %t INFO: %s %d Power Down Mode = DLL off", $time, cmd_string[cmd], bank);
end else begin
$display ("%m: at time %t ERROR: %s %d Illegal Power Down Mode = %d", $time, cmd_string[cmd], bank, low_power);
end
// Reserved
if (ADDR_BITS>13 && addr[13] !== 0 && check_strict_mrbits) begin
$display ("%m: at time %t ERROR: %s %d Illegal value. Reserved address bits must be programmed to zero", $time, cmd_string[cmd], bank);
end
end
1 : begin
// DLL Enable
dll_en = !addr[0];
if (!dll_en) begin
if (DEBUG) $display ("%m: at time %t INFO: %s %d DLL Enable = Disabled", $time, cmd_string[cmd], bank);
if (check_strict_mrbits) $display ("%m: at time %t WARNING: %s %d DLL off mode is not fully modeled", $time, cmd_string[cmd], bank);
end else if (dll_en) begin
if (DEBUG) $display ("%m: at time %t INFO: %s %d DLL Enable = Enabled", $time, cmd_string[cmd], bank);
end else begin
$display ("%m: at time %t ERROR: %s %d Illegal DLL Enable = %d", $time, cmd_string[cmd], bank, dll_en);
end
// Output Drive Strength
if ({addr[5], addr[1]} == 2'b00) begin
if (DEBUG) $display ("%m: at time %t INFO: %s %d Output Drive Strength = %d Ohm", $time, cmd_string[cmd], bank, RZQ/6);
end else if ({addr[5], addr[1]} == 2'b01) begin
if (DEBUG) $display ("%m: at time %t INFO: %s %d Output Drive Strength = %d Ohm", $time, cmd_string[cmd], bank, RZQ/7);
end else if ({addr[5], addr[1]} == 2'b11) begin
if (DEBUG) $display ("%m: at time %t INFO: %s %d Output Drive Strength = %d Ohm", $time, cmd_string[cmd], bank, RZQ/5);
end else begin
$display ("%m: at time %t ERROR: %s %d Illegal Output Drive Strength = %d", $time, cmd_string[cmd], bank, {addr[5], addr[1]});
end
// ODT Rtt (Rtt_NOM)
odt_rtt_nom = {addr[9], addr[6], addr[2]};
if (odt_rtt_nom == 3'b000) begin
if (DEBUG) $display ("%m: at time %t INFO: %s %d ODT Rtt = Disabled", $time, cmd_string[cmd], bank);
odt_en = 0;
end else if ((odt_rtt_nom < 4) || ((!addr[7] || (addr[7] && addr[12])) && (odt_rtt_nom < 6))) begin
if (DEBUG) $display ("%m: at time %t INFO: %s %d ODT Rtt = %d Ohm", $time, cmd_string[cmd], bank, get_rtt_nom(odt_rtt_nom));
odt_en = 1;
end else begin
$display ("%m: at time %t ERROR: %s %d Illegal ODT Rtt = %d", $time, cmd_string[cmd], bank, odt_rtt_nom);
odt_en = 0;
end
// Report the additive latency value
al = addr[4:3];
set_latency;
if (al == 0) begin
if (DEBUG) $display ("%m: at time %t INFO: %s %d Additive Latency = %d", $time, cmd_string[cmd], bank, al);
end else if ((al >= AL_MIN) && (al <= AL_MAX)) begin
if (DEBUG) $display ("%m: at time %t INFO: %s %d Additive Latency = CL - %d", $time, cmd_string[cmd], bank, al);
end else begin
$display ("%m: at time %t ERROR: %s %d Illegal Additive Latency = %d", $time, cmd_string[cmd], bank, al);
end
// Write Levelization
write_levelization = addr[7];
if (!write_levelization) begin
if (DEBUG) $display ("%m: at time %t INFO: %s %d Write Levelization = Disabled", $time, cmd_string[cmd], bank);
end else if (write_levelization) begin
if (DEBUG) $display ("%m: at time %t INFO: %s %d Write Levelization = Enabled", $time, cmd_string[cmd], bank);
end else begin
$display ("%m: at time %t ERROR: %s %d Illegal Write Levelization = %d", $time, cmd_string[cmd], bank, write_levelization);
end
// Reserved
if (addr[8] !== 0 && check_strict_mrbits) begin
$display ("%m: at time %t ERROR: %s %d Illegal value. Reserved address bits must be programmed to zero", $time, cmd_string[cmd], bank);
end
// Reserved
if (addr[10] !== 0 && check_strict_mrbits) begin
$display ("%m: at time %t ERROR: %s %d Illegal value. Reserved address bits must be programmed to zero", $time, cmd_string[cmd], bank);
end
// TDQS Enable
tdqs_en = addr[11];
if (!tdqs_en) begin
if (DEBUG) $display ("%m: at time %t INFO: %s %d TDQS Enable = Disabled", $time, cmd_string[cmd], bank);
end else if (tdqs_en) begin
if (8 == DQ_BITS) begin
if (DEBUG) $display ("%m: at time %t INFO: %s %d TDQS Enable = Enabled", $time, cmd_string[cmd], bank);
end
else begin
$display ("%m: at time %t WARNING: %s %d Illegal TDQS Enable. TDQS only exists on a x8 part", $time, cmd_string[cmd], bank);
tdqs_en = 0;
end
end else begin
$display ("%m: at time %t ERROR: %s %d Illegal TDQS Enable = %d", $time, cmd_string[cmd], bank, tdqs_en);
end
// Output Enable
out_en = !addr[12];
if (!out_en) begin
if (DEBUG) $display ("%m: at time %t INFO: %s %d Qoff = Disabled", $time, cmd_string[cmd], bank);
end else if (out_en) begin
if (DEBUG) $display ("%m: at time %t INFO: %s %d Qoff = Enabled", $time, cmd_string[cmd], bank);
end else begin
$display ("%m: at time %t ERROR: %s %d Illegal Qoff = %d", $time, cmd_string[cmd], bank, out_en);
end
// Reserved
if (ADDR_BITS>13 && addr[13] !== 0 && check_strict_mrbits) begin
$display ("%m: at time %t ERROR: %s %d Illegal value. Reserved address bits must be programmed to zero", $time, cmd_string[cmd], bank);
end
end
2 : begin
if (feature_pasr) begin
// Partial Array Self Refresh
pasr = addr[2:0];
case (pasr)
3'b000 : if (DEBUG) $display ("%m: at time %t INFO: %s %d Partial Array Self Refresh = Bank 0-7", $time, cmd_string[cmd], bank);
3'b001 : if (DEBUG) $display ("%m: at time %t INFO: %s %d Partial Array Self Refresh = Bank 0-3", $time, cmd_string[cmd], bank);
3'b010 : if (DEBUG) $display ("%m: at time %t INFO: %s %d Partial Array Self Refresh = Bank 0-1", $time, cmd_string[cmd], bank);
3'b011 : if (DEBUG) $display ("%m: at time %t INFO: %s %d Partial Array Self Refresh = Bank 0", $time, cmd_string[cmd], bank);
3'b100 : if (DEBUG) $display ("%m: at time %t INFO: %s %d Partial Array Self Refresh = Bank 2-7", $time, cmd_string[cmd], bank);
3'b101 : if (DEBUG) $display ("%m: at time %t INFO: %s %d Partial Array Self Refresh = Bank 4-7", $time, cmd_string[cmd], bank);
3'b110 : if (DEBUG) $display ("%m: at time %t INFO: %s %d Partial Array Self Refresh = Bank 6-7", $time, cmd_string[cmd], bank);
3'b111 : if (DEBUG) $display ("%m: at time %t INFO: %s %d Partial Array Self Refresh = Bank 7", $time, cmd_string[cmd], bank);
default : $display ("%m: at time %t ERROR: %s %d Illegal Partial Array Self Refresh = %d", $time, cmd_string[cmd], bank, pasr);
endcase
end
else
if (addr[2:0] !== 0 && check_strict_mrbits) begin
$display ("%m: at time %t ERROR: %s %d Illegal value. Reserved address bits must be programmed to zero", $time, cmd_string[cmd], bank);
end
// CAS Write Latency
cas_write_latency = addr[5:3]+5;
set_latency;
if ((cas_write_latency >= CWL_MIN) && (cas_write_latency <= CWL_MAX)) begin
if (DEBUG) $display ("%m: at time %t INFO: %s %d CAS Write Latency = %d", $time, cmd_string[cmd], bank, cas_write_latency);
end else begin
$display ("%m: at time %t ERROR: %s %d Illegal CAS Write Latency = %d", $time, cmd_string[cmd], bank, cas_write_latency);
end
// Auto Self Refresh Method
asr = addr[6];
if (!asr) begin
if (DEBUG) $display ("%m: at time %t INFO: %s %d Auto Self Refresh = Disabled", $time, cmd_string[cmd], bank);
end else if (asr) begin
if (DEBUG) $display ("%m: at time %t INFO: %s %d Auto Self Refresh = Enabled", $time, cmd_string[cmd], bank);
if (check_strict_mrbits) $display ("%m: at time %t WARNING: %s %d Auto Self Refresh is not modeled", $time, cmd_string[cmd], bank);
end else begin
$display ("%m: at time %t ERROR: %s %d Illegal Auto Self Refresh = %d", $time, cmd_string[cmd], bank, asr);
end
// Self Refresh Temperature
srt = addr[7];
if (!srt) begin
if (DEBUG) $display ("%m: at time %t INFO: %s %d Self Refresh Temperature = Normal", $time, cmd_string[cmd], bank);
end else if (srt) begin
if (DEBUG) $display ("%m: at time %t INFO: %s %d Self Refresh Temperature = Extended", $time, cmd_string[cmd], bank);
if (check_strict_mrbits) $display ("%m: at time %t WARNING: %s %d Self Refresh Temperature is not modeled", $time, cmd_string[cmd], bank);
end else begin
$display ("%m: at time %t ERROR: %s %d Illegal Self Refresh Temperature = %d", $time, cmd_string[cmd], bank, srt);
end
if (asr && srt)
$display ("%m: at time %t ERROR: %s %d SRT must be set to 0 when ASR is enabled.", $time, cmd_string[cmd], bank);
// Reserved
if (addr[8] !== 0 && check_strict_mrbits) begin
$display ("%m: at time %t ERROR: %s %d Illegal value. Reserved address bits must be programmed to zero", $time, cmd_string[cmd], bank);
end
// Dynamic ODT (Rtt_WR)
odt_rtt_wr = addr[10:9];
if (odt_rtt_wr == 2'b00) begin
if (DEBUG) $display ("%m: at time %t INFO: %s %d Dynamic ODT = Disabled", $time, cmd_string[cmd], bank);
dyn_odt_en = 0;
end else if ((odt_rtt_wr > 0) && (odt_rtt_wr < 3)) begin
if (DEBUG) $display ("%m: at time %t INFO: %s %d Dynamic ODT Rtt = %d Ohm", $time, cmd_string[cmd], bank, get_rtt_wr(odt_rtt_wr));
dyn_odt_en = 1;
end else begin
$display ("%m: at time %t ERROR: %s %d Illegal Dynamic ODT = %d", $time, cmd_string[cmd], bank, odt_rtt_wr);
dyn_odt_en = 0;
end
// Reserved
if (ADDR_BITS>13 && addr[13:11] !== 0 && check_strict_mrbits) begin
$display ("%m: at time %t ERROR: %s %d Illegal value. Reserved address bits must be programmed to zero", $time, cmd_string[cmd], bank);
end
end
3 : begin
mpr_select = addr[1:0];
// MultiPurpose Register Select
if (mpr_select == 2'b00) begin
if (DEBUG) $display ("%m: at time %t INFO: %s %d MultiPurpose Register Select = Pre-defined pattern", $time, cmd_string[cmd], bank);
end else begin
if (check_strict_mrbits) $display ("%m: at time %t ERROR: %s %d Illegal MultiPurpose Register Select = %d", $time, cmd_string[cmd], bank, mpr_select);
end
// MultiPurpose Register Enable
mpr_en = addr[2];
if (!mpr_en) begin
if (DEBUG) $display ("%m: at time %t INFO: %s %d MultiPurpose Register Enable = Disabled", $time, cmd_string[cmd], bank);
end else if (mpr_en) begin
if (DEBUG) $display ("%m: at time %t INFO: %s %d MultiPurpose Register Enable = Enabled", $time, cmd_string[cmd], bank);
end else begin
$display ("%m: at time %t ERROR: %s %d Illegal MultiPurpose Register Enable = %d", $time, cmd_string[cmd], bank, mpr_en);
end
