声音信号到来判断程序“跑死”

reg a;
reg b;
reg c;
reg d;   
///////abcd信号到来指示,为1表示信号到达
always @(posedge clka or negedge reset)
begin
if(！reset)
begin
a<=1'b0;
end
else
begin a<=1'b1;end
end
always @(posedge clkb or negedge reset)
begin
if(！reset)
begin
b<=1'b0;
end
else
begin b<=1'b1;end
end
always @(posedge clkc or negedge reset)
begin
if(！reset)
begin
c<=1'b0;
end
else
begin c<=1'b1;end
end
always @(posedge clkd or negedge reset)
begin
if(！reset)
begin
d<=1'b0;
end
else
begin d<=1'b1;end
end
//判断四路信号输入，加复位后出现以下问题
Info: Registers with preset signals will power-up high
Info: DEV_CLRn pin will set, and not reset, register with preset signal due to NOT Gate Push-Back
Warning: Output pins are stuck at VCC or GND
Warning (13410): Pin "LCD_RW" is stuck at GND
程序跑到上面提示后跑不下去了，但是把复位去掉只有
always @(posedge clkd or negedge reset)
begin
d<=1'b1;
end时却可以跑，请问有何问题?

negedge reset，也就是采用低复位，后面代码也是低复位。
把reset的产生逻辑发出来一下。