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Improved AXI Interface Testbench

This commit is contained in:
Clifford Wolf 2015-06-06 17:15:09 +02:00
parent 77ba5a1897
commit 7fd24a96b2
2 changed files with 114 additions and 39 deletions
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4
picorv32.v
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@ -819,8 +819,8 @@ module picorv32_axi_adapter (
assign mem_axi_wstrb = mem_wstrb;
assign mem_ready = mem_axi_bvalid || mem_axi_rvalid;
assign mem_axi_bready = mem_valid;
assign mem_axi_rready = mem_valid;
assign mem_axi_bready = mem_valid && |mem_wstrb;
assign mem_axi_rready = mem_valid && !mem_wstrb;
assign mem_rdata = mem_axi_rdata;
always @(posedge clk) begin

149
testbench.v
View File

@ -74,60 +74,135 @@ module testbench;
end
endtask
reg delay_axi_transaction = 0;
reg [2:0] fast_axi_transaction = ~0;
reg [4:0] delay_axi_transaction = 0;
`ifdef RANDOM_AXI_DELAYS
always @(posedge clk) begin
xorshift64_next;
delay_axi_transaction <= xorshift64_state[0];
{fast_axi_transaction, delay_axi_transaction} <= xorshift64_state;
end
`endif
reg latched_raddr_en = 0;
reg latched_waddr_en = 0;
reg latched_wdata_en = 0;
reg fast_raddr = 0;
reg fast_waddr = 0;
reg fast_wdata = 0;
reg [31:0] latched_raddr;
reg [31:0] latched_waddr;
reg [31:0] latched_wdata;
reg [ 3:0] latched_wstrb;
reg latched_rinsn;
always @(posedge clk) begin
mem_axi_arready <= 0;
mem_axi_awready <= 0;
mem_axi_wready <= 0;
mem_axi_arready <= 0;
if (!mem_axi_bvalid || mem_axi_bready) begin
fast_raddr <= 0;
fast_waddr <= 0;
fast_wdata <= 0;
if (mem_axi_rvalid && mem_axi_rready) begin
mem_axi_rvalid <= 0;
end
if (mem_axi_bvalid && mem_axi_bready) begin
mem_axi_bvalid <= 0;
if (mem_axi_awvalid && mem_axi_wvalid && !mem_axi_awready && !mem_axi_wready && !delay_axi_transaction) begin
`ifdef VERBOSE
$display("WR: ADDR=%08x DATA=%08x STRB=%04b", mem_axi_awaddr, mem_axi_wdata, mem_axi_wstrb);
`endif
if (mem_axi_awaddr < 64*1024) begin
if (mem_axi_wstrb[0]) memory[mem_axi_awaddr >> 2][ 7: 0] <= mem_axi_wdata[ 7: 0];
if (mem_axi_wstrb[1]) memory[mem_axi_awaddr >> 2][15: 8] <= mem_axi_wdata[15: 8];
if (mem_axi_wstrb[2]) memory[mem_axi_awaddr >> 2][23:16] <= mem_axi_wdata[23:16];
if (mem_axi_wstrb[3]) memory[mem_axi_awaddr >> 2][31:24] <= mem_axi_wdata[31:24];
end
if (mem_axi_awaddr == 32'h1000_0000) begin
`ifdef VERBOSE
if (32 <= mem_axi_wdata && mem_axi_wdata < 128)
$display("OUT: '%c'", mem_axi_wdata);
else
$display("OUT: %3d", mem_axi_wdata);
`else
$write("%c", mem_axi_wdata);
$fflush();
`endif
end
mem_axi_awready <= 1;
mem_axi_wready <= 1;
mem_axi_bvalid <= 1;
end
if (mem_axi_arvalid && mem_axi_arready && !fast_raddr) begin
latched_raddr = mem_axi_araddr;
latched_rinsn = mem_axi_arprot[2];
latched_raddr_en = 1;
end
