拨码开关控制LED灯

拨码开关控制LED灯

/*--------------------------------------------------------
-- Engineer: zhrscut
-- Create Date:
-- Module Name:
-- Tool Versions: Quartus_II 9.1
-- 欢迎加入 EEPW ，FPGA 开发板 DIY 活动
--------------------------------------------------------*/
module switch_key(clk,led,key);

input clk;
input[1:0] key;
output[7:0] led;


reg[7:0] led_r;

always @(posedge clk)
begin
if(key==0)
led_r<=8'b0000_1111;
else if(key==1)
led_r<=8'b0101_0101;
else if(key==2)
led_r<=8'b1010_1010;
else
led_r<=8'b1111_0000;

end


assign led=led_r;

endmodule