mirror of https://github.com/YosysHQ/picorv32.git
Added Pico Co-Processor Interface (PCPI)
This commit is contained in:
parent
d4331491a8
commit
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2
Makefile
2
Makefile
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@ -1,6 +1,6 @@
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TEST_OBJS = $(addsuffix .o,$(basename $(wildcard tests/*.S)))
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FIRMWARE_OBJS = firmware/start.o firmware/irq.o firmware/print.o firmware/sieve.o firmware/stats.o
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FIRMWARE_OBJS = firmware/start.o firmware/irq.o firmware/print.o firmware/sieve.o firmware/multest.o firmware/stats.o
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test: testbench.exe firmware/firmware.hex
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vvp -N testbench.exe
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@ -16,6 +16,13 @@ void print_hex(unsigned int val);
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// sieve.c
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void sieve();
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// multest.c
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uint32_t hard_mul(uint32_t a, uint32_t b);
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uint32_t hard_mulh(uint32_t a, uint32_t b);
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uint32_t hard_mulhsu(uint32_t a, uint32_t b);
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uint32_t hard_mulhu(uint32_t a, uint32_t b);
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void multest();
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// stats.c
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void stats();
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@ -0,0 +1,79 @@
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#include "firmware.h"
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uint32_t xorshift32() {
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static uint32_t x = 314159265;
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x ^= x << 13;
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x ^= x >> 17;
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x ^= x << 5;
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return x;
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}
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void multest()
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{
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int i;
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for (i = 0; i < 10; i++)
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{
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uint32_t a = xorshift32();
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uint32_t b = xorshift32();
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uint64_t au = a, bu = b;
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int64_t as = (int32_t)a, bs = (int32_t)b;
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print_str("input [");
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print_hex(as >> 32);
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print_str("] ");
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print_hex(a);
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print_str(" [");
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print_hex(bs >> 32);
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print_str("] ");
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print_hex(b);
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print_chr('\n');
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uint32_t h_mul, h_mulh, h_mulhsu, h_mulhu;
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print_str("hard ");
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h_mul = hard_mul(a, b);
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print_hex(h_mul);
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print_str(" ");
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h_mulh = hard_mulh(a, b);
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print_hex(h_mulh);
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print_str(" ");
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h_mulhsu = hard_mulhsu(a, b);
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print_hex(h_mulhsu);
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print_str(" ");
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h_mulhu = hard_mulhu(a, b);
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print_hex(h_mulhu);
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print_chr('\n');
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uint32_t s_mul, s_mulh, s_mulhsu, s_mulhu;
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print_str("soft ");
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s_mul = a * b;
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print_hex(s_mul);
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print_str(" ");
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s_mulh = (as * bs) >> 32;
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print_hex(s_mulh);
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print_str(" ");
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s_mulhsu = (as * bu) >> 32;
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print_hex(s_mulhsu);
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print_str(" ");
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s_mulhu = (au * bu) >> 32;
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print_hex(s_mulhu);
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print_str(" ");
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if (s_mul != h_mul || s_mulh != h_mulh || s_mulhsu != h_mulhsu || s_mulhu != h_mulhu) {
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print_str("ERROR!\n");
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asm volatile ("sbreak");
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return;
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}
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print_str(" OK\n");
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}
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}
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@ -1,6 +1,11 @@
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.section .text
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.global irq
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.global sieve
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.global multest
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.global hard_mul
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.global hard_mulh
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.global hard_mulhsu
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.global hard_mulhu
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.global stats
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#define TEST(n) \
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@ -220,6 +225,9 @@ start:
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/* jump to sieve C code */
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jal ra,sieve
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/* jump to sieve C code */
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jal ra,multest
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/* jump to stats C code */
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jal ra,stats
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@ -239,3 +247,19 @@ start:
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/* break */
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sbreak
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hard_mul:
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mul a0, a0, a1
