1
0
mirror of https://github.com/sehugg/8bitworkshop.git synced 2024-12-23 03:29:39 +00:00
8bitworkshop/test/cli/verilog/t_EXAMPLE.v

98 lines
2.6 KiB
Verilog

// 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, 2021 by ____YOUR_NAME_HERE____.
// SPDX-License-Identifier: CC0-1.0
module t(/*AUTOARG*/
// Inputs
clk
);
input clk;
integer cyc=0;
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);
if (crc !== 64'hc77bb9b3784ea091) $stop;
// What checksum will we end up with (above print should match)
`define EXPECTED_SUM 64'h4afe43fb79d7b71e
if (sum !== `EXPECTED_SUM) $stop;
$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