verilator/test_regress/t/t_func_outp.v

108 lines
1.6 KiB
Systemverilog

// DESCRIPTION: Verilator: Verilog Test module
//
// This file ONLY is placed under the Creative Commons Public Domain.
// SPDX-FileCopyrightText: 2003 Wilson Snyder
// SPDX-License-Identifier: CC0-1.0
module t (
input clk
);
reg [7:0] a, b;
wire [7:0] z;
mytop u0 (
a,
b,
clk,
z
);
integer cyc;
initial cyc = 1;
always @(posedge clk) begin
if (cyc != 0) begin
cyc <= cyc + 1;
//$write("%d %x\n", cyc, z);
if (cyc == 1) begin
a <= 8'h07;
b <= 8'h20;
end
if (cyc == 2) begin
a <= 8'h8a;
b <= 8'h12;
end
if (cyc == 3) begin
if (z !== 8'hdf) $stop;
a <= 8'h71;
b <= 8'hb2;
end
if (cyc == 4) begin
if (z !== 8'hed) $stop;
end
if (cyc == 5) begin
if (z !== 8'h4d) $stop;
end
if (cyc == 9) begin
$write("*-* All Finished *-*\n");
$finish;
end
end
end
endmodule // mytop
module inv (
input [7:0] a,
output wire [7:0] z
);
assign z = ~a;
endmodule
module ftest (
input [7:0] a,
b, // Test legal syntax
input clk,
output reg [7:0] z
);
wire [7:0] zi;
inv u1 (
.a(myadd(a, b)),
.z(zi)
);
always @(posedge clk) begin
z <= myadd(a, zi);
end
function [7:0] myadd;
input [7:0] ina;
input [7:0] inb;
begin
myadd = ina + inb;
end
endfunction // myadd
endmodule // ftest
module mytop (
input [7:0] a,
b,
input clk,
output [7:0] z
);
ftest u0 (
a,
b,
clk,
z
);
endmodule // mytop