| // DESCRIPTION: Verilator: Verilog Test module |
| // |
| // This file ONLY is placed into the Public Domain, for any use, |
| // without warranty, 2005 by Wilson Snyder. |
| |
| module t (/*AUTOARG*/ |
| // Inputs |
| clk |
| ); |
| input clk; |
| |
| integer cyc=0; |
| |
| parameter CNT = 5; |
| |
| wire [31:0] w [CNT:0]; |
| |
| generate |
| for (genvar g=0; g<CNT; g++) |
| sub sub (.clk(clk), .i(w[g]), .z(w[g+1])); |
| endgenerate |
| |
| reg [31:0] w0; |
| assign w[0] = w0; |
| |
| // Test loop |
| always @ (posedge clk) begin |
| cyc <= cyc + 1; |
| if (cyc==0) begin |
| // Setup |
| w0 = 32'h1234; |
| end |
| else if (cyc<90) begin |
| end |
| else if (cyc==99) begin |
| `define EXPECTED_SUM 32'h1239 |
| `ifdef TEST_VERBOSE |
| $write("[%0t] cyc==%0d sum=%x\n",$time, cyc, w[CNT]); |
| `endif |
| if (w[CNT] !== `EXPECTED_SUM) $stop; |
| $write("*-* All Finished *-*\n"); |
| $finish; |
| end |
| end |
| |
| endmodule |
| |
| module sub (input clk, input [31:0] i, output [31:0] z); |
| always @(posedge clk) |
| z <= i+1+$c("0"); // $c so doesn't optimize away |
| endmodule |