创造价值的IT人

摘要： --第一个底层设计实体 74HC161library ieee;use ieee.std_logic_1164.all;use ieee.std_logic_arith.all;entity v74x161 isport( clk,clr_l,ld_l,enp,ent:in std_logic; d:in unsigned(3 downto 0); q:out unsigned(3 downto 0); rco:buffer std_logic);end v74x161;architecture v74x161_arch of v74x161 issignal iq:unsigned(3 d. 阅读全文