小弟写了个反相器，程序：
library ieee;
use ieee.std_logic_1164.all;
entity notbuffer is
port(a : in std_logic;b out std_logic);
end notbuffer;
architecture notbuffer of notbuffer is
begin
if（a'event） then
b<=NOT a AFTER 5 ns;
end if;
end notbuffer;
编译时一直提示if附近有语法错误 请各位大侠帮忙看看，小弟感激不尽！ |
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楼主