if (feature_truebl4 && (addr[11] == 1'b1)) begin
if (addr[11] == 1'b1) begin
truebl4 = 1;
$display(" EMRS3 Set True Bl4 mode only ");
end
end
// Reserved
if (ADDR_BITS>13 && addr[13:3] !== 0 && check_strict_mrbits) begin
$display ("%m: at time %t ERROR: %s %d Illegal value. Reserved address bits must be programmed to zero", $time, cmd_string[cmd], bank);
end
end
endcase
if (dyn_odt_en && write_levelization)
$display ("%m: at time %t ERROR: Dynamic ODT is not available during Write Leveling mode.", $time);
init_mode_reg[bank] = 1;
mode_reg[bank] = addr;
// dll_reset bit self clear
if(bank==0 && addr[8]==1'b1)
mode_reg[0][8] <= #($rtoi(tck_avg)) 1'b0;
tm_load_mode <= $time;
ck_load_mode <= ck_cntr;
end
end
REFRESH : begin
if (mpr_en) begin
$display ("%m: at time %t ERROR: %s Failure. Multipurpose Register must be disabled.", $time, cmd_string[cmd]);
if (STOP_ON_ERROR) $stop(0);
end else if (|active_bank) begin
$display ("%m: at time %t ERROR: %s Failure. All banks must be Precharged.", $time, cmd_string[cmd]);
if (STOP_ON_ERROR) $stop(0);
end else begin
if (DEBUG) $display ("%m: at time %t INFO: %s", $time, cmd_string[cmd]);
er_trfc_max = 0;
ref_cntr = ref_cntr + 1;
tm_refresh <= $time;
ck_refresh <= ck_cntr;
end
end
PRECHARGE : begin
if (addr[AP]) begin
if (DEBUG) $display ("%m: at time %t INFO: %s All", $time, cmd_string[cmd]);
end
// PRECHARGE command will be treated as a NOP if there is no open row in that bank (idle state),
// or if the previously open row is already in the process of precharging
if (|active_bank) begin
if (($time - tm_txpr < TXPR) || (ck_cntr - ck_txpr < TXPR_TCK))
$display ("%m: at time %t ERROR: tXPR violation during %s", $time, cmd_string[cmd]);
if (mpr_en) begin
$display ("%m: at time %t ERROR: %s Failure. Multipurpose Register must be disabled.", $time, cmd_string[cmd]);
if (STOP_ON_ERROR) $stop(0);
end else begin
for (i=0; i<`BANKS; i=i+1) begin
if (active_bank[i]) begin
if (addr[AP] || (i == bank)) begin
for (j=0; j<=SELF_REF; j=j+1) begin
chk_err(SAME_BANK, i, j, cmd);
chk_err(DIFF_BANK, i, j, cmd);
end
if (auto_precharge_bank[i]) begin
$display ("%m: at time %t ERROR: %s Failure. Auto Precharge is scheduled to bank %d.", $time, cmd_string[cmd], i);
if (STOP_ON_ERROR) $stop(0);
end else begin
if (DEBUG) $display ("%m: at time %t INFO: %s bank %d", $time, cmd_string[cmd], i);
active_bank[i] = 1'b0;
tm_bank_precharge[i] <= $time;
tm_precharge <= $time;
ck_precharge <= ck_cntr;
end
end
end
end
end
end // if (|active_bank)
else begin
chk_err(DIFF_BANK, 0, REFRESH, PRECHARGE);
end
end
ACTIVATE : begin
tfaw_cntr = 0;
for (i=0; i<`BANKS; i=i+1) begin
if ($time - tm_bank_activate[i] < TFAW) begin
tfaw_cntr = tfaw_cntr + 1;
end
end
if (tfaw_cntr > 3) begin
$display ("%m: at time %t ERROR: tFAW violation during %s to bank %d", $time, cmd_string[cmd], bank);
end
if (mpr_en) begin
$display ("%m: at time %t ERROR: %s Failure. Multipurpose Register must be disabled.", $time, cmd_string[cmd]);
if (STOP_ON_ERROR) $stop(0);
end else if (!init_done) begin
$display ("%m: at time %t ERROR: %s Failure. Initialization sequence is not complete.", $time, cmd_string[cmd]);
if (STOP_ON_ERROR) $stop(0);
end else if (active_bank[bank]) begin
$display ("%m: at time %t ERROR: %s Failure. Bank %d must be Precharged.", $time, cmd_string[cmd], bank);
if (STOP_ON_ERROR) $stop(0);
end else begin
if (addr >= 1<<ROW_BITS) begin
$display ("%m: at time %t WARNING: row = %h does not exist. Maximum row = %h", $time, addr, (1<<ROW_BITS)-1);
end
if (DEBUG) $display ("%m: at time %t INFO: %s bank %d row %h", $time, cmd_string[cmd], bank, addr);
active_bank[bank] = 1'b1;
active_row[bank] = addr;
tm_group_activate[bank[1]] <= $time;
tm_activate <= $time;
tm_bank_activate[bank] <= $time;
ck_group_activate[bank[1]] <= ck_cntr;
ck_activate <= ck_cntr;
end
end
WRITE : begin
if ((!rd_bc && blotf) || (burst_length == 4)) begin // BL=4
if (truebl4) begin
if (ck_cntr - ck_group_read[bank[1]] < read_latency + TCCD/2 + 2 - write_latency)
$display ("%m: at time %t ERROR: tRTW violation during %s to bank %d", $time, cmd_string[cmd], bank);
if (ck_cntr - ck_read < read_latency + TCCD_DG/2 + 2 - write_latency)
$display ("%m: at time %t ERROR: tRTW_DG violation during %s to bank %d", $time, cmd_string[cmd], bank);
end else begin
if (ck_cntr - ck_read < read_latency + TCCD/2 + 2 - write_latency)
$display ("%m: at time %t ERROR: tRTW violation during %s to bank %d", $time, cmd_string[cmd], bank);
end
end else begin // BL=8
if (ck_cntr - ck_read < read_latency + TCCD + 2 - write_latency)
$display ("%m: at time %t ERROR: tRTW violation during %s to bank %d", $time, cmd_string[cmd], bank);
end
if (mpr_en) begin
$display ("%m: at time %t ERROR: %s Failure. Multipurpose Register must be disabled.", $time, cmd_string[cmd]);
if (STOP_ON_ERROR) $stop(0);
end else if (!init_done) begin
$display ("%m: at time %t ERROR: %s Failure. Initialization sequence is not complete.", $time, cmd_string[cmd]);
if (STOP_ON_ERROR) $stop(0);
end else if (!active_bank[bank]) begin
if (check_strict_timing) $display ("%m: at time %t ERROR: %s Failure. Bank %d must be Activated.", $time, cmd_string[cmd], bank);
if (STOP_ON_ERROR) $stop(0);
end else if (auto_precharge_bank[bank]) begin
$display ("%m: at time %t ERROR: %s Failure. Auto Precharge is scheduled to bank %d.", $time, cmd_string[cmd], bank);
if (STOP_ON_ERROR) $stop(0);
end else if ((ck_cntr - ck_write < burst_length/2) && (truebl4 == 0)) begin
$display ("%m: at time %t ERROR: %s Failure. Illegal burst interruption.", $time, cmd_string[cmd]);
if (STOP_ON_ERROR) $stop(0);
end else begin
if (addr[AP]) begin
auto_precharge_bank[bank] = 1'b1;
write_precharge_bank[bank] = 1'b1;
end
`ifdef CA14PLUS
col = {addr[COL_BITS-1:BC+1], addr[BC-1:AP+1], addr[AP-1:0]}; // assume BC > AP
`else
col = {addr[BC-1:AP+1], addr[AP-1:0]}; // assume BC > AP
`endif
if (col >= 1<<COL_BITS) begin
$display ("%m: at time %t WARNING: col = %h does not exist. Maximum col = %h", $time, col, (1<<COL_BITS)-1);
end
if ((!addr[BC] && blotf) || (burst_length == 4)) begin // BL=4
col = col & -4;
end else begin // BL=8
col = col & -8;
end
if (DEBUG) $display ("%m: at time %t INFO: %s bank %d col %h, auto precharge %d", $time, cmd_string[cmd], bank, col, addr[AP]);
wr_pipeline[2*write_latency + 1] = 1;
ba_pipeline[2*write_latency + 1] = bank;
row_pipeline[2*write_latency + 1] = active_row[bank];
col_pipeline[2*write_latency + 1] = col;
if ((!addr[BC] && blotf) || (burst_length == 4)) begin // BL=4
bl_pipeline[2*write_latency + 1] = 4;
if (mpr_en && col%4) begin
$display ("%m: at time %t WARNING: col[1:0] must be set to 2'b00 during a BL4 Multipurpose Register read", $time);
end
end else begin // BL=8
bl_pipeline[2*write_latency + 1] = 8;
if (odt_in) begin
ck_odth8 <= ck_cntr;
end
end
for (j=0; j<(bl_pipeline[2*write_latency + 1] + 4); j=j+1) begin
dyn_odt_pipeline[2*(write_latency - 2) + j] = 1'b1; // ODTLcnw = WL - 2, ODTLcwn = BL/2 + 2
end
ck_bank_write[bank] <= ck_cntr;
ck_group_write[bank[1]] <= ck_cntr;
ck_write <= ck_cntr;
end
end
READ : begin
if (!dll_locked)
$display ("%m: at time %t WARNING: tDLLK violation during %s.", $time, cmd_string[cmd]);
if (mpr_en && (addr[1:0] != 2'b00)) begin
$display ("%m: at time %t ERROR: %s Failure. addr[1:0] must be zero during Multipurpose Register Read.", $time, cmd_string[cmd]);
if (STOP_ON_ERROR) $stop(0);
end else if (!init_done) begin
$display ("%m: at time %t ERROR: %s Failure. Initialization sequence is not complete.", $time, cmd_string[cmd]);
if (STOP_ON_ERROR) $stop(0);
end else if (!active_bank[bank] && !mpr_en) begin
if (check_strict_timing) $display ("%m: at time %t ERROR: %s Failure. Bank %d must be Activated.", $time, cmd_string[cmd], bank);
if (STOP_ON_ERROR) $stop(0);
end else if (auto_precharge_bank[bank]) begin
$display ("%m: at time %t ERROR: %s Failure. Auto Precharge is scheduled to bank %d.", $time, cmd_string[cmd], bank);
if (STOP_ON_ERROR) $stop(0);
end else if ((ck_cntr - ck_read < burst_length/2) && (truebl4 == 0)) begin
$display ("%m: at time %t ERROR: %s Failure. Illegal burst interruption.", $time, cmd_string[cmd]);
if (STOP_ON_ERROR) $stop(0);
end else begin
if (addr[AP] && !mpr_en) begin
auto_precharge_bank[bank] = 1'b1;
read_precharge_bank[bank] = 1'b1;
end
`ifdef CA14PLUS
col = {addr[COL_BITS-1:BC+1], addr[BC-1:AP+1], addr[AP-1:0]}; // assume BC > AP
`else
col = {addr[BC-1:AP+1], addr[AP-1:0]}; // assume BC > AP
`endif
if (col >= 1<<COL_BITS) begin
$display ("%m: at time %t WARNING: col = %h does not exist. Maximum col = %h", $time, col, (1<<COL_BITS)-1);
end
if (DEBUG) $display ("%m: at time %t INFO: %s bank %d col %h, auto precharge %d", $time, cmd_string[cmd], bank, col, addr[AP]);
rd_pipeline[2*read_latency - 1] = 1;
ba_pipeline[2*read_latency - 1] = bank;
row_pipeline[2*read_latency - 1] = active_row[bank];
col_pipeline[2*read_latency - 1] = col;
if ((!addr[BC] && blotf) || (burst_length == 4)) begin // BL=4
bl_pipeline[2*read_latency - 1] = 4;
if (mpr_en && col%4) begin
$display ("%m: at time %t WARNING: col[1:0] must be set to 2'b00 during a BL4 Multipurpose Register read", $time);
end
end else begin // BL=8
bl_pipeline[2*read_latency - 1] = 8;
if (mpr_en && col%8) begin
$display ("%m: at time %t WARNING: col[2:0] must be set to 3'b000 during a BL8 Multipurpose Register read", $time);
end
end
rd_bc = addr[BC];
ck_bank_read[bank] <= ck_cntr;
ck_group_read[bank[1]] <= ck_cntr;
ck_read <= ck_cntr;
end
end
ZQ : begin
if (mpr_en) begin
$display ("%m: at time %t ERROR: %s Failure. Multipurpose Register must be disabled.", $time, cmd_string[cmd]);
if (STOP_ON_ERROR) $stop(0);
end else if (|active_bank) begin
$display ("%m: at time %t ERROR: %s Failure. All banks must be Precharged.", $time, cmd_string[cmd]);
if (STOP_ON_ERROR) $stop(0);
end else begin
if (DEBUG) $display ("%m: at time %t INFO: %s long = %d", $time, cmd_string[cmd], addr[AP]);
