题解 | #4位数值比较器电路#

`timescale 1ns/1ns

module comparator_4(
	input [3:0] A,
	input [3:0] B,
 
 	output wire Y2, //A>B
	output wire Y1, //A=B
    output wire Y0  //A<B
);

assign Y2 = (A[3] & !B[3]) |
			(!(A[3]^B[3]) & (A[2] & !B[2])) |
			(!(A[3]^B[3]) & !(A[2]^B[2]) & (A[1] & !B[1])) |
			(!(A[3]^B[3]) & !(A[2]^B[2]) & !(A[1]^B[1]) & (A[0] & !B[0]));

assign Y1 = (!(A[3]^B[3]) & !(A[2]^B[2]) & !(A[1]^B[1]) & !(A[0]^B[0]));

assign Y0 = (!A[3] & B[3]) |
			(!(A[3]^B[3]) & (!A[2] & B[2])) |
			(!(A[3]^B[3]) & !(A[2]^B[2]) & (!A[1] & B[1])) |
			(!(A[3]^B[3]) & !(A[2]^B[2]) & !(A[1]^B[1]) & (!A[0] & B[0]));


endmodule