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]
		 || (A[3] ^~ B[3]) && (A[2] ^ B[2]) & A[2]
		 || (A[3] ^~ B[3]) && (A[2] ^~ B[2]) && (A[1] ^ B[1]) & A[1]
		 || (A[3] ^~ B[3]) && (A[2] ^~ B[2]) && (A[1] ^~ B[1]) && (A[0] ^ B[0]) & A[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]) & B[3]
		 || (A[3] ^~ B[3]) && (A[2] ^ B[2]) & B[2]
		 || (A[3] ^~ B[3]) && (A[2] ^~ B[2]) && (A[1] ^ B[1]) & B[1]
		 || (A[3] ^~ B[3]) && (A[2] ^~ B[2]) && (A[1] ^~ B[1]) && (A[0] ^ B[0]) & B[0];
endmodule