if (addr[AP]) begin
zq_set = 1;
if (init_done) begin
ck_zqoper <= ck_cntr;
end else begin
ck_zqinit <= ck_cntr;
end
end else begin
ck_zqcs <= ck_cntr;
end
end
end
NOP: begin
if (in_power_down) begin
if (($time - tm_freq_change < TCKSRX) || (ck_cntr - ck_freq_change < TCKSRX_TCK))
$display ("%m: at time %t ERROR: tCKSRX violation during Power Down Exit", $time);
if ($time - tm_cke_cmd > TPD_MAX)
$display ("%m: at time %t ERROR: tPD maximum violation during Power Down Exit", $time);
if (DEBUG) $display ("%m: at time %t INFO: Power Down Exit", $time);
in_power_down = 0;
if ((active_bank == 0) && low_power) begin // precharge power down with dll off
if (ck_cntr - ck_odt < write_latency - 1)
$display ("%m: at time %t WARNING: tANPD violation during Power Down Exit. Synchronous or asynchronous change in termination resistance is possible.", $time);
tm_slow_exit_pd <= $time;
ck_slow_exit_pd <= ck_cntr;
end
tm_power_down <= $time;
ck_power_down <= ck_cntr;
end
if (in_self_refresh) begin
if (($time - tm_freq_change < TCKSRX) || (ck_cntr - ck_freq_change < TCKSRX_TCK))
$display ("%m: at time %t ERROR: tCKSRX violation during Self Refresh Exit", $time);
if (ck_cntr - ck_cke_cmd < TCKESR_TCK)
$display ("%m: at time %t ERROR: tCKESR violation during Self Refresh Exit", $time);
if ($time - tm_cke < TISXR)
$display ("%m: at time %t ERROR: tISXR violation during Self Refresh Exit", $time);
if (DEBUG) $display ("%m: at time %t INFO: Self Refresh Exit", $time);
in_self_refresh = 0;
ck_dll_reset <= ck_cntr;
ck_self_refresh <= ck_cntr;
tm_self_refresh <= $time;
tm_refresh <= $time;
end
end
endcase
if ((prev_cke !== 1) && (cmd !== NOP)) begin
$display ("%m: at time %t ERROR: NOP or Deselect is required when CKE goes active.", $time);
end
if (!init_done) begin
case (init_step)
0 : begin
if ($time - tm_rst_n < 500000000 && check_strict_timing)
$display ("%m at time %t WARNING: 500 us is required after RST_N goes inactive before CKE goes active.", $time);
tm_txpr <= $time;
ck_txpr <= ck_cntr;
init_step = init_step + 1;
end
1 : begin
if (dll_en) init_step = init_step + 1;
end
2 : begin
if (&init_mode_reg && init_dll_reset && zq_set) begin
if (DEBUG) $display ("%m: at time %t INFO: Initialization Sequence is complete", $time);
init_done = 1;
end
end
endcase
end
end else if (prev_cke) begin
if ((!init_done) && (init_step > 1)) begin
$display ("%m: at time %t ERROR: CKE must remain active until the initialization sequence is complete.", $time);
if (STOP_ON_ERROR) $stop(0);
end
case (cmd)
REFRESH : begin
if ($time - tm_txpr < TXPR)
$display ("%m: at time %t ERROR: tXPR violation during %s", $time, cmd_string[SELF_REF]);
for (j=0; j<=SELF_REF; j=j+1) begin
chk_err(DIFF_BANK, bank, j, SELF_REF);
end
if (mpr_en) begin
$display ("%m: at time %t ERROR: Self Refresh Failure. Multipurpose Register must be disabled.", $time);
if (STOP_ON_ERROR) $stop(0);
end else if (|active_bank) begin
$display ("%m: at time %t ERROR: Self Refresh Failure. All banks must be Precharged.", $time);
if (STOP_ON_ERROR) $stop(0);
end else if (odt_state) begin
$display ("%m: at time %t ERROR: Self Refresh Failure. ODT must be off prior to entering Self Refresh", $time);
if (STOP_ON_ERROR) $stop(0);
end else if (!init_done) begin
$display ("%m: at time %t ERROR: Self Refresh Failure. Initialization sequence is not complete.", $time);
if (STOP_ON_ERROR) $stop(0);
end else begin
if (DEBUG) $display ("%m: at time %t INFO: Self Refresh Enter", $time);
if (feature_pasr)
// Partial Array Self Refresh
case (pasr)
3'b000 : ;//keep Bank 0-7
3'b001 : begin if (DEBUG) $display("%m: at time %t INFO: Banks 4-7 will be lost due to Partial Array Self Refresh", $time); erase_banks(8'hF0); end
3'b010 : begin if (DEBUG) $display("%m: at time %t INFO: Banks 2-7 will be lost due to Partial Array Self Refresh", $time); erase_banks(8'hFC); end
3'b011 : begin if (DEBUG) $display("%m: at time %t INFO: Banks 1-7 will be lost due to Partial Array Self Refresh", $time); erase_banks(8'hFE); end
3'b100 : begin if (DEBUG) $display("%m: at time %t INFO: Banks 0-1 will be lost due to Partial Array Self Refresh", $time); erase_banks(8'h03); end
3'b101 : begin if (DEBUG) $display("%m: at time %t INFO: Banks 0-3 will be lost due to Partial Array Self Refresh", $time); erase_banks(8'h0F); end
3'b110 : begin if (DEBUG) $display("%m: at time %t INFO: Banks 0-5 will be lost due to Partial Array Self Refresh", $time); erase_banks(8'h3F); end
3'b111 : begin if (DEBUG) $display("%m: at time %t INFO: Banks 0-6 will be lost due to Partial Array Self Refresh", $time); erase_banks(8'h7F); end
endcase
in_self_refresh = 1;
dll_locked = 0;
end
end
NOP : begin
// entering precharge power down with dll off and tANPD has not been satisfied
if (low_power && (active_bank == 0) && |odt_pipeline)
$display ("%m: at time %t WARNING: tANPD violation during %s. Synchronous or asynchronous change in termination resistance is possible.", $time, cmd_string[PWR_DOWN]);
if ($time - tm_txpr < TXPR)
$display ("%m: at time %t ERROR: tXPR violation during %s", $time, cmd_string[PWR_DOWN]);
for (j=0; j<=SELF_REF; j=j+1) begin
chk_err(DIFF_BANK, bank, j, PWR_DOWN);
end
if (mpr_en) begin
$display ("%m: at time %t ERROR: Power Down Failure. Multipurpose Register must be disabled.", $time);
if (STOP_ON_ERROR) $stop(0);
end else if (!init_done) begin
$display ("%m: at time %t ERROR: Power Down Failure. Initialization sequence is not complete.", $time);
if (STOP_ON_ERROR) $stop(0);
end else begin
if (DEBUG) begin
if (|active_bank) begin
$display ("%m: at time %t INFO: Active Power Down Enter", $time);
end else begin
$display ("%m: at time %t INFO: Precharge Power Down Enter", $time);
end
end
in_power_down = 1;
end
end
default : begin
$display ("%m: at time %t ERROR: NOP, Deselect, or Refresh is required when CKE goes inactive.", $time);
end
endcase
end else if (in_self_refresh || in_power_down) begin
if ((ck_cntr - ck_cke_cmd <= TCPDED) && (cmd !== NOP))
$display ("%m: at time %t ERROR: tCPDED violation during Power Down or Self Refresh Entry. NOP or Deselect is required.", $time);
end
prev_cke = cke;
end
endtask
task data_task;
reg [BA_BITS-1:0] bank;
reg [ROW_BITS-1:0] row;
reg [COL_BITS-1:0] col;
integer i;
integer j;
begin
if (diff_ck) begin
for (i=0; i<64; i=i+1) begin
if (dq_in_valid && dll_locked && ($time - tm_dqs_neg[i] < $rtoi(TDSS*tck_avg)))
$display ("%m: at time %t ERROR: tDSS violation on %s bit %d", $time, dqs_string[i/32], i%32);
if (check_write_dqs_high[i])
$display ("%m: at time %t ERROR: %s bit %d latching edge required during the preceding clock period.", $time, dqs_string[i/32], i%32);
end
check_write_dqs_high <= 0;
end else begin
for (i=0; i<64; i=i+1) begin
if (dll_locked && dq_in_valid) begin
tm_tdqss = abs_value(1.0*tm_ck_pos - tm_dqss_pos[i]);
if ((tm_tdqss < tck_avg/2.0) && (tm_tdqss > TDQSS*tck_avg))
$display ("%m: at time %t ERROR: tDQSS violation on %s bit %d", $time, dqs_string[i/32], i%32);
end
if (check_write_dqs_low[i])
$display ("%m: at time %t ERROR: %s bit %d latching edge required during the preceding clock period", $time, dqs_string[i/32], i%32);
end
check_write_preamble <= 0;
check_write_postamble <= 0;
check_write_dqs_low <= 0;
end
if (wr_pipeline[0] || rd_pipeline[0]) begin
bank = ba_pipeline[0];
row = row_pipeline[0];
col = col_pipeline[0];
burst_cntr = 0;
memory_read(bank, row, col, memory_data);
end
// burst counter
if (burst_cntr < burst_length) begin
burst_position = col ^ burst_cntr;
if (!burst_order) begin
burst_position[BO_BITS-1:0] = col + burst_cntr;
end
burst_cntr = burst_cntr + 1;
end
// write dqs counter
if (wr_pipeline[WDQS_PRE + 1]) begin
wdqs_cntr = WDQS_PRE + bl_pipeline[WDQS_PRE + 1] + WDQS_PST - 1;
end
// write dqs
if ((wr_pipeline[2]) && (wdq_cntr == 0)) begin //write preamble
check_write_preamble <= ({DQS_BITS{1'b1}}<<32) | {DQS_BITS{1'b1}};
end
if (wdqs_cntr > 1) begin // write data
if ((wdqs_cntr - WDQS_PST)%2) begin
check_write_dqs_high <= ({DQS_BITS{1'b1}}<<32) | {DQS_BITS{1'b1}};
end else begin
check_write_dqs_low <= ({DQS_BITS{1'b1}}<<32) | {DQS_BITS{1'b1}};
end
end
if (wdqs_cntr == WDQS_PST) begin // write postamble
check_write_postamble <= ({DQS_BITS{1'b1}}<<32) | {DQS_BITS{1'b1}};
end
if (wdqs_cntr > 0) begin
wdqs_cntr = wdqs_cntr - 1;
end
// write dq
if (dq_in_valid) begin // write data
bit_mask = 0;
if (diff_ck) begin
for (i=0; i<DM_BITS; i=i+1) begin
bit_mask = bit_mask | ({`DQ_PER_DQS{~dm_in_neg[i]}}<<(burst_position*DQ_BITS + i*`DQ_PER_DQS));
end
memory_data = (dq_in_neg<<(burst_position*DQ_BITS) & bit_mask) | (memory_data & ~bit_mask);
end else begin
for (i=0; i<DM_BITS; i=i+1) begin
bit_mask = bit_mask | ({`DQ_PER_DQS{~dm_in_pos[i]}}<<(burst_position*DQ_BITS + i*`DQ_PER_DQS));
end
memory_data = (dq_in_pos<<(burst_position*DQ_BITS) & bit_mask) | (memory_data & ~bit_mask);
end
dq_temp = memory_data>>(burst_position*DQ_BITS);
if (DEBUG) $display ("%m: at time %t INFO: WRITE @ DQS= bank = %h row = %h col = %h data = %h",$time, bank, row, (-1*BL_MAX & col) + burst_position, dq_temp);
if (burst_cntr%BL_MIN == 0) begin
memory_write(bank, row, col, memory_data);
end
end
if (wr_pipeline[1]) begin
wdq_cntr = bl_pipeline[1];
end
if (wdq_cntr > 0) begin
wdq_cntr = wdq_cntr - 1;
dq_in_valid = 1'b1;
end else begin
dq_in_valid = 1'b0;
dqs_in_valid <= 1'b0;
for (i=0; i<63; i=i+1) begin
wdqs_pos_cntr[i] <= 0;
end
end
if (wr_pipeline[0]) begin
b2b_write <= 1'b0;
end
if (wr_pipeline[2]) begin
if (dqs_in_valid) begin
b2b_write <= 1'b1;
end
dqs_in_valid <= 1'b1;
wr_burst_length = bl_pipeline[2];
end
// read dqs enable counter
if (rd_pipeline[RDQSEN_PRE]) begin
rdqsen_cntr = RDQSEN_PRE + bl_pipeline[RDQSEN_PRE] + RDQSEN_PST - 1;
end
if (rdqsen_cntr > 0) begin
rdqsen_cntr = rdqsen_cntr - 1;
dqs_out_en = 1'b1;
end else begin
dqs_out_en = 1'b0;
end
// read dqs counter
