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author | bryan newbold <bnewbold@leaflabs.com> | 2013-10-08 23:33:18 -0400 |
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committer | bryan newbold <bnewbold@leaflabs.com> | 2013-10-08 23:48:05 -0400 |
commit | 3b13cb7d690ba1891f008d2905fcfb36049c71ff (patch) | |
tree | 12ddf94a955c2f8611c43c269d4620629fa3d31c /tb/rot13_tb.v | |
parent | b31c07157b7b8ca7e8823749e140fcab24b787d2 (diff) | |
download | basic-hdl-template-3b13cb7d690ba1891f008d2905fcfb36049c71ff.tar.gz basic-hdl-template-3b13cb7d690ba1891f008d2905fcfb36049c71ff.zip |
clean up test stuff
Diffstat (limited to 'tb/rot13_tb.v')
-rwxr-xr-x | tb/rot13_tb.v | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/tb/rot13_tb.v b/tb/rot13_tb.v new file mode 100755 index 0000000..1ec21c4 --- /dev/null +++ b/tb/rot13_tb.v @@ -0,0 +1,77 @@ +`timescale 1ns/1ps +module rot13_tb; + +reg synth_clk_12mhz; +always @(synth_clk_12mhz) begin + #41.6665 synth_clk_12mhz <= ~synth_clk_12mhz; +end + +initial begin + // the first event that sets the clock in motion + #0 synth_clk_12mhz <= 1'b0; +end + +reg reset; +integer nfail; + +reg [7:0] in_char; +wire [7:0] out_char; + +rot13 rot13_inst ( + .clock(synth_clk_12mhz), + .reset(reset), + .in_char(in_char), + .out_char(out_char) +); + +task check_rot13; + input [7:0] a; + input [7:0] b; + begin + in_char <= a; + #100 // 100 ns delay + if (out_char !== b) begin + nfail = nfail + 1; + $display("FAIL: '%c' -> '%c' (got '%c')", a, b, out_char); + end else begin + $display("'%c' -> '%c'", a, out_char); + end + end +endtask + +initial begin + nfail = 0; + $display("=================== start %m"); + #0 + reset <= 1'b1; + #1000 + reset <= 1'b0; + #100 + + check_rot13("A", "N"); + check_rot13("a", "n"); + check_rot13("N", "A"); + check_rot13("n", "a"); + check_rot13("M", "Z"); + check_rot13("m", "z"); + check_rot13("Z", "M"); + check_rot13("z", "m"); + check_rot13(".", "."); + check_rot13("8", "8"); + check_rot13("@", "@"); + check_rot13("[", "["); + check_rot13("`", "`"); + check_rot13("{", "{"); + + // uncomment the below to ensure failures are caught + //check_rot13("a", "a"); + + if (nfail !== 0) begin + $display("=================== %m: FAIL (%d problems)", nfail); + end else begin + $display("=================== %m: PASS"); + end + $finish(); +end + +endmodule |