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ret
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hard_mulh:
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mulh a0, a0, a1
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ret
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hard_mulhsu:
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mulhsu a0, a0, a1
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ret
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hard_mulhu:
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mulhu a0, a0, a1
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ret
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219
picorv32.v
219
picorv32.v
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@ -30,6 +30,7 @@ module picorv32 #(
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parameter [ 0:0] ENABLE_REGS_16_31 = 1,
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parameter [ 0:0] ENABLE_REGS_DUALPORT = 1,
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parameter [ 0:0] LATCHED_MEM_RDATA = 0,
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parameter [ 0:0] ENABLE_PCPI = 0,
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parameter [ 0:0] ENABLE_IRQ = 0,
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parameter [31:0] MASKED_IRQ = 32'h 0000_0000,
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parameter [31:0] PROGADDR_RESET = 32'h 0000_0000,
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@ -47,14 +48,25 @@ module picorv32 #(
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output reg [ 3:0] mem_wstrb,
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input [31:0] mem_rdata,
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// look-ahead interface
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// Look-Ahead Interface
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output mem_la_read,
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output mem_la_write,
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output [31:0] mem_la_addr,
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output reg [31:0] mem_la_wdata,
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output reg [ 3:0] mem_la_wstrb,
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// IRQ interface
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// Pico Co-Processor Interface (PCPI)
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output reg pcpi_insn_valid,
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output reg [31:0] pcpi_insn,
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output reg pcpi_rs1_valid,
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output [31:0] pcpi_rs1,
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output reg pcpi_rs2_valid,
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output [31:0] pcpi_rs2,
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input pcpi_rd_valid,
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input [31:0] pcpi_rd,
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input pcpi_ready,
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// IRQ Interface
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input [31:0] irq,
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output reg [31:0] eoi
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);
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@ -71,6 +83,9 @@ module picorv32 #(
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reg [31:0] cpuregs [0:regfile_size-1];
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reg [4:0] reg_sh;
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assign pcpi_rs1 = reg_op1;
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assign pcpi_rs2 = reg_op2;
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wire [31:0] next_pc;
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reg irq_active;
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@ -318,6 +333,10 @@ module picorv32 #(
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end
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if (decoder_trigger && !decoder_pseudo_trigger) begin
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if (ENABLE_PCPI) begin
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pcpi_insn <= mem_rdata_q;
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end
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instr_beq <= is_beq_bne_blt_bge_bltu_bgeu && mem_rdata_q[14:12] == 3'b000;
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instr_bne <= is_beq_bne_blt_bge_bltu_bgeu && mem_rdata_q[14:12] == 3'b001;
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instr_blt <= is_beq_bne_blt_bge_bltu_bgeu && mem_rdata_q[14:12] == 3'b100;
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@ -437,6 +456,9 @@ module picorv32 #(
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reg [31:0] current_pc;
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assign next_pc = latched_store && latched_branch ? reg_out : reg_next_pc;
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reg [7:0] pcpi_timeout_counter;
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reg pcpi_timeout;
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reg [31:0] next_irq_pending;
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reg do_waitirq;
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@ -489,6 +511,15 @@ module picorv32 #(
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reg_alu_out <= alu_out;
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if (ENABLE_PCPI) begin
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if (pcpi_insn_valid) begin
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if (pcpi_timeout_counter)
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pcpi_timeout_counter <= pcpi_timeout_counter - 1;
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end else
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pcpi_timeout_counter <= ~0;
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pcpi_timeout <= !pcpi_timeout_counter;
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end
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if (ENABLE_COUNTERS)
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count_cycle <= resetn ? count_cycle + 1 : 0;
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@ -520,6 +551,9 @@ module picorv32 #(
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latched_is_lu <= 0;
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latched_is_lh <= 0;
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latched_is_lb <= 0;
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pcpi_insn_valid <= 0;
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pcpi_rs1_valid <= 0;
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pcpi_rs2_valid <= 0;
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irq_active <= 0;
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irq_mask <= ~0;
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next_irq_pending = 0;
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@ -567,6 +601,12 @@ module picorv32 #(
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reg_pc <= current_pc;
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reg_next_pc <= current_pc;
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if (ENABLE_PCPI) begin
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pcpi_insn_valid <= 0;
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pcpi_rs1_valid <= 0;
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pcpi_rs2_valid <= 0;
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end
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latched_store <= 0;
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latched_stalu <= 0;
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latched_branch <= 0;
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@ -618,14 +658,42 @@ module picorv32 #(