if (rd_pipeline[RDQS_PRE]) begin
rdqs_cntr = RDQS_PRE + bl_pipeline[RDQS_PRE] + RDQS_PST - 1;
end
// read dqs
if (((rd_pipeline>>1 & {RDQS_PRE{1'b1}}) > 0) && (rdq_cntr == 0)) begin //read preamble
dqs_out = 1'b0;
end else if (rdqs_cntr > RDQS_PST) begin // read data
dqs_out = rdqs_cntr - RDQS_PST;
end else if (rdqs_cntr > 0) begin // read postamble
dqs_out = 1'b0;
end else begin
dqs_out = 1'b1;
end
if (rdqs_cntr > 0) begin
rdqs_cntr = rdqs_cntr - 1;
end
// read dq enable counter
if (rd_pipeline[RDQEN_PRE]) begin
rdqen_cntr = RDQEN_PRE + bl_pipeline[RDQEN_PRE] + RDQEN_PST;
end
if (rdqen_cntr > 0) begin
rdqen_cntr = rdqen_cntr - 1;
dq_out_en = 1'b1;
end else begin
dq_out_en = 1'b0;
end
// read dq
if (rd_pipeline[0]) begin
rdq_cntr = bl_pipeline[0];
end
if (rdq_cntr > 0) begin // read data
if (mpr_en) begin
`ifdef MPR_DQ0 // DQ0 output MPR data, other DQ low
if (mpr_select == 2'b00) begin // Calibration Pattern
dq_temp = {DQS_BITS{{`DQ_PER_DQS-1{1'b0}}, calibration_pattern[burst_position]}};
end else if (odts_readout && (mpr_select == 2'b11)) begin // Temp Sensor (ODTS)
dq_temp = {DQS_BITS{{`DQ_PER_DQS-1{1'b0}}, temp_sensor[burst_position]}};
end else begin // Reserved
dq_temp = {DQS_BITS{{`DQ_PER_DQS-1{1'b0}}, 1'bx}};
end
`else // all DQ output MPR data
if (mpr_select == 2'b00) begin // Calibration Pattern
dq_temp = {DQS_BITS{{`DQ_PER_DQS{calibration_pattern[burst_position]}}}};
end else if (odts_readout && (mpr_select == 2'b11)) begin // Temp Sensor (ODTS)
dq_temp = {DQS_BITS{{`DQ_PER_DQS{temp_sensor[burst_position]}}}};
end else begin // Reserved
dq_temp = {DQS_BITS{{`DQ_PER_DQS{1'bx}}}};
end
`endif
if (DEBUG) $display ("%m: at time %t READ @ DQS MultiPurpose Register %d, col = %d, data = %b", $time, mpr_select, burst_position, dq_temp[0]);
end else begin
dq_temp = memory_data>>(burst_position*DQ_BITS);
if (DEBUG) $display ("%m: at time %t INFO: READ @ DQS= bank = %h row = %h col = %h data = %h",$time, bank, row, (-1*BL_MAX & col) + burst_position, dq_temp);
end
dq_out = dq_temp;
rdq_cntr = rdq_cntr - 1;
end else begin
dq_out = {DQ_BITS{1'b1}};
end
// delay signals prior to output
if (RANDOM_OUT_DELAY && (dqs_out_en || (|dqs_out_en_dly) || dq_out_en || (|dq_out_en_dly))) begin
for (i=0; i<DQS_BITS; i=i+1) begin
// DQSCK requirements
// 1.) less than tDQSCK
// 2.) greater than -tDQSCK
// 3.) cannot change more than tQH + tDQSQ from previous DQS edge
dqsck_max = TDQSCK;
if (dqsck_max > dqsck[i] + TQH*tck_avg + TDQSQ) begin
dqsck_max = dqsck[i] + TQH*tck_avg + TDQSQ;
end
dqsck_min = -1*TDQSCK;
if (dqsck_min < dqsck[i] - TQH*tck_avg - TDQSQ) begin
dqsck_min = dqsck[i] - TQH*tck_avg - TDQSQ;
end
// DQSQ requirements
// 1.) less than tDQSQ
// 2.) greater than 0
// 3.) greater than tQH from the previous DQS edge
dqsq_min = 0;
if (dqsq_min < dqsck[i] - TQH*tck_avg) begin
dqsq_min = dqsck[i] - TQH*tck_avg;
end
if (dqsck_min == dqsck_max) begin
dqsck[i] = dqsck_min;
end else begin
dqsck[i] = $dist_uniform(seed, dqsck_min, dqsck_max);
end
dqsq_max = TDQSQ + dqsck[i];
dqs_out_en_dly[i] <= #(tck_avg/2) dqs_out_en;
dqs_out_dly[i] <= #(tck_avg/2 + dqsck[i]) dqs_out;
if (!write_levelization) begin
for (j=0; j<`DQ_PER_DQS; j=j+1) begin
dq_out_en_dly[i*`DQ_PER_DQS + j] <= #(tck_avg/2) dq_out_en;
if (dqsq_min == dqsq_max) begin
dq_out_dly [i*`DQ_PER_DQS + j] <= #(tck_avg/2 + dqsq_min) dq_out[i*`DQ_PER_DQS + j];
end else begin
dq_out_dly [i*`DQ_PER_DQS + j] <= #(tck_avg/2 + $dist_uniform(seed, dqsq_min, dqsq_max)) dq_out[i*`DQ_PER_DQS + j];
end
end
end
end
end else begin
if (dll_en)
if(diff_ck)
out_delay = ($rtoi(tch_avg) > 50000) ? 0 : $rtoi(tch_avg);
else
out_delay = ($rtoi(tcl_avg) > 50000) ? 0 : $rtoi(tcl_avg);
else
if(diff_ck)
out_delay = ($rtoi(tch_avg) > 50000) ? 0 : $rtoi(tch_avg) + TDQSCK_DLLDIS;
else
out_delay = ($rtoi(tcl_avg) > 50000) ? 0 : $rtoi(tcl_avg) + TDQSCK_DLLDIS;
dqs_out_en_dly <= #(out_delay) {DQS_BITS{dqs_out_en}};
dqs_out_dly <= #(out_delay) {DQS_BITS{dqs_out }};
if (write_levelization !== 1'b1) begin
dq_out_en_dly <= #(out_delay) {DQ_BITS {dq_out_en }};
dq_out_dly <= #(out_delay) {DQ_BITS {dq_out }};
end
end
end
endtask
always @ (posedge rst_n_in) begin : reset
integer i;
if (rst_n_in) begin
if ($time < 200000000 && check_strict_timing)
$display ("%m at time %t WARNING: 200 us is required before RST_N goes inactive.", $time);
if (cke_in !== 1'b0)
$display ("%m: at time %t ERROR: CKE must be inactive when RST_N goes inactive.", $time);
if ($time - tm_cke < 10000)
$display ("%m: at time %t ERROR: CKE must be maintained inactive for 10 ns before RST_N goes inactive.", $time);
// clear memory
`ifdef MAX_MEM
// verification group does not erase memory
// for (banki = 0; banki < `BANKS; banki = banki + 1) begin
// $fclose(memfd[banki]);
// memfd[banki] = open_bank_file(banki);
// end
`else
memory_used <= 0; //erase memory
`endif
end
end
always @(negedge rst_n_in or posedge diff_ck or negedge diff_ck) begin : main
integer i;
if (!rst_n_in) begin
reset_task;
end else begin
if (!in_self_refresh && (diff_ck !== 1'b0) && (diff_ck !== 1'b1))
$display ("%m: at time %t ERROR: CK and CK_N are not allowed to go to an unknown state.", $time);
data_task;
// Clock Frequency Change is legal:
// 1.) During Self Refresh
// 2.) During Precharge Power Down (DLL on or off)
if (in_self_refresh || (in_power_down && (active_bank == 0))) begin
if (diff_ck) begin
tjit_per_rtime = $time - tm_ck_pos - tck_avg;
end else begin
tjit_per_rtime = $time - tm_ck_neg - tck_avg;
end
if (dll_locked && (abs_value(tjit_per_rtime) > TJIT_PER)) begin
if ((tm_ck_pos - tm_cke_cmd < TCKSRE) || (ck_cntr - ck_cke_cmd < TCKSRE_TCK))
$display ("%m: at time %t ERROR: tCKSRE violation during Self Refresh or Precharge Power Down Entry", $time);
if (odt_state) begin
$display ("%m: at time %t ERROR: Clock Frequency Change Failure. ODT must be off prior to Clock Frequency Change.", $time);
if (STOP_ON_ERROR) $stop(0);
end else begin
if (DEBUG) $display ("%m: at time %t INFO: Clock Frequency Change detected. DLL Reset is Required.", $time);
tm_freq_change <= $time;
ck_freq_change <= ck_cntr;
dll_locked = 0;
end
end
end
if (diff_ck) begin
// check setup of command signals
if ($time > TIS) begin
if ($time - tm_cke < TIS)
$display ("%m: at time %t ERROR: tIS violation on CKE by %t", $time, tm_cke + TIS - $time);
if (cke_in) begin
for (i=0; i<3; i=i+1) begin
if ($time - tm_cmd_addr[i] < TIS)
$display ("%m: at time %t ERROR: tIS violation on %s by %t", $time, cmd_addr_string[i], tm_cmd_addr[i] + TIS - $time);
end
end
if (cke_in & !(cs_n_in | (ras_n_in & cas_n_in & we_n_in))) begin // Bank and Address are don't care when DES or NOP
for (i=4; i<23; i=i+1) begin
if ($time - tm_cmd_addr[i] < TIS)
$display ("%m: at time %t ERROR: tIS violation on %s by %t", $time, cmd_addr_string[i], tm_cmd_addr[i] + TIS - $time);
end
end
end
// update current state
if (dll_locked) begin
if (mr_chk == 0) begin
mr_chk = 1;
end else if (init_mode_reg[0] && (mr_chk == 1)) begin
// check CL value against the clock frequency
// check WR value against the clock frequency
if (ceil(write_recovery*tck_avg) < TWR)
$display ("%m: at time %t ERROR: Write Recovery = %d is illegal @tCK(avg) = %f", $time, write_recovery, tck_avg);
// check the CWL value against the clock frequency
if (check_strict_timing) begin
case (cas_write_latency)
5 : if (tck_avg < 2500.0) $display ("%m: at time %t ERROR: CWL = %d is illegal @tCK(avg) = %f", $time, cas_write_latency, tck_avg);
6 : if ((tck_avg < 1875.0) || (tck_avg >= 2500.0)) $display ("%m: at time %t ERROR: CWL = %d is illegal @tCK(avg) = %f", $time, cas_write_latency, tck_avg);
7 : if ((tck_avg < 1500.0) || (tck_avg >= 1875.0)) $display ("%m: at time %t ERROR: CWL = %d is illegal @tCK(avg) = %f", $time, cas_write_latency, tck_avg);
8 : if ((tck_avg < 1250.0) || (tck_avg >= 1500.0)) $display ("%m: at time %t ERROR: CWL = %d is illegal @tCK(avg) = %f", $time, cas_write_latency, tck_avg);
9 : if ((tck_avg < 1071.0) || (tck_avg >= 1250.0)) $display ("%m: at time %t ERROR: CWL = %d is illegal @tCK(avg) = %f", $time, cas_write_latency, tck_avg);
10: if ((tck_avg < 937.5) || (tck_avg >= 1071.0)) $display ("%m: at time %t ERROR: CWL = %d is illegal @tCK(avg) = %f", $time, cas_write_latency, tck_avg);
default : $display ("%m: at time %t ERROR: CWL = %d is illegal @tCK(avg) = %f", $time, cas_write_latency, tck_avg);
endcase
// check the CL value against the clock frequency
if (!valid_cl(cas_latency, cas_write_latency))
$display ("%m: at time %t ERROR: CAS Latency = %d is not valid when CAS Write Latency = %d", $time, cas_latency, cas_write_latency);
end
mr_chk = 2;
end
end else if (!in_self_refresh) begin
mr_chk = 0;
if (ck_cntr - ck_dll_reset == TDLLK) begin
dll_locked = 1;
end
end
if (|auto_precharge_bank) begin
for (i=0; i<`BANKS; i=i+1) begin
// Write with Auto Precharge Calculation
// 1. Meet minimum tRAS requirement
// 2. Write Latency PLUS BL/2 cycles PLUS WR after Write command
if (write_precharge_bank[i]) begin
if ($time - tm_bank_activate[i] >= TRAS_MIN) begin
if (ck_cntr - ck_bank_write[i] >= write_latency + burst_length/2 + write_recovery) begin
if (DEBUG) $display ("%m: at time %t INFO: Auto Precharge bank %d", $time, i);
write_precharge_bank[i] = 0;
active_bank[i] = 0;
auto_precharge_bank[i] = 0;
tm_bank_precharge[i] = $time;
tm_precharge = $time;
ck_precharge = ck_cntr;
end
end
end
// Read with Auto Precharge Calculation
// 1. Meet minimum tRAS requirement
// 2. Additive Latency plus 4 cycles after Read command
// 3. tRTP after the last 8-bit prefetch
if (read_precharge_bank[i]) begin
if (($time - tm_bank_activate[i] >= TRAS_MIN) && (ck_cntr - ck_bank_read[i] >= additive_latency + TRTP_TCK)) begin
read_precharge_bank[i] = 0;
// In case the internal precharge is pushed out by tRTP, tRP starts at the point where
// the internal precharge happens (not at the next rising clock edge after this event).
