用计数器对输入金额进行计数,大于等于1.5元时出货并找零。
注意在出货的同时也可能投币,并且不支持同时投入三种货币
`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] d_cnt ;
wire d_cur ;
assign d_cur = d1 ? d1 : (d2 ? d2 : (d3 ? d3 : 0));
always @(posedge clk or negedge rst) begin
if(!rst)
d_cnt <= 'd0 ;
else if(d_cnt+d_cur>=3)
d_cnt <= d_cur ;
else if(d1)
d_cnt <= d_cnt + 1 ;
else if(d2)
d_cnt <= d_cnt + 2 ;
else if(d3)
d_cnt <= d_cnt + 4 ;
else
d_cnt <= d_cnt ;
end
always @(posedge clk or negedge rst) begin
if(!rst) begin
out1 <= 'd0 ;
out2 <= 'd0 ;
end
else if(d_cnt+d_cur>=3) begin
out1 <= 1'b1 ;
out2 <= d_cnt + d_cur - 3 ;
end
else begin
out1 <= 1'b0 ;
out2 <= 'd0 ;
end
end
//*************code***********//
endmodule
标签:cnt,wire,进阶,牛客,贩售,input,d2,d3,d1
From: https://www.cnblogs.com/icwangpu/p/17035259.html