各位大侠!帮我看看锁存器程序. 锁存器, 大侠, 程序

boyfly

是不是q<="ZZZZZZZZ"呀 Z作为高阻态时，必须大写！

hxxfff

双引号

limpet

373程序吧

kzw

呵呵，初学者容易犯的错误，我曾经也犯过。

kenail

if oe='0'then q<=qint; --when (oe='0') else q<='zzzzzzzz'; 改成 if oe='0'then q<=qint; --when (oe='0') else q<="ZZZZZZZZ"; end if; 就可以了

bocolia

if 语句必须写在进程之中。

zhf2477

各位大侠!帮我看看锁存器程序. library ieee; use ieee.std_logic_1164.all; use ieee.std_logic_arith.all; use ieee.std_logic_unsigned.all; entity latch is port (d:in std_logic_vector(7 downto 0); qut std_logic_vector(7 downto 0); clk,oe: in std_logic ); end latch; architecture a of latch is signal qint: std_logic_vector(7 downto 0); begin process(clk,d) begin if clk'event and clk='1'then qint<=d; end if; end process; if oe='0'then q<=qint; --when (oe='0') else q<='zzzzzzzz'; end a; 提示:error:line21: vhdl syntax error: character literal "z" must be terminated with an apostrophe 谢谢!

bocolia

要不，这样写也可以： q <= qint when oe = '0' else (others =>'Z');