wait for 语句在综合的时候通不过啊，求指导啊！！！
代码：
main : process
begin
reset_n<='0';
RxD<='1';
wait for 200ns;
reset_n<='1';
wait for 250ns;
RxD<='0';
wait for 100ns;
RxD<='1';
wait for 100ns;
RxD<='0';
wait for 200ns;
reset_n<='0';
RxD<='1';
wait for 100ns;
reset_n<='1';
wait;
end process;
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