diff options
Diffstat (limited to 'scripts/torture/testbench.v')
-rw-r--r-- | scripts/torture/testbench.v | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/scripts/torture/testbench.v b/scripts/torture/testbench.v new file mode 100644 index 0000000..abc3027 --- /dev/null +++ b/scripts/torture/testbench.v @@ -0,0 +1,83 @@ +module testbench ( +`ifdef VERILATOR + input clk +`endif +); +`ifndef VERILATOR + reg clk = 1; + always #5 clk = ~clk; +`endif + reg resetn = 0; + wire trap; + + 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; + + 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 ) + ); + + reg [1023:0] hex_filename; + reg [1023:0] ref_filename; + + reg [31:0] memory [0:4095]; + reg [31:0] memory_ref [0:4095]; + integer i, errcount; + + initial begin + if ($value$plusargs("hex=%s", hex_filename)) $readmemh(hex_filename, memory); + if ($value$plusargs("ref=%s", ref_filename)) $readmemh(ref_filename, memory_ref); + // $dumpfile("testbench.vcd"); + // $dumpvars(0, testbench); + + repeat (10) @(posedge clk); + resetn <= 1; + end + + always @(posedge clk) begin + mem_ready <= 0; + mem_rdata <= 'bx; + + if (!trap || !resetn) begin + if (mem_valid && !mem_ready && resetn) begin + mem_ready <= 1; + if (mem_wstrb) begin + 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 else begin + mem_rdata <= memory[mem_addr >> 2]; + end + end + end else begin + errcount = 0; + for (i=0; i < 4096; i=i+1) begin + if (memory[i] !== memory_ref[i]) begin + $display("Signature check failed at %04x: mem=%08x ref=%08x", i << 2, memory[i], memory_ref[i]); + errcount = errcount + 1; + end + end + if (errcount) + $display("FAILED: Got %1d errors for %1s/%1s!", errcount, hex_filename, ref_filename); + else + $display("PASSED %1s/%1s.", hex_filename, ref_filename); + $finish; + end + end +endmodule |