83 lines
1.8 KiB
Coq
83 lines
1.8 KiB
Coq
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module check (input unsigned [103:0] a, b, c);
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wire [103:0] int_AB;
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assign int_AB = a ^ b;
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always @(a, b, int_AB, c) begin
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#1;
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if (int_AB !== c) begin
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$display("ERROR");
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$finish;
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end
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end
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endmodule
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module stimulus (output reg unsigned [103:0] A, B);
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parameter S = 2000;
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int unsigned i;
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initial begin
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A = 0; B= 0;
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// values with 0, 1
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for (i=0; i<S; i=i+1) begin
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#1 A[103:8] = {$random, $random, $random};
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A[7:0] = $random % 256;
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B[103:8] = {$random, $random, $random};
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B[7:0] = $random % 256;
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end
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// values with x, z
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for (i=0; i<S; i=i+1) begin
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#1;
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A[103:8] = {$random, $random, $random};
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A[7:0] = $random % 256;
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B[103:8] = {$random, $random, $random};
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B[7:0] = $random % 256;
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A[103:72] = xz_inject (A[103:72]);
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A[71:40] = xz_inject (A[71:40]);
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B[71:40] = xz_inject (B[71:40]);
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B[39:8] = xz_inject (B[39:8]);
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end
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end
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// injects some x, z values on 32 bits arguments
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function [31:0] xz_inject (input unsigned [31:0] value);
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integer i, temp;
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begin
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temp = {$random};
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for (i=0; i<32; i=i+1)
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begin
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if (temp[i] == 1'b1)
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begin
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temp = $random;
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if (temp <= 0)
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value[i] = 1'bx; // 'x noise
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else
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value[i] = 1'bz; // 'z noise
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end
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end
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xz_inject = value;
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end
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endfunction
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endmodule
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module test;
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wire unsigned [103:0] a, b;
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wire unsigned [103:0] r;
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stimulus stim (.A(a), .B(b));
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xor104 duv (.a_i(a), .b_i(b), .c_o(r) );
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check check (.a(a), .b(b), .c(r) );
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initial begin
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#120000;
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$display("PASSED");
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$finish;
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end
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endmodule
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