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// This is free and unencumbered software released into the public domain. | ||
// | ||
// Anyone is free to copy, modify, publish, use, compile, sell, or | ||
// distribute this software, either in source code form or as a compiled | ||
// binary, for any purpose, commercial or non-commercial, and by any | ||
// means. | ||
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`timescale 1 ns / 1 ps | ||
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module testbench; | ||
reg clk = 1; | ||
reg resetn = 0; | ||
wire trap; | ||
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always #5 clk = ~clk; | ||
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initial begin | ||
if ($test$plusargs("vcd")) begin | ||
$dumpfile("testbench.vcd"); | ||
$dumpvars(0, testbench); | ||
end | ||
repeat (100) @(posedge clk); | ||
resetn <= 1; | ||
repeat (1000) @(posedge clk); | ||
$finish; | ||
end | ||
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wire mem_valid; | ||
wire mem_instr; | ||
reg mem_ready; | ||
wire [31:0] mem_addr; | ||
wire [31:0] mem_wdata; | ||
wire [3:0] mem_wstrb; | ||
reg [31:0] mem_rdata; | ||
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always @(posedge clk) begin | ||
if (mem_valid && mem_ready) begin | ||
if (mem_instr) | ||
$display("ifetch 0x%08x: 0x%08x", mem_addr, mem_rdata); | ||
else if (mem_wstrb) | ||
$display("write 0x%08x: 0x%08x (wstrb=%b)", mem_addr, mem_wdata, mem_wstrb); | ||
else | ||
$display("read 0x%08x: 0x%08x", mem_addr, mem_rdata); | ||
end | ||
end | ||
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picorv32 #( | ||
) uut ( | ||
.clk (clk ), | ||
.resetn (resetn ), | ||
.trap (trap ), | ||
.mem_valid (mem_valid ), | ||
.mem_instr (mem_instr ), | ||
.mem_ready (mem_ready ), | ||
.mem_addr (mem_addr ), | ||
.mem_wdata (mem_wdata ), | ||
.mem_wstrb (mem_wstrb ), | ||
.mem_rdata (mem_rdata ) | ||
); | ||
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reg [31:0] memory [0:255]; | ||
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initial begin | ||
memory[0] = 32'h 3fc00093; // li x1,1020 | ||
memory[1] = 32'h 0000a023; // sw x0,0(x1) | ||
memory[2] = 32'h 0000a103; // loop: lw x2,0(x1) | ||
memory[3] = 32'h 00110113; // addi x2,x2,1 | ||
memory[4] = 32'h 0020a023; // sw x2,0(x1) | ||
memory[5] = 32'h ff5ff06f; // j <loop> | ||
end | ||
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always @(posedge clk) begin | ||
mem_ready <= 0; | ||
if (mem_valid && !mem_ready) begin | ||
if (mem_addr < 1024) begin | ||
mem_ready <= 1; | ||
mem_rdata <= memory[mem_addr >> 2]; | ||
if (mem_wstrb[0]) memory[mem_addr >> 2][ 7: 0] <= mem_wdata[ 7: 0]; | ||
if (mem_wstrb[1]) memory[mem_addr >> 2][15: 8] <= mem_wdata[15: 8]; | ||
if (mem_wstrb[2]) memory[mem_addr >> 2][23:16] <= mem_wdata[23:16]; | ||
if (mem_wstrb[3]) memory[mem_addr >> 2][31:24] <= mem_wdata[31:24]; | ||
end | ||
/* add memory-mapped IO here */ | ||
end | ||
end | ||
endmodule |
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