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$display("DECODE: 0x%08x %-0s", reg_pc, instruction ? instruction : "UNKNOWN");
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`endif
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if (instr_trap) begin
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if (ENABLE_PCPI) begin
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pcpi_rs1_valid <= 1;
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pcpi_insn_valid <= 1;
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reg_op1 <= decoded_rs1 ? cpuregs[decoded_rs1] : 0;
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if (ENABLE_REGS_DUALPORT) begin
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pcpi_rs2_valid <= 1;
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reg_sh <= decoded_rs2 ? cpuregs[decoded_rs2] : 0;
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reg_op2 <= decoded_rs2 ? cpuregs[decoded_rs2] : 0;
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if (pcpi_ready) begin
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reg_out <= pcpi_rd;
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latched_store <= pcpi_rd_valid;
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cpu_state <= cpu_state_fetch;
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end else
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if (pcpi_timeout) begin
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`ifdef DEBUG
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$display("SBREAK OR UNSUPPORTED INSN AT 0x%08x", reg_pc);
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$display("SBREAK OR UNSUPPORTED INSN AT 0x%08x", reg_pc);
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`endif
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if (ENABLE_IRQ && !irq_mask[irq_sbreak] && !irq_active) begin
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next_irq_pending[irq_sbreak] = 1;
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cpu_state <= cpu_state_fetch;
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end else
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cpu_state <= cpu_state_trap;
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if (ENABLE_IRQ && !irq_mask[irq_sbreak] && !irq_active) begin
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next_irq_pending[irq_sbreak] = 1;
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cpu_state <= cpu_state_fetch;
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end else
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cpu_state <= cpu_state_trap;
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end
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end else begin
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cpu_state <= cpu_state_ld_rs2;
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end
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end else begin
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`ifdef DEBUG
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$display("SBREAK OR UNSUPPORTED INSN AT 0x%08x", reg_pc);
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`endif
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if (ENABLE_IRQ && !irq_mask[irq_sbreak] && !irq_active) begin
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next_irq_pending[irq_sbreak] = 1;
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cpu_state <= cpu_state_fetch;
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end else
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cpu_state <= cpu_state_trap;
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end
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end else
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if (is_rdcycle_rdcycleh_rdinstr_rdinstrh) begin
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(* parallel_case, full_case *)
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@ -718,6 +786,24 @@ module picorv32 #(
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`endif
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reg_sh <= decoded_rs2 ? cpuregs[decoded_rs2] : 0;
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reg_op2 <= decoded_rs2 ? cpuregs[decoded_rs2] : 0;
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if (ENABLE_PCPI && pcpi_insn_valid) begin
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pcpi_rs2_valid <= 1;
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if (pcpi_ready) begin
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reg_out <= pcpi_rd;
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latched_store <= pcpi_rd_valid;
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cpu_state <= cpu_state_fetch;
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end else
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if (pcpi_timeout) begin
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`ifdef DEBUG
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$display("SBREAK OR UNSUPPORTED INSN AT 0x%08x", reg_pc);
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`endif
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if (ENABLE_IRQ && !irq_mask[irq_sbreak] && !irq_active) begin
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next_irq_pending[irq_sbreak] = 1;
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cpu_state <= cpu_state_fetch;
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end else
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cpu_state <= cpu_state_trap;
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end
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end else
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if (is_sb_sh_sw) begin
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cpu_state <= cpu_state_stmem;
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mem_do_rinst <= 1;
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@ -874,6 +960,70 @@ module picorv32 #(
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endmodule
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/***************************************************************
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* picorv32_pcpi_mul
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***************************************************************/
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module picorv32_pcpi_mul (
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input clk, resetn,
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input pcpi_insn_valid,
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input [31:0] pcpi_insn,
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input pcpi_rs1_valid,
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input [31:0] pcpi_rs1,
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input pcpi_rs2_valid,
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input [31:0] pcpi_rs2,
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output reg pcpi_rd_valid,
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output reg [31:0] pcpi_rd,
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output reg pcpi_ready
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);
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reg instr_mul, instr_mulh, instr_mulhsu, instr_mulhu;
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wire instr_any_mul = |{instr_mul, instr_mulh, instr_mulhsu, instr_mulhu};
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wire instr_any_mulh = |{instr_mulh, instr_mulhsu, instr_mulhu};
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wire instr_rs1_signed = |{instr_mulh, instr_mulhsu};
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wire instr_rs2_signed = |{instr_mulh};
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always @(posedge clk) begin
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instr_mul <= 0;
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instr_mulh <= 0;
