Given five 1-bit signals (a, b, c, d, and e), compute all 25 pairwise one-bit comparisons in the 25-bit output vector. The output should be 1 if the two bits being compared are equal.
out[24] = ~a ^ a; // a == a, so out[24] is always 1.
out[23] = ~a ^ b;
out[22] = ~a ^ c;
...
out[ 1] = ~e ^ d;
out[ 0] = ~e ^ e;
module top_module (
input a, b, c, d, e,
output [24:0] out );//
assign out=~{{5{a}},{5{b}},{5{c}},{5{d}},{5{e}}}^{5{a,b,c,d,e}};
// The output is XNOR of two vectors created by
// concatenating and replicating the five inputs.
// assign out = ~{ ... } ^ { ... };
endmodule