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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, 2009 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 [3:0] l_stop = crc[3:0];
wire [3:0] l_break = crc[7:4];
wire [3:0] l_continue = crc[11:8];
/*AUTOWIRE*/
wire [15:0] out0 = Test0(l_stop, l_break, l_continue);
wire [15:0] out1 = Test1(l_stop, l_break, l_continue);
wire [15:0] out2 = Test2(l_stop, l_break, l_continue);
wire [15:0] out3 = Test3(l_stop, l_break, l_continue);
// Aggregate outputs into a single result vector
wire [63:0] result = {out3,out2,out1,out0};
// 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
if (out0!==out1) $stop;
if (out0!==out2) $stop;
if (out0!==out3) $stop;
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'h293e9f9798e97da0
if (sum !== `EXPECTED_SUM) $stop;
$write("*-* All Finished *-*\n");
$finish;
end
end
function [15:0] Test0;
input [3:0] loop_stop;
input [3:0] loop_break;
input [3:0] loop_continue;
integer i;
reg broken;
Test0 = 0;
broken = 0;
begin
for (i=1; i<20; i=i+1) begin
if (!broken) begin
Test0 = Test0 + 1;
if (i[3:0] != loop_continue) begin // continue
if (i[3:0] == loop_break) begin
broken = 1'b1;
end
if (!broken) begin
Test0 = Test0 + i[15:0];
end
end
end
end
end
endfunction
function [15:0] Test1;
input [3:0] loop_stop;
input [3:0] loop_break;
input [3:0] loop_continue;
integer i;
Test1 = 0;
begin : outer_block
for (i=1; i<20; i=i+1) begin : inner_block
Test1 = Test1 + 1;
// continue, IE jump to end-of-inner_block. Must be inside inner_block.
if (i[3:0] == loop_continue) disable inner_block;
// break, IE jump to end-of-outer_block. Must be inside outer_block.
if (i[3:0] == loop_break) disable outer_block;
Test1 = Test1 + i[15:0];
end : inner_block
end : outer_block
endfunction
function [15:0] Test2;
input [3:0] loop_stop;
input [3:0] loop_break;
input [3:0] loop_continue;
integer i;
Test2 = 0;
begin
for (i=1; i<20; i=i+1) begin
Test2 = Test2 + 1;
if (i[3:0] == loop_continue) continue;
if (i[3:0] == loop_break) break;
Test2 = Test2 + i[15:0];
end
end
endfunction
function [15:0] Test3;
input [3:0] loop_stop;
input [3:0] loop_break;
input [3:0] loop_continue;
integer i;
Test3 = 0;
begin
for (i=1; i<20; i=i+1) begin
Test3 = Test3 + 1;
if (i[3:0] == loop_continue) continue;
// return, IE jump to end-of-function optionally setting return value
if (i[3:0] == loop_break) return Test3;
Test3 = Test3 + i[15:0];
end
end
endfunction
endmodule
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