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) begin
        c<=0;
    end
    else begin
        c<=(a>b?(a-b):(b-a));
    end
end
endmodule