请高手指教

sghxz

向高手请教
input clock,reset,overheat_in,pushbutton_in;
output overheat_out;
reg overheat_out;
reg pushbutton_sync1,pushbutton_sync2;
reg overheat_in_sync1,overheat_sync2;
always @(posedge clock or posedge reset)
begin
if(reset)
     begin
    pushbutton_sync1<=1'b0;
    pushbutton_sync2<=1'b0;
    overheat_in_sync1<=1'b0;
    overheat_in_sync2<=1'b0;
    end
else begin
    pushbutton_sync1<=pushbutton_in;
    pushbutton_sync2<=pushbutton_sync1;
    overheat_in_sync1<=overheat_in;  
    overheat_in_sync2<=overheat_sync1;
     end
end
always @(posedge clock or posedge reset)
begin
    if(reset)
        overheat_out<=1'b0;
else if(overheat_in_sync2 && pushbutton_sysnc2)  
        overheat_out<=1'b1;
end
endmodule
这里面第一个always有什么作用,没有它也是正确的啊

sghxz

大家快来看看哪