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// DESCRIPTION: Verilator: Verilog Test module
//
// This file ONLY is placed under the Creative Commons Public Domain, for
// any use, without warranty, 2008 by Wilson Snyder.
// 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 [1:0] in = crc[1:0];
/*AUTOWIRE*/
// Beginning of automatic wires (for undeclared instantiated-module outputs)
wire [1:0] out; // From test of Test.v
// End of automatics
Test test (/*AUTOINST*/
// Outputs
.out (out[1:0]),
// Inputs
.in (in[1:0]));
// Aggregate outputs into a single result vector
wire [63:0] result = {62'h0, out};
// What checksum will we end up with
`define EXPECTED_SUM 64'hbb2d9709592f64bd
// 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;
end
else if (cyc<10) begin
sum <= 64'h0;
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;
if (sum !== `EXPECTED_SUM) $stop;
$write("*-* All Finished *-*\n");
$finish;
end
end
endmodule
module Test (/*AUTOARG*/
// Outputs
out,
// Inputs
in
);
input [1:0] in;
output reg [1:0] out;
always @* begin
// bug99: Internal Error: ../V3Ast.cpp:495: New node already linked?
case (in[1:0])
2'd0, 2'd1, 2'd2, 2'd3: begin
out = in;
end
endcase
end
endmodule
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