【作业要求】
1、请画出1s跑马灯的时序图？
2、请使用Verilog设计一个翻转灯：led隔1s翻转一次，led一开始亮两个灯，1s之后亮另外两个灯（写出详细的代码）？
【我的做法】
`timescale 1ns / 1ps
module water_LED_text(
input sysclk,
input rst_n,
output reg [3:0] led
);
parameter TIME_1s = 26'd50_000_000;
reg [25:0] count;
always@(posedge sysclk)
if(!rst_n)
count <= 0;
else
begin
if(count == TIME_1s - 1)
count <= 0;
else
count <= count + 1;
end
always@(posedge sysclk)
if(!rst_n)
led <= 4'b0011;
else
if(count == TIME_1s - 1)
led <= {led[1:0],led[3:2]};
else
led <= led;
endmodule
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