EEPW论坛

源代码：

waite_posedge:
begin
ir_cnt<=ir_cnt+1'b1;
if(ir_posedge)
ir_state<=check_9ms;
else
ir_state<=waite_posedge;
end
check_9ms:
begin
if(t_9ms)
begin
ir_state<=waite_negedge;
ir_cnt<=9'd0;
end
else
ir_state<=idle;
end

这段代码是计数9ms后，判断上升沿，还是判断上升沿，在进行计数9ms，时序上应该是高电平是9ms，没有理解这个代码，有高手解释一下