题解 | #自动贩售机1#

我的代码就15行，没有用状态机，是不是不规范呀。

`timescale 1ns/1ns

module seller1(

input wire clk  ,
input wire rst  ,
input wire d1 ,
input wire d2 ,
input wire d3 ,

output reg out1,
output reg [1:0]out2

); //**code//

reg [2:0] MoneySum;
always @(posedge clk or negedge rst) begin
    if(!rst) begin
        MoneySum <= 3'd0;
        out1 <= 1'b0;
        out2 <= 2'd0; end
    else if(MoneySum < 3'b011) begin
        MoneySum <= MoneySum + {d3,d2,d1};
        out1 <= 1'b0;
        out2 <= 2'b00; end
    else begin
        MoneySum <= 3'b000;
        out1 <= 1'b1;
        out2 <= MoneySum - 3'b011; end
end

//**code// endmodule