if ($time - tm_bank_read_end[i] < TRTP) begin
if (DEBUG) $display ("%m: at time %t INFO: Auto Precharge bank %d", tm_bank_read_end[i] + TRTP, i);
active_bank[i] <= #(tm_bank_read_end[i] + TRTP - $time) 0;
auto_precharge_bank[i] <= #(tm_bank_read_end[i] + TRTP - $time) 0;
tm_bank_precharge[i] <= #(tm_bank_read_end[i] + TRTP - $time) tm_bank_read_end[i] + TRTP;
tm_precharge <= #(tm_bank_read_end[i] + TRTP - $time) tm_bank_read_end[i] + TRTP;
ck_precharge = ck_cntr;
end else begin
if (DEBUG) $display ("%m: at time %t INFO: Auto Precharge bank %d", $time, i);
active_bank[i] = 0;
auto_precharge_bank[i] = 0;
tm_bank_precharge[i] = $time;
tm_precharge = $time;
ck_precharge = ck_cntr;
end
end
end
end
end
// respond to incoming command
if (cke_in ^ prev_cke) begin
tm_cke_cmd <= $time;
ck_cke_cmd <= ck_cntr;
end
cmd_task(prev_cke, cke_in, cmd_n_in, ba_in, addr_in);
if ((cmd_n_in == WRITE) || (cmd_n_in == READ)) begin
al_pipeline[2*additive_latency] = 1'b1;
end
if (al_pipeline[0]) begin
// check tRCD after additive latency
if ((rd_pipeline[2*cas_latency - 1]) && ($time - tm_bank_activate[ba_pipeline[2*cas_latency - 1]] < TRCD))
$display ("%m: at time %t ERROR: tRCD violation during %s", $time, cmd_string[READ]);
if ((wr_pipeline[2*cas_write_latency + 1]) && ($time - tm_bank_activate[ba_pipeline[2*cas_write_latency + 1]] < TRCD))
$display ("%m: at time %t ERROR: tRCD violation during %s", $time, cmd_string[WRITE]);
// check tWTR after additive latency
if (rd_pipeline[2*cas_latency - 1]) begin //{
if (truebl4) begin //{
i = ba_pipeline[2*cas_latency - 1];
if ($time - tm_group_write_end[i[1]] < TWTR)
$display ("%m: at time %t ERROR: tWTR violation during %s", $time, cmd_string[READ]);
if ($time - tm_write_end < TWTR_DG)
$display ("%m: at time %t ERROR: tWTR_DG violation during %s", $time, cmd_string[READ]);
end else begin
if ($time - tm_write_end < TWTR)
$display ("%m: at time %t ERROR: tWTR violation during %s", $time, cmd_string[READ]);
end
end
end
if (rd_pipeline) begin
if (rd_pipeline[2*cas_latency - 1]) begin
tm_bank_read_end[ba_pipeline[2*cas_latency - 1]] <= $time;
end
end
for (i=0; i<`BANKS; i=i+1) begin
if ((ck_cntr - ck_bank_write[i] > write_latency) && (ck_cntr - ck_bank_write[i] <= write_latency + burst_length/2)) begin
tm_bank_write_end[i] <= $time;
tm_group_write_end[i[1]] <= $time;
tm_write_end <= $time;
end
end
// clk pin is disabled during self refresh
if (!in_self_refresh && tm_ck_pos ) begin
tjit_cc_time = $time - tm_ck_pos - tck_i;
tck_i = $time - tm_ck_pos;
tck_avg = tck_avg - tck_sample[ck_cntr%PERTCKAVG]/$itor(PERTCKAVG);
tck_avg = tck_avg + tck_i/$itor(PERTCKAVG);
tck_sample[ck_cntr%PERTCKAVG] = tck_i;
tjit_per_rtime = tck_i - tck_avg;
if (dll_locked && check_strict_timing) begin
// check accumulated error
terr_nper_rtime = 0;
for (i=0; i<12; i=i+1) begin
terr_nper_rtime = terr_nper_rtime + tck_sample[i] - tck_avg;
terr_nper_rtime = abs_value(terr_nper_rtime);
case (i)
0 :;
1 : if (terr_nper_rtime - TERR_2PER >= 1.0) $display ("%m: at time %t ERROR: tERR(2per) violation by %f ps.", $time, terr_nper_rtime - TERR_2PER);
2 : if (terr_nper_rtime - TERR_3PER >= 1.0) $display ("%m: at time %t ERROR: tERR(3per) violation by %f ps.", $time, terr_nper_rtime - TERR_3PER);
3 : if (terr_nper_rtime - TERR_4PER >= 1.0) $display ("%m: at time %t ERROR: tERR(4per) violation by %f ps.", $time, terr_nper_rtime - TERR_4PER);
4 : if (terr_nper_rtime - TERR_5PER >= 1.0) $display ("%m: at time %t ERROR: tERR(5per) violation by %f ps.", $time, terr_nper_rtime - TERR_5PER);
5 : if (terr_nper_rtime - TERR_6PER >= 1.0) $display ("%m: at time %t ERROR: tERR(6per) violation by %f ps.", $time, terr_nper_rtime - TERR_6PER);
6 : if (terr_nper_rtime - TERR_7PER >= 1.0) $display ("%m: at time %t ERROR: tERR(7per) violation by %f ps.", $time, terr_nper_rtime - TERR_7PER);
7 : if (terr_nper_rtime - TERR_8PER >= 1.0) $display ("%m: at time %t ERROR: tERR(8per) violation by %f ps.", $time, terr_nper_rtime - TERR_8PER);
8 : if (terr_nper_rtime - TERR_9PER >= 1.0) $display ("%m: at time %t ERROR: tERR(9per) violation by %f ps.", $time, terr_nper_rtime - TERR_9PER);
9 : if (terr_nper_rtime - TERR_10PER >= 1.0) $display ("%m: at time %t ERROR: tERR(10per) violation by %f ps.", $time, terr_nper_rtime - TERR_10PER);
10 : if (terr_nper_rtime - TERR_11PER >= 1.0) $display ("%m: at time %t ERROR: tERR(11per) violation by %f ps.", $time, terr_nper_rtime - TERR_11PER);
11 : if (terr_nper_rtime - TERR_12PER >= 1.0) $display ("%m: at time %t ERROR: tERR(12per) violation by %f ps.", $time, terr_nper_rtime - TERR_12PER);
endcase
end
// check tCK min/max/jitter
if (abs_value(tjit_per_rtime) - TJIT_PER >= 1.0)
$display ("%m: at time %t ERROR: tJIT(per) violation by %f ps.", $time, abs_value(tjit_per_rtime) - TJIT_PER);
if (abs_value(tjit_cc_time) - TJIT_CC >= 1.0)
$display ("%m: at time %t ERROR: tJIT(cc) violation by %f ps.", $time, abs_value(tjit_cc_time) - TJIT_CC);
if (TCK_MIN - tck_avg >= 1.0)
$display ("%m: at time %t ERROR: tCK(avg) minimum violation by %f ps.", $time, TCK_MIN - tck_avg);
if (tck_avg - TCK_MAX >= 1.0)
$display ("%m: at time %t ERROR: tCK(avg) maximum violation by %f ps.", $time, tck_avg - TCK_MAX);
// check tCL
if (tm_ck_neg - $time < TCL_ABS_MIN*tck_avg)
$display ("%m: at time %t ERROR: tCL(abs) minimum violation on CLK by %t", $time, TCL_ABS_MIN*tck_avg - tm_ck_neg + $time);
if (tcl_avg < TCL_AVG_MIN*tck_avg)
$display ("%m: at time %t ERROR: tCL(avg) minimum violation on CLK by %t", $time, TCL_AVG_MIN*tck_avg - tcl_avg);
if (tcl_avg > TCL_AVG_MAX*tck_avg)
$display ("%m: at time %t ERROR: tCL(avg) maximum violation on CLK by %t", $time, tcl_avg - TCL_AVG_MAX*tck_avg);
end
// calculate the tch avg jitter
tch_avg = tch_avg - tch_sample[ck_cntr%PERTCKAVG]/$itor(PERTCKAVG);
tch_avg = tch_avg + tch_i/$itor(PERTCKAVG);
tch_sample[ck_cntr%PERTCKAVG] = tch_i;
tjit_ch_rtime = tch_i - tch_avg;
duty_cycle = $rtoi(tch_avg*100/tck_avg);
// update timers/counters
tcl_i <= $time - tm_ck_neg;
end
prev_odt <= odt_in;
// update timers/counters
ck_cntr <= ck_cntr + 1;
tm_ck_pos = $time;
end else begin
// clk pin is disabled during self refresh
if (!in_self_refresh) begin
if (dll_locked && check_strict_timing) begin
if ($time - tm_ck_pos < TCH_ABS_MIN*tck_avg)
$display ("%m: at time %t ERROR: tCH(abs) minimum violation on CLK by %t", $time, TCH_ABS_MIN*tck_avg - $time + tm_ck_pos);
if (tch_avg < TCH_AVG_MIN*tck_avg)
$display ("%m: at time %t ERROR: tCH(avg) minimum violation on CLK by %t", $time, TCH_AVG_MIN*tck_avg - tch_avg);
if (tch_avg > TCH_AVG_MAX*tck_avg)
$display ("%m: at time %t ERROR: tCH(avg) maximum violation on CLK by %t", $time, tch_avg - TCH_AVG_MAX*tck_avg);
end
// calculate the tcl avg jitter
tcl_avg = tcl_avg - tcl_sample[ck_cntr%PERTCKAVG]/$itor(PERTCKAVG);
tcl_avg = tcl_avg + tcl_i/$itor(PERTCKAVG);
tcl_sample[ck_cntr%PERTCKAVG] = tcl_i;
// update timers/counters
tch_i <= $time - tm_ck_pos;
end
tm_ck_neg = $time;
end
// on die termination
if (odt_en || dyn_odt_en) begin
// odt pin is disabled during self refresh
if (!in_self_refresh && diff_ck) begin
if ($time - tm_odt < TIS)
$display ("%m: at time %t ERROR: tIS violation on ODT by %t", $time, tm_odt + TIS - $time);
if (prev_odt ^ odt_in) begin
if (!dll_locked)
$display ("%m: at time %t WARNING: tDLLK violation during ODT transition.", $time);
if (($time - tm_load_mode < TMOD) || (ck_cntr - ck_load_mode < TMOD_TCK))
$display ("%m: at time %t ERROR: tMOD violation during ODT transition", $time);
if (ck_cntr - ck_zqinit < TZQINIT)
$display ("%m: at time %t ERROR: TZQinit violation during ODT transition", $time);
if (ck_cntr - ck_zqoper < TZQOPER)
$display ("%m: at time %t ERROR: TZQoper violation during ODT transition", $time);
if (ck_cntr - ck_zqcs < TZQCS)
$display ("%m: at time %t ERROR: tZQcs violation during ODT transition", $time);
// if (($time - tm_slow_exit_pd < TXPDLL) || (ck_cntr - ck_slow_exit_pd < TXPDLL_TCK))
// $display ("%m: at time %t ERROR: tXPDLL violation during ODT transition", $time);
if (ck_cntr - ck_self_refresh < TXSDLL)
$display ("%m: at time %t ERROR: tXSDLL violation during ODT transition", $time);
if (in_self_refresh)
$display ("%m: at time %t ERROR: Illegal ODT transition during Self Refresh.", $time);
if (!odt_in && (ck_cntr - ck_odt < ODTH4))
$display ("%m: at time %t ERROR: ODTH4 violation during ODT transition", $time);
if (!odt_in && (ck_cntr - ck_odth8 < ODTH8))
$display ("%m: at time %t ERROR: ODTH8 violation during ODT transition", $time);
if (($time - tm_slow_exit_pd < TXPDLL) || (ck_cntr - ck_slow_exit_pd < TXPDLL_TCK))
$display ("%m: at time %t WARNING: tXPDLL during ODT transition. Synchronous or asynchronous change in termination resistance is possible.", $time);
// async ODT mode applies:
// 1.) during precharge power down with DLL off
// 2.) if tANPD has not been satisfied
// 3.) until tXPDLL has been satisfied
if ((in_power_down && low_power && (active_bank == 0)) || ($time - tm_slow_exit_pd < TXPDLL) || (ck_cntr - ck_slow_exit_pd < TXPDLL_TCK)) begin
odt_state = odt_in;
if (DEBUG && odt_en) $display ("%m: at time %t INFO: Async On Die Termination Rtt_NOM = %d Ohm", $time, {32{odt_state}} & get_rtt_nom(odt_rtt_nom));
if (odt_state) begin
odt_state_dly <= #(TAONPD) odt_state;
end else begin
odt_state_dly <= #(TAOFPD) odt_state;
end
// sync ODT mode applies:
// 1.) during normal operation
// 2.) during active power down
