EDA技术及应用教程 (赵全利,秦春斌) 课后习题答案 机械工业出版社
部分习题参考答案3.6习题3
3.合法标识符：my_counter、Decoder_1、data__BUS、Sig_N
非法标识符：2FFT、Sig_#N、Not-Ack、ALL_RST_、return、entity 7.参考程序为：
entityNOR2aisPort( A,B: instd_logic; C : out std_logic ); endNOR2a;
15. Q=”00100100”
4.4习题4 1.用PROCESS语句和CASE-WHEN语句，参考程如下：
library ieee;
use ieee.std_logic_1164.all; entity decoder3_8 is
port(a,b,c,g1,g2a,g2b: in std_logic;
y: out std_logic_vector(7 downto 0)); end decoder3_8;
architecture a of decoder3_8 is
signal dz:std_logic_vector(2 downto 0); begin
dz<=c&b&a;
process (dz,g1,g2a,g2b) begin
if(g1='1'and g2a='0'and g2b='0')then case dz is
when "000"=> y<="11111110"; when "001"=> y<="11111101"; when "010"=> y<="11111011"; when "011"=> y<="11110111"; when "100"=> y<="11101111"; when "101"=> y<="11011111"; when "110"=> y<="10111111"; when "111"=> y<="01111111"; when others=>y<="XXXXXXXX"; end case; else
y<="11111111"; end if; end process;
end
用WHEN-ELSE语句，参考程序如下：
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