题解 | 求两个数的差值
`timescale 1ns/1ns
module data_minus(
input clk,
input rst_n,
input [7:0]a,
input [7:0]b,
output reg [8:0]c
);
always@(posedge clk or negedge rst_n)begin
if(rst_n == 0)begin
c <= 9'd0;
end
else begin
if( a > b)
//c <= {a[7],a} - {b[7],b};
c <= a - b;
else
//c <= {b[7],b} - {a[7],a};
c <= b - a;
end
end
endmodule