请教个问题 关于Warning: Output pins are stuck at VCC or GND
总出现警告：Warning: Output pins are stuck at VCC or GNDWarning (13410): Pin "L" is stuck at GND
程序如下
//test button and led
module button(E,L,clk);//capital
output L;
input E,clk;
reg sig=1'd0,count=11'd0,LED=1'd0;
always@ (negedge E)
sig <= 1'd1;
always@ (posedge clk) begin
if (sig == 1'd1)
if (count == 11'd1999) begin
sig <= 1'd0;
count <= 11'd0;
LED <= 1'd1;
end
else count <= count + 1'd1;
end
assign L = LED;
endmodule
显示警告：Warning: Output pins are stuck at VCC or GND
Warning (13410): Pin "L" is stuck at GND
Warning: Design contains 2 input pin(s) that do not drive logic
Warning (15610): No output dependent on input pin "E"
Warning (15610): No output dependent on input pin "clk"
Warning: Following 1 pins have nothing, GND, or VCC driving datain port -- changes to this connectivity may change fitting results
Info: Pin L has GND driving its datain port 额，显示有人回复，怎么看不到呢
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