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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, 2012 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;
// Test:
tri t;
bufif1 (t, crc[1], cyc[1:0]==2'b00);
bufif1 (t, crc[2], cyc[1:0]==2'b10);
tri0 t0;
bufif1 (t0, crc[1], cyc[1:0]==2'b00);
bufif1 (t0, crc[2], cyc[1:0]==2'b10);
tri1 t1;
bufif1 (t1, crc[1], cyc[1:0]==2'b00);
bufif1 (t1, crc[2], cyc[1:0]==2'b10);
tri t2;
t_tri2 t_tri2 (.t2, .d(crc[1]), .oe(cyc[1:0]==2'b00));
bufif1 (t2, crc[2], cyc[1:0]==2'b10);
tri t3;
t_tri3 t_tri3 (.t3, .d(crc[1]), .oe(cyc[1:0]==2'b00));
bufif1 (t3, crc[2], cyc[1:0]==2'b10);
wire [63:0] result = {51'h0, t3, 3'h0,t2, 3'h0,t1, 3'h0,t0};
// 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 <= 64'h0;
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;
// What checksum will we end up with (above print should match)
`define EXPECTED_SUM 64'h04f91df71371e950
if (sum !== `EXPECTED_SUM) $stop;
$write("*-* All Finished *-*\n");
$finish;
end
end
endmodule
module t_tri2 (/*AUTOARG*/
// Outputs
t2,
// Inputs
d, oe
);
output t2;
input d;
input oe;
tri1 t2;
bufif1 (t2, d, oe);
endmodule
module t_tri3 (/*AUTOARG*/
// Outputs
t3,
// Inputs
d, oe
);
output tri1 t3;
input d;
input oe;
bufif1 (t3, d, oe);
endmodule
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