// 3.) during precharge power down with DLL on
end else begin
odt_pipeline[2*(write_latency - 2)] = 1'b1; // ODTLon, ODTLoff
end
ck_odt <= ck_cntr;
end
end
if (odt_pipeline[0]) begin
odt_state = ~odt_state;
if (DEBUG && odt_en) $display ("%m: at time %t INFO: Sync On Die Termination Rtt_NOM = %d Ohm", $time, {32{odt_state}} & get_rtt_nom(odt_rtt_nom));
if (odt_state) begin
odt_state_dly <= #(TAON) odt_state;
end else begin
odt_state_dly <= #(TAOF*tck_avg) odt_state;
end
end
if (rd_pipeline[RDQSEN_PRE]) begin
odt_cntr = 1 + RDQSEN_PRE + bl_pipeline[RDQSEN_PRE] + RDQSEN_PST - 1;
end
if (odt_cntr > 0) begin
if ((get_rtt_nom(odt_rtt_nom) > 0) && odt_state) begin
$display ("%m: at time %t ERROR: On Die Termination must be OFF during Read data transfer.", $time);
end
odt_cntr = odt_cntr - 1;
end
if (dyn_odt_en && ( odt_state || feature_odt_hi) ) begin
if (DEBUG && (dyn_odt_state ^ dyn_odt_pipeline[0]))
$display ("%m: at time %t INFO: Sync On Die Termination Rtt_WR = %d Ohm", $time, {32{dyn_odt_pipeline[0]}} & get_rtt_wr(odt_rtt_wr));
dyn_odt_state = dyn_odt_pipeline[0];
end
dyn_odt_state_dly <= #(TADC*tck_avg) dyn_odt_state;
end
if (cke_in && write_levelization) begin
for (i=0; i<DQS_BITS; i=i+1) begin
if ($time - tm_dqs_pos[i] < TWLH)
$display ("%m: at time %t WARNING: tWLH violation on DQS bit %d positive edge. Indeterminate CK capture is possible.", $time, i);
end
end
// shift pipelines
if (|wr_pipeline || |rd_pipeline || |al_pipeline) begin
al_pipeline = al_pipeline>>1;
wr_pipeline = wr_pipeline>>1;
rd_pipeline = rd_pipeline>>1;
for (i=0; i<`MAX_PIPE; i=i+1) begin
bl_pipeline[i] = bl_pipeline[i+1];
ba_pipeline[i] = ba_pipeline[i+1];
row_pipeline[i] = row_pipeline[i+1];
col_pipeline[i] = col_pipeline[i+1];
end
end
if (|odt_pipeline || |dyn_odt_pipeline) begin
odt_pipeline = odt_pipeline>>1;
dyn_odt_pipeline = dyn_odt_pipeline>>1;
end
end
end
// receiver(s)
task dqs_even_receiver;
input [4:0] i;
reg [127:0] bit_mask;
begin
bit_mask = {`DQ_PER_DQS{1'b1}}<<(i*`DQ_PER_DQS);
if (dqs_even[i]) begin
if (tdqs_en) begin // tdqs disables dm
dm_in_pos[i] = 1'b0;
end else begin
dm_in_pos[i] = dm_in[i];
end
dq_in_pos = (dq_in & bit_mask) | (dq_in_pos & ~bit_mask);
end
end
endtask
always @(posedge dqs_even[ 0]) dqs_even_receiver( 0);
always @(posedge dqs_even[ 1]) dqs_even_receiver( 1);
always @(posedge dqs_even[ 2]) dqs_even_receiver( 2);
always @(posedge dqs_even[ 3]) dqs_even_receiver( 3);
always @(posedge dqs_even[ 4]) dqs_even_receiver( 4);
always @(posedge dqs_even[ 5]) dqs_even_receiver( 5);
always @(posedge dqs_even[ 6]) dqs_even_receiver( 6);
always @(posedge dqs_even[ 7]) dqs_even_receiver( 7);
always @(posedge dqs_even[ 8]) dqs_even_receiver( 8);
always @(posedge dqs_even[ 9]) dqs_even_receiver( 9);
always @(posedge dqs_even[10]) dqs_even_receiver(10);
always @(posedge dqs_even[11]) dqs_even_receiver(11);
always @(posedge dqs_even[12]) dqs_even_receiver(12);
always @(posedge dqs_even[13]) dqs_even_receiver(13);
always @(posedge dqs_even[14]) dqs_even_receiver(14);
always @(posedge dqs_even[15]) dqs_even_receiver(15);
task dqs_odd_receiver;
input [4:0] i;
reg [127:0] bit_mask;
begin
bit_mask = {`DQ_PER_DQS{1'b1}}<<(i*`DQ_PER_DQS);
if (dqs_odd[i]) begin
if (tdqs_en) begin // tdqs disables dm
dm_in_neg[i] = 1'b0;
end else begin
dm_in_neg[i] = dm_in[i];
end
dq_in_neg = (dq_in & bit_mask) | (dq_in_neg & ~bit_mask);
end
end
endtask
always @(posedge dqs_odd[ 0]) dqs_odd_receiver( 0);
always @(posedge dqs_odd[ 1]) dqs_odd_receiver( 1);
always @(posedge dqs_odd[ 2]) dqs_odd_receiver( 2);
always @(posedge dqs_odd[ 3]) dqs_odd_receiver( 3);
always @(posedge dqs_odd[ 4]) dqs_odd_receiver( 4);
always @(posedge dqs_odd[ 5]) dqs_odd_receiver( 5);
always @(posedge dqs_odd[ 6]) dqs_odd_receiver( 6);
always @(posedge dqs_odd[ 7]) dqs_odd_receiver( 7);
always @(posedge dqs_odd[ 8]) dqs_odd_receiver( 8);
always @(posedge dqs_odd[ 9]) dqs_odd_receiver( 9);
always @(posedge dqs_odd[10]) dqs_odd_receiver(10);
always @(posedge dqs_odd[11]) dqs_odd_receiver(11);
always @(posedge dqs_odd[12]) dqs_odd_receiver(12);
always @(posedge dqs_odd[13]) dqs_odd_receiver(13);
always @(posedge dqs_odd[14]) dqs_odd_receiver(14);
always @(posedge dqs_odd[15]) dqs_odd_receiver(15);
// Processes to check hold and pulse width of control signals
always @(posedge rst_n_in) begin
if ($time > 100000) begin
if (tm_rst_n + 100000 > $time)
$display ("%m: at time %t ERROR: RST_N pulse width violation by %t", $time, tm_rst_n + 100000 - $time);
end
tm_rst_n = $time;
end
always @(cke_in) begin
if (rst_n_in) begin
if ($time > TIH) begin
if ($time - tm_ck_pos < TIH)
$display ("%m: at time %t ERROR: tIH violation on CKE by %t", $time, tm_ck_pos + TIH - $time);
end
if ($time - tm_cke < TIPW)
$display ("%m: at time %t ERROR: tIPW violation on CKE by %t", $time, tm_cke + TIPW - $time);
end
tm_cke = $time;
end
always @(odt_in) begin
if (rst_n_in && odt_en && !in_self_refresh) begin
if ($time - tm_ck_pos < TIH)
$display ("%m: at time %t ERROR: tIH violation on ODT by %t", $time, tm_ck_pos + TIH - $time);
if ($time - tm_odt < TIPW)
$display ("%m: at time %t ERROR: tIPW violation on ODT by %t", $time, tm_odt + TIPW - $time);
end
tm_odt = $time;
end
task cmd_addr_timing_check;
input i;
reg [4:0] i;
begin
if (rst_n_in && prev_cke) begin
if ((i == 0) && ($time - tm_ck_pos < TIH)) // always check tIH for CS#
$display ("%m: at time %t ERROR: tIH violation on %s by %t", $time, cmd_addr_string[i], tm_ck_pos + TIH - $time);
if ((i > 0) && (cs_n_in == 0) &&($time - tm_ck_pos < TIH)) // Only check tIH for cmd_addr if CS# is low
$display ("%m: at time %t ERROR: tIH violation on %s by %t", $time, cmd_addr_string[i], tm_ck_pos + TIH - $time);
if ((i == 0) && ($time - tm_cmd_addr[i] < TIPW)) // always check tIPW for CS#
$display ("%m: at time %t ERROR: tIPW violation on %s by %t", $time, cmd_addr_string[i], tm_cmd_addr[i] + TIPW - $time);
if ((i > 0) && (cs_n_in == 0) && ($time - tm_cmd_addr[i] < TIPW))
$display ("%m: at time %t ERROR: tIPW violation on %s by %t", $time, cmd_addr_string[i], tm_cmd_addr[i] + TIPW - $time);
end
tm_cmd_addr[i] = $time;
end
endtask
always @(cs_n_in ) cmd_addr_timing_check( 0);
always @(ras_n_in ) cmd_addr_timing_check( 1);
always @(cas_n_in ) cmd_addr_timing_check( 2);
always @(we_n_in ) cmd_addr_timing_check( 3);
always @(ba_in [ 0]) cmd_addr_timing_check( 4);
always @(ba_in [ 1]) cmd_addr_timing_check( 5);
always @(ba_in [ 2]) cmd_addr_timing_check( 6);
always @(addr_in[ 0]) cmd_addr_timing_check( 7);
always @(addr_in[ 1]) cmd_addr_timing_check( 8);
always @(addr_in[ 2]) cmd_addr_timing_check( 9);
always @(addr_in[ 3]) cmd_addr_timing_check(10);
always @(addr_in[ 4]) cmd_addr_timing_check(11);
always @(addr_in[ 5]) cmd_addr_timing_check(12);
always @(addr_in[ 6]) cmd_addr_timing_check(13);
always @(addr_in[ 7]) cmd_addr_timing_check(14);
always @(addr_in[ 8]) cmd_addr_timing_check(15);
always @(addr_in[ 9]) cmd_addr_timing_check(16);
always @(addr_in[10]) cmd_addr_timing_check(17);
always @(addr_in[11]) cmd_addr_timing_check(18);
always @(addr_in[12]) cmd_addr_timing_check(19);
always @(addr_in[13]) cmd_addr_timing_check(20);
always @(addr_in[14]) cmd_addr_timing_check(21);
always @(addr_in[15]) cmd_addr_timing_check(22);
always @(addr_in[16]) cmd_addr_timing_check(23);
// Processes to check setup and hold of data signals
task dm_timing_check;
input i;
reg [4:0] i;
begin
if (dqs_in_valid) begin
if ($time - tm_dqs[i] < TDH)
$display ("%m: at time %t ERROR: tDH violation on DM bit %d by %t", $time, i, tm_dqs[i] + TDH - $time);
if (check_dm_tdipw[i]) begin
if ($time - tm_dm[i] < TDIPW)
$display ("%m: at time %t ERROR: tDIPW violation on DM bit %d by %t", $time, i, tm_dm[i] + TDIPW - $time);
end
end
check_dm_tdipw[i] <= 1'b0;
tm_dm[i] = $time;
end
endtask
always @(dm_in[ 0]) dm_timing_check( 0);
always @(dm_in[ 1]) dm_timing_check( 1);
always @(dm_in[ 2]) dm_timing_check( 2);
always @(dm_in[ 3]) dm_timing_check( 3);
always @(dm_in[ 4]) dm_timing_check( 4);
always @(dm_in[ 5]) dm_timing_check( 5);
always @(dm_in[ 6]) dm_timing_check( 6);
always @(dm_in[ 7]) dm_timing_check( 7);
always @(dm_in[ 8]) dm_timing_check( 8);
always @(dm_in[ 9]) dm_timing_check( 9);
always @(dm_in[10]) dm_timing_check(10);
always @(dm_in[11]) dm_timing_check(11);
always @(dm_in[12]) dm_timing_check(12);
always @(dm_in[13]) dm_timing_check(13);
always @(dm_in[14]) dm_timing_check(14);
always @(dm_in[15]) dm_timing_check(15);
always @(dm_in[16]) dm_timing_check(16);
always @(dm_in[17]) dm_timing_check(17);
always @(dm_in[18]) dm_timing_check(18);
always @(dm_in[19]) dm_timing_check(19);
always @(dm_in[20]) dm_timing_check(20);
always @(dm_in[21]) dm_timing_check(21);
always @(dm_in[22]) dm_timing_check(22);
always @(dm_in[23]) dm_timing_check(23);
always @(dm_in[24]) dm_timing_check(24);
always @(dm_in[25]) dm_timing_check(25);
always @(dm_in[26]) dm_timing_check(26);
always @(dm_in[27]) dm_timing_check(27);
always @(dm_in[28]) dm_timing_check(28);
always @(dm_in[29]) dm_timing_check(29);
always @(dm_in[30]) dm_timing_check(30);
always @(dm_in[31]) dm_timing_check(31);
task dq_timing_check;
input i;
reg [6:0] i;
begin
if (dqs_in_valid) begin
if ($time - tm_dqs[i/(`DQ_PER_DQS)] < TDH)
$display ("%m: at time %t ERROR: tDH violation on DQ bit %d by %t", $time, i, tm_dqs[i/`DQ_PER_DQS] + TDH - $time);
if (check_dq_tdipw[i]) begin
if ($time - tm_dq[i] < TDIPW)
$display ("%m: at time %t ERROR: tDIPW violation on DQ bit %d by %t", $time, i, tm_dq[i] + TDIPW - $time);
