No.64138 作者:mateng 邮件:mateng123@eyou.com ID:26565 登陆:2次 文章数:2篇 最后登陆IP:202.113.176.189 最后登陆:2004/10/12 11:45:34 注册:2004/10/11 11:09:41 财富:108 发帖时间:2004/10/11 11:13:14 发贴者IP:202.113.176.189 标题:mateng:请教vhdl问题 摘要:No.64138请教vhdl问题 library IEEE; use IEEE.std_logic_1164.all; entity dou is port ( din: in STD_LOGIC; clk: in STD_LOGIC; dout: out STD_LOGIC ); end dou; architecture dou_arch of dou is signal x,y:std_logic; begin process(clk) begin if clk'event and clk='1' then x <=din; y <=x; end if; dout <=x and (not y); end process; end dou_arch; 请问 x <=din; y <=x; 是并行执行还是顺序执行? ......
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