簡(jiǎn)析

輸入：money[9:0], set, boost
輸出：remain, yellow, red

工作模式
set==1時(shí)，進(jìn)行投幣，money會(huì)添加到余額remain上。boost==0是普通模式，每個(gè)時(shí)鐘周期消耗1元；boost==0是暢玩模式，每個(gè)時(shí)鐘周期消耗2元。當(dāng)余額不足時(shí)停止計(jì)費(fèi)（余額小于對(duì)應(yīng)模式的要求）。

    always@(posedge clk or negedge rst_n) begin
        if(~rst_n)
            remain <= 0;
        else if(boost)
            remain <= set     ? remain+money:
                      remain<2? remain:
                      remain-2;
        else
            remain <= set     ? remain+money:
                      remain<1? remain:
                      remain-1;
    end
       

指示燈
黃燈yellow在余額小于10元時(shí)亮起，余額歸零時(shí)滅掉；紅燈red在余額不足時(shí)亮起。

    always@(posedge clk or negedge rst_n) begin
        if(~rst_n) begin
            yellow <= 0;
            red    <= 0;
        end
        else begin
            yellow <= remain<10&&remain;
            red    <= boost? remain<2: remain<1;
        end
    end

代碼

`timescale 1ns/1ns

module game_count
(
    input rst_n, //異位復(fù)位信號(hào)，低電平有效
    input clk, 	//時(shí)鐘信號(hào)
    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
            yellow <= 0;
            red    <= 0;
        end
        else begin
            yellow <= remain<10&&remain;
            red    <= boost? remain<2: remain<1;
        end
    end
    
    always@(posedge clk or negedge rst_n) begin
        if(~rst_n) 
            remain <= 0;
        else if(boost)
            remain <= set     ? remain+money:
                      remain<2? remain: 
                      remain-2;
        else
            remain <= set     ? remain+money:
                      remain<1? remain: 
                      remain-1;
    end
endmodule