end
end
check_dq_tdipw[i] <= 1'b0;
tm_dq[i] = $time;
end
endtask
always @(dq_in[ 0]) dq_timing_check( 0);
always @(dq_in[ 1]) dq_timing_check( 1);
always @(dq_in[ 2]) dq_timing_check( 2);
always @(dq_in[ 3]) dq_timing_check( 3);
always @(dq_in[ 4]) dq_timing_check( 4);
always @(dq_in[ 5]) dq_timing_check( 5);
always @(dq_in[ 6]) dq_timing_check( 6);
always @(dq_in[ 7]) dq_timing_check( 7);
always @(dq_in[ 8]) dq_timing_check( 8);
always @(dq_in[ 9]) dq_timing_check( 9);
always @(dq_in[10]) dq_timing_check(10);
always @(dq_in[11]) dq_timing_check(11);
always @(dq_in[12]) dq_timing_check(12);
always @(dq_in[13]) dq_timing_check(13);
always @(dq_in[14]) dq_timing_check(14);
always @(dq_in[15]) dq_timing_check(15);
always @(dq_in[16]) dq_timing_check(16);
always @(dq_in[17]) dq_timing_check(17);
always @(dq_in[18]) dq_timing_check(18);
always @(dq_in[19]) dq_timing_check(19);
always @(dq_in[20]) dq_timing_check(20);
always @(dq_in[21]) dq_timing_check(21);
always @(dq_in[22]) dq_timing_check(22);
always @(dq_in[23]) dq_timing_check(23);
always @(dq_in[24]) dq_timing_check(24);
always @(dq_in[25]) dq_timing_check(25);
always @(dq_in[26]) dq_timing_check(26);
always @(dq_in[27]) dq_timing_check(27);
always @(dq_in[28]) dq_timing_check(28);
always @(dq_in[29]) dq_timing_check(29);
always @(dq_in[30]) dq_timing_check(30);
always @(dq_in[31]) dq_timing_check(31);
always @(dq_in[32]) dq_timing_check(32);
always @(dq_in[33]) dq_timing_check(33);
always @(dq_in[34]) dq_timing_check(34);
always @(dq_in[35]) dq_timing_check(35);
always @(dq_in[36]) dq_timing_check(36);
always @(dq_in[37]) dq_timing_check(37);
always @(dq_in[38]) dq_timing_check(38);
always @(dq_in[39]) dq_timing_check(39);
always @(dq_in[40]) dq_timing_check(40);
always @(dq_in[41]) dq_timing_check(41);
always @(dq_in[42]) dq_timing_check(42);
always @(dq_in[43]) dq_timing_check(43);
always @(dq_in[44]) dq_timing_check(44);
always @(dq_in[45]) dq_timing_check(45);
always @(dq_in[46]) dq_timing_check(46);
always @(dq_in[47]) dq_timing_check(47);
always @(dq_in[48]) dq_timing_check(48);
always @(dq_in[49]) dq_timing_check(49);
always @(dq_in[50]) dq_timing_check(50);
always @(dq_in[51]) dq_timing_check(51);
always @(dq_in[52]) dq_timing_check(52);
always @(dq_in[53]) dq_timing_check(53);
always @(dq_in[54]) dq_timing_check(54);
always @(dq_in[55]) dq_timing_check(55);
always @(dq_in[56]) dq_timing_check(56);
always @(dq_in[57]) dq_timing_check(57);
always @(dq_in[58]) dq_timing_check(58);
always @(dq_in[59]) dq_timing_check(59);
always @(dq_in[60]) dq_timing_check(60);
always @(dq_in[61]) dq_timing_check(61);
always @(dq_in[62]) dq_timing_check(62);
always @(dq_in[63]) dq_timing_check(63);
always @(dq_in[64]) dq_timing_check(64);
always @(dq_in[65]) dq_timing_check(65);
always @(dq_in[66]) dq_timing_check(66);
always @(dq_in[67]) dq_timing_check(67);
always @(dq_in[68]) dq_timing_check(68);
always @(dq_in[69]) dq_timing_check(69);
always @(dq_in[70]) dq_timing_check(70);
always @(dq_in[71]) dq_timing_check(71);
always @(dq_in[72]) dq_timing_check(72);
always @(dq_in[73]) dq_timing_check(73);
always @(dq_in[74]) dq_timing_check(74);
always @(dq_in[75]) dq_timing_check(75);
always @(dq_in[76]) dq_timing_check(76);
always @(dq_in[77]) dq_timing_check(77);
always @(dq_in[78]) dq_timing_check(78);
always @(dq_in[79]) dq_timing_check(79);
always @(dq_in[80]) dq_timing_check(80);
always @(dq_in[81]) dq_timing_check(81);
always @(dq_in[82]) dq_timing_check(82);
always @(dq_in[83]) dq_timing_check(83);
always @(dq_in[84]) dq_timing_check(84);
always @(dq_in[85]) dq_timing_check(85);
always @(dq_in[86]) dq_timing_check(86);
always @(dq_in[87]) dq_timing_check(87);
always @(dq_in[88]) dq_timing_check(88);
always @(dq_in[89]) dq_timing_check(89);
always @(dq_in[90]) dq_timing_check(90);
always @(dq_in[91]) dq_timing_check(91);
always @(dq_in[92]) dq_timing_check(92);
always @(dq_in[93]) dq_timing_check(93);
always @(dq_in[94]) dq_timing_check(94);
always @(dq_in[95]) dq_timing_check(95);
always @(dq_in[96]) dq_timing_check(96);
always @(dq_in[97]) dq_timing_check(97);
always @(dq_in[98]) dq_timing_check(98);
always @(dq_in[99]) dq_timing_check(99);
always @(dq_in[100]) dq_timing_check(100);
always @(dq_in[101]) dq_timing_check(101);
always @(dq_in[102]) dq_timing_check(102);
always @(dq_in[103]) dq_timing_check(103);
always @(dq_in[104]) dq_timing_check(104);
always @(dq_in[105]) dq_timing_check(105);
always @(dq_in[106]) dq_timing_check(106);
always @(dq_in[107]) dq_timing_check(107);
always @(dq_in[108]) dq_timing_check(108);
always @(dq_in[109]) dq_timing_check(109);
always @(dq_in[110]) dq_timing_check(110);
always @(dq_in[111]) dq_timing_check(111);
always @(dq_in[112]) dq_timing_check(112);
always @(dq_in[113]) dq_timing_check(113);
always @(dq_in[114]) dq_timing_check(114);
always @(dq_in[115]) dq_timing_check(115);
always @(dq_in[116]) dq_timing_check(116);
always @(dq_in[117]) dq_timing_check(117);
always @(dq_in[118]) dq_timing_check(118);
always @(dq_in[119]) dq_timing_check(119);
always @(dq_in[120]) dq_timing_check(120);
always @(dq_in[121]) dq_timing_check(121);
always @(dq_in[122]) dq_timing_check(122);
always @(dq_in[123]) dq_timing_check(123);
always @(dq_in[124]) dq_timing_check(124);
always @(dq_in[125]) dq_timing_check(125);
always @(dq_in[126]) dq_timing_check(126);
always @(dq_in[127]) dq_timing_check(127);
task dqs_pos_timing_check;
input i;
reg [5:0] i;
reg [4:0] j;
begin
if (write_levelization && i<32) begin
if (ck_cntr - ck_load_mode < TWLMRD)
$display ("%m: at time %t ERROR: tWLMRD violation on DQS bit %d positive edge.", $time, i);
if (($time - tm_ck_pos < TWLS) || ($time - tm_ck_neg < TWLS))
$display ("%m: at time %t WARNING: tWLS violation on DQS bit %d positive edge. Indeterminate CK capture is possible.", $time, i);
if (DEBUG)
$display ("%m: at time %t Write Leveling @ DQS ck = %b", $time, diff_ck);
dq_out_en_dly[i*`DQ_PER_DQS] <= #(TWLO) 1'b1;
dq_out_dly[i*`DQ_PER_DQS] <= #(TWLO) diff_ck;
`ifdef WL_ALLDQ
for (j=1; j<`DQ_PER_DQS; j=j+1) begin
dq_out_en_dly[i*`DQ_PER_DQS+j] <= #(TWLO) 1'b1;
dq_out_dly[i*`DQ_PER_DQS+j] <= #(TWLO) diff_ck;
end
`else
for (j=1; j<`DQ_PER_DQS; j=j+1) begin
dq_out_en_dly[i*`DQ_PER_DQS+j] <= #(TWLO + TWLOE) 1'b1;
dq_out_dly[i*`DQ_PER_DQS+j] <= #(TWLO + TWLOE) 1'b0;
end
`endif
end
if (dqs_in_valid && ((wdqs_pos_cntr[i] < wr_burst_length/2) || b2b_write)) begin
if (dqs_in[i] ^ prev_dqs_in[i]) begin
if (dll_locked) begin
if (check_write_preamble[i]) begin
if ($time - tm_dqs_pos[i] < $rtoi(TWPRE*tck_avg))
$display ("%m: at time %t ERROR: tWPRE violation on %s bit %d", $time, dqs_string[i/32], i%32);
end else if (check_write_postamble[i]) begin
if ($time - tm_dqs_neg[i] < $rtoi(TWPST*tck_avg))
$display ("%m: at time %t ERROR: tWPST violation on %s bit %d", $time, dqs_string[i/32], i%32);
end else begin
if ($time - tm_dqs_neg[i] < $rtoi(TDQSL*tck_avg))
$display ("%m: at time %t ERROR: tDQSL violation on %s bit %d", $time, dqs_string[i/32], i%32);
end
end
if ($time - tm_dm[i%32] < TDS)
$display ("%m: at time %t ERROR: tDS violation on DM bit %d by %t", $time, i, tm_dm[i%32] + TDS - $time);
if (!dq_out_en) begin
for (j=0; j<`DQ_PER_DQS; j=j+1) begin
if ($time - tm_dq[(i%32)*`DQ_PER_DQS+j] < TDS)
$display ("%m: at time %t ERROR: tDS violation on DQ bit %d by %t", $time, i*`DQ_PER_DQS+j, tm_dq[(i%32)*`DQ_PER_DQS+j] + TDS - $time);
check_dq_tdipw[(i%32)*`DQ_PER_DQS+j] <= 1'b1;
end
end
if ((wdqs_pos_cntr[i] < wr_burst_length/2) && !b2b_write) begin
wdqs_pos_cntr[i] <= wdqs_pos_cntr[i] + 1;
end else begin
wdqs_pos_cntr[i] <= 1;
end
check_dm_tdipw[i%32] <= 1'b1;
check_write_preamble[i] <= 1'b0;
check_write_postamble[i] <= 1'b0;
check_write_dqs_low[i] <= 1'b0;
tm_dqs[i%32] <= $time;
end else begin
$display ("%m: at time %t ERROR: Invalid latching edge on %s bit %d", $time, dqs_string[i/32], i%32);
end
end
tm_dqss_pos[i] <= $time;
tm_dqs_pos[i] = $time;
prev_dqs_in[i] <= dqs_in[i];
end
endtask
always @(posedge dqs_in[ 0]) if ( dqs_in[ 0]) dqs_pos_timing_check( 0);
always @(posedge dqs_in[ 1]) if ( dqs_in[ 1]) dqs_pos_timing_check( 1);
always @(posedge dqs_in[ 2]) if ( dqs_in[ 2]) dqs_pos_timing_check( 2);
always @(posedge dqs_in[ 3]) if ( dqs_in[ 3]) dqs_pos_timing_check( 3);
always @(posedge dqs_in[ 4]) if ( dqs_in[ 4]) dqs_pos_timing_check( 4);
always @(posedge dqs_in[ 5]) if ( dqs_in[ 5]) dqs_pos_timing_check( 5);
always @(posedge dqs_in[ 6]) if ( dqs_in[ 6]) dqs_pos_timing_check( 6);
always @(posedge dqs_in[ 7]) if ( dqs_in[ 7]) dqs_pos_timing_check( 7);
always @(posedge dqs_in[ 8]) if ( dqs_in[ 8]) dqs_pos_timing_check( 8);
always @(posedge dqs_in[ 9]) if ( dqs_in[ 9]) dqs_pos_timing_check( 9);
always @(posedge dqs_in[10]) if ( dqs_in[10]) dqs_pos_timing_check(10);
always @(posedge dqs_in[11]) if ( dqs_in[11]) dqs_pos_timing_check(11);
always @(posedge dqs_in[12]) if ( dqs_in[12]) dqs_pos_timing_check(12);
always @(posedge dqs_in[13]) if ( dqs_in[13]) dqs_pos_timing_check(13);
always @(posedge dqs_in[14]) if ( dqs_in[14]) dqs_pos_timing_check(14);
always @(posedge dqs_in[15]) if ( dqs_in[15]) dqs_pos_timing_check(15);
always @(posedge dqs_in[16]) if ( dqs_in[16]) dqs_pos_timing_check(16);
always @(posedge dqs_in[17]) if ( dqs_in[17]) dqs_pos_timing_check(17);
always @(posedge dqs_in[18]) if ( dqs_in[18]) dqs_pos_timing_check(18);
always @(posedge dqs_in[19]) if ( dqs_in[19]) dqs_pos_timing_check(19);
