题解 | #游戏机计费程序#

这样居然也能过

`timescale 1ns/1ns

module game_count
    (
		input rst_n, //异位复位信号，低电平有效
        input clk, 	//时钟信号
        input [9:0]money,
        input set,
		input boost,
		output reg[9:0]remain,
		output reg yellow,
		output reg red
    );
    
    always@(posedge clk or negedge rst_n)begin 
        if(!rst_n)begin
            remain <= 0;
        end
        else if(set)begin
            remain <= remain + money;
        end
        else if(boost)begin
            remain <= remain - 2;
        end
        else 
            remain <= remain - 1;
    end
    always@(posedge clk or negedge rst_n)begin
        if(!rst_n)begin
            yellow <= 0;
            red <= 0;
        end
        else if(remain < 10 && remain > 0)begin
            yellow <= 1;
            red <= 0;
        end
        else if(remain == 0)begin
            yellow <= 0;
            red <= 1; 
        end
        else begin 
            yellow <= 0;
            red <= 0;
        end
    end
    
endmodule