if (mem_axi_awvalid && mem_axi_awready && !fast_waddr) begin
latched_waddr = mem_axi_awaddr;
latched_waddr_en = 1;
end
if (mem_axi_wvalid && mem_axi_wready && !fast_wdata) begin
latched_wdata = mem_axi_wdata;
latched_wstrb = mem_axi_wstrb;
latched_wdata_en = 1;
end
if (mem_axi_arvalid && !(latched_raddr_en || fast_raddr) && !delay_axi_transaction[0]) begin
mem_axi_arready <= 1;
if (fast_axi_transaction[0]) begin
fast_raddr <= 1;
latched_raddr = mem_axi_araddr;
latched_rinsn = mem_axi_arprot[2];
latched_raddr_en = 1;
end
end
if (!mem_axi_rvalid || mem_axi_rready) begin
mem_axi_rvalid <= 0;
if (mem_axi_arvalid && !mem_axi_arready && !delay_axi_transaction) begin
`ifdef VERBOSE
$display("RD: ADDR=%08x DATA=%08x", mem_axi_araddr, memory[mem_axi_araddr >> 2]);
`endif
mem_axi_arready <= 1;
mem_axi_rdata <= memory[mem_axi_araddr >> 2];
mem_axi_rvalid <= 1;
if (mem_axi_awvalid && !(latched_waddr_en || fast_waddr) && !delay_axi_transaction[1]) begin
mem_axi_awready <= 1;
if (fast_axi_transaction[1]) begin
fast_waddr <= 1;
latched_waddr = mem_axi_awaddr;
latched_waddr_en = 1;
end
end
if (mem_axi_wvalid && !(latched_wdata_en || fast_wdata) && !delay_axi_transaction[2]) begin
mem_axi_wready <= 1;
if (fast_axi_transaction[2]) begin
fast_wdata <= 1;
latched_wdata = mem_axi_wdata;
latched_wstrb = mem_axi_wstrb;
latched_wdata_en = 1;
end
end
if (!mem_axi_rvalid && latched_raddr_en && !delay_axi_transaction[3]) begin
`ifdef VERBOSE
$display("RD: ADDR=%08x DATA=%08x%s", latched_raddr, memory[latched_raddr >> 2], latched_rinsn ? " INSN" : "");
`endif
if (latched_raddr < 64*1024) begin
mem_axi_rdata <= memory[latched_raddr >> 2];
mem_axi_rvalid <= 1;
latched_raddr_en = 0;
end else begin
$display("OUT-OF-BOUNDS MEMORY READ FROM %08x", latched_raddr);
$finish;
end
end
if (!mem_axi_bvalid && latched_waddr_en && latched_wdata_en && !delay_axi_transaction[4]) begin
`ifdef VERBOSE
$display("WR: ADDR=%08x DATA=%08x STRB=%04b", latched_waddr, latched_wdata, latched_wstrb);
`endif
if (latched_waddr < 64*1024) begin
if (latched_wstrb[0]) memory[latched_waddr >> 2][ 7: 0] <= latched_wdata[ 7: 0];
if (latched_wstrb[1]) memory[latched_waddr >> 2][15: 8] <= latched_wdata[15: 8];
if (latched_wstrb[2]) memory[latched_waddr >> 2][23:16] <= latched_wdata[23:16];
if (latched_wstrb[3]) memory[latched_waddr >> 2][31:24] <= latched_wdata[31:24];
end else
if (latched_waddr == 32'h1000_0000) begin
`ifdef VERBOSE
if (32 <= latched_wdata && latched_wdata < 128)
$display("OUT: '%c'", latched_wdata);
else
$display("OUT: %3d", latched_wdata);
`else
$write("%c", latched_wdata);
$fflush();
`endif
end else begin
$display("OUT-OF-BOUNDS MEMORY WRITE TO %08x", latched_waddr);
$finish;
end
mem_axi_bvalid <= 1;
latched_waddr_en = 0;
latched_wdata_en = 0;
end
end
initial begin