always @(posedge dqs_in[20]) if ( dqs_in[20]) dqs_pos_timing_check(20);
always @(posedge dqs_in[21]) if ( dqs_in[21]) dqs_pos_timing_check(21);
always @(posedge dqs_in[22]) if ( dqs_in[22]) dqs_pos_timing_check(22);
always @(posedge dqs_in[23]) if ( dqs_in[23]) dqs_pos_timing_check(23);
always @(posedge dqs_in[24]) if ( dqs_in[24]) dqs_pos_timing_check(24);
always @(posedge dqs_in[25]) if ( dqs_in[25]) dqs_pos_timing_check(25);
always @(posedge dqs_in[26]) if ( dqs_in[26]) dqs_pos_timing_check(26);
always @(posedge dqs_in[27]) if ( dqs_in[27]) dqs_pos_timing_check(27);
always @(posedge dqs_in[28]) if ( dqs_in[28]) dqs_pos_timing_check(28);
always @(posedge dqs_in[29]) if ( dqs_in[29]) dqs_pos_timing_check(29);
always @(posedge dqs_in[30]) if ( dqs_in[30]) dqs_pos_timing_check(30);
always @(posedge dqs_in[31]) if ( dqs_in[31]) dqs_pos_timing_check(31);
always @(negedge dqs_in[32]) if (!dqs_in[32]) dqs_pos_timing_check(32);
always @(negedge dqs_in[33]) if (!dqs_in[33]) dqs_pos_timing_check(33);
always @(negedge dqs_in[34]) if (!dqs_in[34]) dqs_pos_timing_check(34);
always @(negedge dqs_in[35]) if (!dqs_in[35]) dqs_pos_timing_check(35);
always @(negedge dqs_in[36]) if (!dqs_in[36]) dqs_pos_timing_check(36);
always @(negedge dqs_in[37]) if (!dqs_in[37]) dqs_pos_timing_check(37);
always @(negedge dqs_in[38]) if (!dqs_in[38]) dqs_pos_timing_check(38);
always @(negedge dqs_in[39]) if (!dqs_in[39]) dqs_pos_timing_check(39);
always @(negedge dqs_in[40]) if (!dqs_in[40]) dqs_pos_timing_check(40);
always @(negedge dqs_in[41]) if (!dqs_in[41]) dqs_pos_timing_check(41);
always @(negedge dqs_in[42]) if (!dqs_in[42]) dqs_pos_timing_check(42);
always @(negedge dqs_in[43]) if (!dqs_in[43]) dqs_pos_timing_check(43);
always @(negedge dqs_in[44]) if (!dqs_in[44]) dqs_pos_timing_check(44);
always @(negedge dqs_in[45]) if (!dqs_in[45]) dqs_pos_timing_check(45);
always @(negedge dqs_in[46]) if (!dqs_in[46]) dqs_pos_timing_check(46);
always @(negedge dqs_in[47]) if (!dqs_in[47]) dqs_pos_timing_check(47);
always @(negedge dqs_in[48]) if (!dqs_in[48]) dqs_pos_timing_check(48);
always @(negedge dqs_in[49]) if (!dqs_in[49]) dqs_pos_timing_check(49);
always @(negedge dqs_in[50]) if (!dqs_in[50]) dqs_pos_timing_check(50);
always @(negedge dqs_in[51]) if (!dqs_in[51]) dqs_pos_timing_check(51);
always @(negedge dqs_in[52]) if (!dqs_in[52]) dqs_pos_timing_check(52);
always @(negedge dqs_in[53]) if (!dqs_in[53]) dqs_pos_timing_check(53);
always @(negedge dqs_in[54]) if (!dqs_in[54]) dqs_pos_timing_check(54);
always @(negedge dqs_in[55]) if (!dqs_in[55]) dqs_pos_timing_check(55);
always @(negedge dqs_in[56]) if (!dqs_in[56]) dqs_pos_timing_check(56);
always @(negedge dqs_in[57]) if (!dqs_in[57]) dqs_pos_timing_check(57);
always @(negedge dqs_in[58]) if (!dqs_in[58]) dqs_pos_timing_check(58);
always @(negedge dqs_in[59]) if (!dqs_in[59]) dqs_pos_timing_check(59);
always @(negedge dqs_in[60]) if (!dqs_in[60]) dqs_pos_timing_check(60);
always @(negedge dqs_in[61]) if (!dqs_in[61]) dqs_pos_timing_check(61);
always @(negedge dqs_in[62]) if (!dqs_in[62]) dqs_pos_timing_check(62);
always @(negedge dqs_in[63]) if (!dqs_in[63]) dqs_pos_timing_check(63);
task dqs_neg_timing_check;
input i;
reg [5:0] i;
reg [4:0] j;
begin
if (write_levelization && i<32) begin
if (ck_cntr - ck_load_mode < TWLDQSEN)
$display ("%m: at time %t ERROR: tWLDQSEN violation on DQS bit %d.", $time, i);
if ($time - tm_dqs_pos[i] < $rtoi(TDQSH*tck_avg))
$display ("%m: at time %t ERROR: tDQSH violation on DQS bit %d by %t", $time, i, tm_dqs_pos[i] + TDQSH*tck_avg - $time);
end
if (dqs_in_valid && (wdqs_pos_cntr[i] > 0) && check_write_dqs_high[i]) begin
if (dqs_in[i] ^ prev_dqs_in[i]) begin
if (dll_locked) begin
if ($time - tm_dqs_pos[i] < $rtoi(TDQSH*tck_avg))
$display ("%m: at time %t ERROR: tDQSH violation on %s bit %d", $time, dqs_string[i/32], i%32);
if ($time - tm_ck_pos < $rtoi(TDSH*tck_avg))
$display ("%m: at time %t ERROR: tDSH violation on %s bit %d", $time, dqs_string[i/32], i%32);
end
if ($time - tm_dm[i%32] < TDS)
$display ("%m: at time %t ERROR: tDS violation on DM bit %d by %t", $time, i, tm_dm[i%32] + TDS - $time);
if (!dq_out_en) begin
for (j=0; j<`DQ_PER_DQS; j=j+1) begin
if ($time - tm_dq[(i%32)*`DQ_PER_DQS+j] < TDS)
$display ("%m: at time %t ERROR: tDS violation on DQ bit %d by %t", $time, i*`DQ_PER_DQS+j, tm_dq[(i%32)*`DQ_PER_DQS+j] + TDS - $time);
check_dq_tdipw[(i%32)*`DQ_PER_DQS+j] <= 1'b1;
end
end
check_dm_tdipw[i%32] <= 1'b1;
tm_dqs[i%32] <= $time;
end else begin
$display ("%m: at time %t ERROR: Invalid latching edge on %s bit %d", $time, dqs_string[i/32], i%32);
end
end
check_write_dqs_high[i] <= 1'b0;
tm_dqs_neg[i] = $time;
prev_dqs_in[i] <= dqs_in[i];
end
endtask
always @(negedge dqs_in[ 0]) if (!dqs_in[ 0]) dqs_neg_timing_check( 0);
always @(negedge dqs_in[ 1]) if (!dqs_in[ 1]) dqs_neg_timing_check( 1);
always @(negedge dqs_in[ 2]) if (!dqs_in[ 2]) dqs_neg_timing_check( 2);
always @(negedge dqs_in[ 3]) if (!dqs_in[ 3]) dqs_neg_timing_check( 3);
always @(negedge dqs_in[ 4]) if (!dqs_in[ 4]) dqs_neg_timing_check( 4);
always @(negedge dqs_in[ 5]) if (!dqs_in[ 5]) dqs_neg_timing_check( 5);
always @(negedge dqs_in[ 6]) if (!dqs_in[ 6]) dqs_neg_timing_check( 6);
always @(negedge dqs_in[ 7]) if (!dqs_in[ 7]) dqs_neg_timing_check( 7);
always @(negedge dqs_in[ 8]) if (!dqs_in[ 8]) dqs_neg_timing_check( 8);
always @(negedge dqs_in[ 9]) if (!dqs_in[ 9]) dqs_neg_timing_check( 9);
always @(negedge dqs_in[10]) if (!dqs_in[10]) dqs_neg_timing_check(10);
always @(negedge dqs_in[11]) if (!dqs_in[11]) dqs_neg_timing_check(11);
always @(negedge dqs_in[12]) if (!dqs_in[12]) dqs_neg_timing_check(12);
always @(negedge dqs_in[13]) if (!dqs_in[13]) dqs_neg_timing_check(13);
always @(negedge dqs_in[14]) if (!dqs_in[14]) dqs_neg_timing_check(14);
always @(negedge dqs_in[15]) if (!dqs_in[15]) dqs_neg_timing_check(15);
always @(negedge dqs_in[16]) if (!dqs_in[16]) dqs_neg_timing_check(16);
always @(negedge dqs_in[17]) if (!dqs_in[17]) dqs_neg_timing_check(17);
always @(negedge dqs_in[18]) if (!dqs_in[18]) dqs_neg_timing_check(18);
always @(negedge dqs_in[19]) if (!dqs_in[19]) dqs_neg_timing_check(19);
always @(negedge dqs_in[20]) if (!dqs_in[20]) dqs_neg_timing_check(20);
always @(negedge dqs_in[21]) if (!dqs_in[21]) dqs_neg_timing_check(21);
always @(negedge dqs_in[22]) if (!dqs_in[22]) dqs_neg_timing_check(22);
always @(negedge dqs_in[23]) if (!dqs_in[23]) dqs_neg_timing_check(23);
always @(negedge dqs_in[24]) if (!dqs_in[24]) dqs_neg_timing_check(24);
always @(negedge dqs_in[25]) if (!dqs_in[25]) dqs_neg_timing_check(25);
always @(negedge dqs_in[26]) if (!dqs_in[26]) dqs_neg_timing_check(26);
always @(negedge dqs_in[27]) if (!dqs_in[27]) dqs_neg_timing_check(27);
always @(negedge dqs_in[28]) if (!dqs_in[28]) dqs_neg_timing_check(28);
always @(negedge dqs_in[29]) if (!dqs_in[29]) dqs_neg_timing_check(29);
always @(negedge dqs_in[30]) if (!dqs_in[30]) dqs_neg_timing_check(30);
always @(negedge dqs_in[31]) if (!dqs_in[31]) dqs_neg_timing_check(31);
always @(posedge dqs_in[32]) if ( dqs_in[32]) dqs_neg_timing_check(32);
always @(posedge dqs_in[33]) if ( dqs_in[33]) dqs_neg_timing_check(33);
always @(posedge dqs_in[34]) if ( dqs_in[34]) dqs_neg_timing_check(34);
always @(posedge dqs_in[35]) if ( dqs_in[35]) dqs_neg_timing_check(35);
always @(posedge dqs_in[36]) if ( dqs_in[36]) dqs_neg_timing_check(36);
always @(posedge dqs_in[37]) if ( dqs_in[37]) dqs_neg_timing_check(37);
always @(posedge dqs_in[38]) if ( dqs_in[38]) dqs_neg_timing_check(38);
always @(posedge dqs_in[39]) if ( dqs_in[39]) dqs_neg_timing_check(39);
always @(posedge dqs_in[40]) if ( dqs_in[40]) dqs_neg_timing_check(40);
always @(posedge dqs_in[41]) if ( dqs_in[41]) dqs_neg_timing_check(41);
always @(posedge dqs_in[42]) if ( dqs_in[42]) dqs_neg_timing_check(42);
always @(posedge dqs_in[43]) if ( dqs_in[43]) dqs_neg_timing_check(43);
always @(posedge dqs_in[44]) if ( dqs_in[44]) dqs_neg_timing_check(44);
always @(posedge dqs_in[45]) if ( dqs_in[45]) dqs_neg_timing_check(45);
always @(posedge dqs_in[46]) if ( dqs_in[46]) dqs_neg_timing_check(46);
always @(posedge dqs_in[47]) if ( dqs_in[47]) dqs_neg_timing_check(47);
always @(posedge dqs_in[48]) if ( dqs_in[48]) dqs_neg_timing_check(48);
always @(posedge dqs_in[49]) if ( dqs_in[49]) dqs_neg_timing_check(49);
always @(posedge dqs_in[50]) if ( dqs_in[50]) dqs_neg_timing_check(50);
always @(posedge dqs_in[51]) if ( dqs_in[51]) dqs_neg_timing_check(51);
always @(posedge dqs_in[52]) if ( dqs_in[52]) dqs_neg_timing_check(52);
always @(posedge dqs_in[53]) if ( dqs_in[53]) dqs_neg_timing_check(53);
always @(posedge dqs_in[54]) if ( dqs_in[54]) dqs_neg_timing_check(54);
always @(posedge dqs_in[55]) if ( dqs_in[55]) dqs_neg_timing_check(55);
always @(posedge dqs_in[56]) if ( dqs_in[56]) dqs_neg_timing_check(56);
always @(posedge dqs_in[57]) if ( dqs_in[57]) dqs_neg_timing_check(57);
always @(posedge dqs_in[58]) if ( dqs_in[58]) dqs_neg_timing_check(58);
always @(posedge dqs_in[59]) if ( dqs_in[59]) dqs_neg_timing_check(59);
always @(posedge dqs_in[60]) if ( dqs_in[60]) dqs_neg_timing_check(60);
always @(posedge dqs_in[61]) if ( dqs_in[61]) dqs_neg_timing_check(61);
always @(posedge dqs_in[62]) if ( dqs_in[62]) dqs_neg_timing_check(62);
always @(posedge dqs_in[63]) if ( dqs_in[63]) dqs_neg_timing_check(63);
endmodule
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