esTc 设计中 方法一:布尔表达式 IBRARY EEE. USE EEE STD LOG1C 1164.ALLI ENTITY and3 Is PORT(a, b, C: IN STD_ LOGIC; y: OUT STD LOGIC); END and3 ARCHITECTURE and3 oF and3 s BEGIN y <=(a AND b AND C); END and3 1.设计中心 方法一：布尔表达式 LIBRARY IEEE; USE IEEE.STD_LOG1C_1164.ALL; ENTITY and3 IS PORT (a, b, c : IN STD_LOGIC; y : OUT STD_LOGIC); END and3; ARCHITECTURE and3_1 OF and3 IS BEGIN y <= (a AND b AND c) ; END and3_1;