让led闪烁
module led(sys_clk,
sys_rstn,
led
);
input sys_clk;
input sys_rstn;
output [2:0] led;
reg [2:0] led;
reg [24:0] delay_cnt;
always@(posedge sys_clk or negedge sys_rstn)
begin
if(!sys_rstn)
delay_cnt <= 25'd0;
else
begin
if(delay_cnt == 25'd24999999)
delay_cnt <= 25'd0;
else
delay_cnt<=delay_cnt+1'b1;
end
end
always@(posedge sys_clk or negedge sys_rstn)
begin
if(!sys_rstn)
led<=3'b111;
else
begin
if(delay_cnt==25'd24999999)
led<=~led;
else
led<=led;
end
end
endmodule
此帖出自
小平头技术问答
一周热门 更多>