题解 | #自动贩售机2#
自动贩售机2
https://www.nowcoder.com/practice/298dec1c3dce45c881f3e53e02558828
`timescale 1ns/1ns
module seller2(
input wire clk ,
input wire rst ,
input wire d1 ,
input wire d2 ,
input wire sel ,
output reg out1,
output reg out2,
output reg out3
);
//*************code***********//
reg [2:0] money;
always@(posedge clk or negedge rst) begin
if(!rst) money <= 0;
else if(sel) money <= (money>=3'd5)? 0 : money + {d2,d1};
else money <= (money>=3'd3)? 0 : money + {d2,d1};
end
always@(posedge clk or negedge rst) begin
if(!rst) begin
out1 <= 0;
out2 <= 0;
out3 <= 0;
end
else case({sel,money})
4'b0011: begin
out1 <= 1;
out3 <= 0;
end
4'b0100: begin
out1 <= 1;
out3 <= 1;
end
4'b1101: begin
out2 <= 1;
out3 <= 0;
end
4'b1110: begin
out2 <= 1;
out3 <= 1;
end
default: begin
out1 <= 0;
out2 <= 0;
out3 <= 0;
end
endcase
end
//*************code***********//
endmodule
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