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instr_mulhsu <= 0;
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instr_mulhu <= 0;
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if (pcpi_insn_valid && pcpi_insn[6:0] == 7'b0110011 && pcpi_insn[31:25] == 7'b0000001) begin
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case (pcpi_insn[14:12])
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3'b000: instr_mul <= 1;
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3'b001: instr_mulh <= 1;
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3'b010: instr_mulhsu <= 1;
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3'b011: instr_mulhu <= 1;
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endcase
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end
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end
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// FIXME: This is just a behavioral model
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reg [63:0] rs1, rs2;
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always @(posedge clk) begin
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pcpi_rd_valid <= 0;
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pcpi_ready <= 0;
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if (pcpi_rs1_valid && pcpi_rs2_valid && instr_any_mul) begin
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if (instr_rs1_signed)
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rs1 = $signed(pcpi_rs1);
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else
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rs1 = $unsigned(pcpi_rs1);
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if (instr_rs2_signed)
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rs2 = $signed(pcpi_rs2);
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else
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rs2 = $unsigned(pcpi_rs2);
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pcpi_rd <= instr_any_mulh ? (rs1 * rs2) >> 32 : rs1 * rs2;
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pcpi_rd_valid <= 1;
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pcpi_ready <= 1;
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end
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end
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endmodule
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/***************************************************************
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* picorv32_axi
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***************************************************************/
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@ -882,6 +1032,7 @@ module picorv32_axi #(
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parameter [ 0:0] ENABLE_COUNTERS = 1,
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parameter [ 0:0] ENABLE_REGS_16_31 = 1,
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parameter [ 0:0] ENABLE_REGS_DUALPORT = 1,
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parameter [ 0:0] ENABLE_MUL = 0,
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parameter [ 0:0] ENABLE_IRQ = 0,
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parameter [31:0] MASKED_IRQ = 32'h 0000_0000,
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parameter [31:0] PROGADDR_RESET = 32'h 0000_0000,
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@ -926,6 +1077,16 @@ module picorv32_axi #(
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wire mem_ready;
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wire [31:0] mem_rdata;
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wire pcpi_insn_valid;
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wire [31:0] pcpi_insn;
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wire pcpi_rs1_valid;
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wire [31:0] pcpi_rs1;
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wire pcpi_rs2_valid;
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wire [31:0] pcpi_rs2;
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wire pcpi_rd_valid;
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wire [31:0] pcpi_rd;
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wire pcpi_ready;
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picorv32_axi_adapter axi_adapter (
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.clk (clk ),
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.resetn (resetn ),
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@ -955,18 +1116,39 @@ module picorv32_axi #(
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.mem_rdata (mem_rdata )
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);
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generate if (ENABLE_MUL) begin
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picorv32_pcpi_mul pcpi_mul (
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.clk (clk ),
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.resetn (resetn ),
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.pcpi_insn_valid(pcpi_insn_valid),
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.pcpi_insn (pcpi_insn ),
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.pcpi_rs1_valid (pcpi_rs1_valid ),
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.pcpi_rs1 (pcpi_rs1 ),
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.pcpi_rs2_valid (pcpi_rs2_valid ),
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.pcpi_rs2 (pcpi_rs2 ),
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.pcpi_rd_valid (pcpi_rd_valid ),
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.pcpi_rd (pcpi_rd ),
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.pcpi_ready (pcpi_ready )
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);
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end else begin
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assign pcpi_rd = 1'bx;
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assign pcpi_ready = 0;
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end endgenerate
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picorv32 #(
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.ENABLE_COUNTERS (ENABLE_COUNTERS ),
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.ENABLE_REGS_16_31 (ENABLE_REGS_16_31 ),
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.ENABLE_REGS_DUALPORT(ENABLE_REGS_DUALPORT),
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.ENABLE_PCPI (ENABLE_MUL ),
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.ENABLE_IRQ (ENABLE_IRQ ),
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.MASKED_IRQ (MASKED_IRQ ),
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.PROGADDR_RESET (PROGADDR_RESET ),
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.PROGADDR_IRQ (PROGADDR_IRQ )
|
||||
) picorv32_core (
|
||||
.clk (clk ),
|
||||
.resetn (resetn ),
|
||||
.trap (trap ),
|
||||
.clk (clk ),
|
||||
.resetn (resetn),
|
||||
.trap (trap ),
|
||||
|
||||
.mem_valid(mem_valid),
|
||||
.mem_addr (mem_addr ),
|
||||
.mem_wdata(mem_wdata),
|
||||
|
@ -974,8 +1156,19 @@ module picorv32_axi #(
|
|||
.mem_instr(mem_instr),
|
||||
.mem_ready(mem_ready),
|
||||
.mem_rdata(mem_rdata),
|
||||
.irq (irq ),
|
||||
.eoi (eoi )
|
||||
|
||||
.pcpi_insn_valid(pcpi_insn_valid),
|
||||
.pcpi_insn (pcpi_insn ),
|
||||
.pcpi_rs1_valid (pcpi_rs1_valid ),
|
||||
.pcpi_rs1 (pcpi_rs1 ),
|
||||
.pcpi_rs2_valid (pcpi_rs2_valid ),
|
||||
.pcpi_rs2 (pcpi_rs2 ),
|
||||
.pcpi_rd_valid (pcpi_rd_valid ),
|
||||
.pcpi_rd (pcpi_rd ),
|
||||
.pcpi_ready (pcpi_ready ),
|
||||
|
||||
.irq(irq),
|
||||
.eoi(eoi)
|
||||
);
|
||||
endmodule
|
||||
|
||||
|
|
|
@ -45,6 +45,7 @@ module testbench;
|
|||
reg [31:0] mem_axi_rdata;
|
||||
|
||||
picorv32_axi #(
|
||||
.ENABLE_MUL(1),
|
||||
.ENABLE_IRQ(1)
|
||||
) uut (
|
||||
.clk (clk ),
|
||||
|
|
Loading…
Reference in New Issue