程序改错题1.已知 sel 为 STD_LOGIC_VECTOR(1 DOWNTO 0)类型的信号,而 a、b、c、d、q 均为STD_LOGIC 类型的信号,请判断下面给出的 CASE 语句程序片段: CASE sel IS WHEN“00”=qqqqQQ Q Q q q q q LED7S LED7S LED7S LED7S LED7S LED7S LED7S LED7S LED7S LED7S LED7S yyyyyyyy null;end case;end process;end one;4、LIBRARY IEEE;USE IEEE.STD_LOGIC_1164.ALL;ENTITY counter ISPORT ( reset: IN STD_LOGIC;clock: IN STD_LOGIC;num: buffer integer range 0 to 3; 多一个“;” ); END;ARCHITECTURE behav OF jishu IS jishu 改为 counter BeginProcess(reset,clock)BeginIf reset=1 thennumB THEN GT null;附:自动化 123 江西理工大学 王显聪