没有时钟 这个应该会是组合逻辑电路
always @ (×)
led=~led;
是组合逻辑环路
如果要闪闪可以写成这样子
always@(posedge clk or negedge rst_n)
begin
if(rst_n == 1'b0)
data_dly <= 1'b0;
else
data_dly <= data;
end
always@(posedge clk or negedge rst_n)
begin
if(rst_n == 1'b0)
led <= 1'b0;
else if(data != data_dly)
led <= ~led;
end
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