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在下面横线上填上合适的语句,完成 8 位双向总线缓冲器的设计。 LIBRARY IEEE; USE IEEE.STD_LOGIC_1164.ALL; ENTITY TRI_BIGATE IS PORT( A,B: INOUT STD_LOGIC_VECTOR(7 DOWNTO 0); EN, DR: IN STD_LOGIC); END; ARCHITECTURE RTL OF TRI_BIGATE IS SIGNAL AOUT, BOUT:STD_LOGIC_VECTOR(7 DOWNTO 0); BEGIN PROCESS(A, DR, EN) BEGIN IF (EN=‘0’) AND (DR=‘1’) THEN BOUT<=A; ELSE BOUT<=“ZZZZZZZZ”; END IF; B<=BOUT; END PROCESS; PROCESS(B, DR, EN) BEGIN IF (EN=‘0’) AND (DR=‘0’) THEN AOUT<= ( ) ; ELSE AOUT<= ( ) ; END IF; A<= ( ) ; END PROCESS; END;
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【简答题】阅读下面短文。根据短文内容从每题所给的四个选项中选择最佳选项。 For years, children in the industrial areas of Europe and America seldom left their smoky cities to see the beauties of the countryside. This was not because the woods ...
【简答题】Chinese government still has a lot to say about the business such as whether goods can be imported at all, the terms under which it enters, who can bring it in, and who can distribute, sell and servic...
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