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// DESCRIPTION: Verilator: Verilog Test module
//
// Use this file as a template for submitting bugs, etc.
// This module takes a single clock input, and should either
// $write("*-* All Finished *-*\n");
// $finish;
// on success, or $stop.
//
// The code as shown applies a random vector to the Test
// module, then calculates a CRC on the Test module's outputs.
//
// **If you do not wish for your code to be released to the public
// please note it here, otherwise:**
//
// This file ONLY is placed under the Creative Commons Public Domain, for
// any use, without warranty, 2025 by Wilson Snyder.
// SPDX-License-Identifier: CC0-1.0
`define stop $stop
`define checkh(gotv,expv) do if ((gotv) !== (expv)) begin $write("%%Error: %s:%0d: got=%0x exp=%0x (%s !== %s)\n", `__FILE__,`__LINE__, (gotv), (expv), `"gotv`", `"expv`"); `stop; end while(0);
`define checks(gotv,expv) do if ((gotv) != (expv)) begin $write("%%Error: %s:%0d: got='%s' exp='%s'\n", `__FILE__,`__LINE__, (gotv), (expv)); `stop; end while(0);
module t(/*AUTOARG*/
// Inputs
clk
);
input clk;
int cyc;
reg [63:0] crc;
reg [63:0] sum;
// Take CRC data and apply to testblock inputs
wire [31:0] in = crc[31:0];
/*AUTOWIRE*/
// Beginning of automatic wires (for undeclared instantiated-module outputs)
wire [31:0] out; // From test of Test.v
// End of automatics
Test test(/*AUTOINST*/
// Outputs
.out (out[31:0]),
// Inputs
.clk (clk),
.in (in[31:0]));
// Aggregate outputs into a single result vector
wire [63:0] result = {32'h0, out};
// Test loop
always @(posedge clk) begin
`ifdef TEST_VERBOSE
$write("[%0t] cyc==%0d crc=%x result=%x\n", $time, cyc, crc, result);
`endif
cyc <= cyc + 1;
crc <= {crc[62:0], crc[63] ^ crc[2] ^ crc[0]};
sum <= result ^ {sum[62:0], sum[63] ^ sum[2] ^ sum[0]};
if (cyc == 0) begin
// Setup
crc <= 64'h5aef0c8d_d70a4497;
sum <= '0;
end
else if (cyc < 10) begin
sum <= '0;
end
else if (cyc < 90) begin
end
else if (cyc == 99) begin
$write("[%0t] cyc==%0d crc=%x sum=%x\n", $time, cyc, crc, sum);
`checkh(crc, 64'hc77bb9b3784ea091);
// What checksum will we end up with (above print should match)
`checkh(sum, 64'h4afe43fb79d7b71e);
$write("*-* All Finished *-*\n");
$finish;
end
end
endmodule
module Test(/*AUTOARG*/
// Outputs
out,
// Inputs
clk, in
);
// Replace this module with the device under test.
//
// Change the code in the t module to apply values to the inputs and
// merge the output values into the result vector.
input clk;
input [31:0] in;
output reg [31:0] out;
always @(posedge clk) begin
out <= in;
end
endmodule
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