LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
USE IEEE.STD_LOGIC_ARITH.ALL;
USE IEEE.STD_LOGIC_UNSIGNED.ALL;
ENTITY mux4x1_if_else IS
PORT (
a, b, c, d : IN STD_LOGIC;
s : IN STD_LOGIC_VECTOR (1 DOWNTO 0);
y : OUT STD_LOGIC);
END mux4x1_if_else;
ARCHITECTURE Behavioral_if_else OF mux4x1_if_else IS
BEGIN
PROCESS (s, a, b, c, d)
BEGIN
IF (s = "00") THEN
y <= a;
ELSIF (s = "01") THEN
y <= b;
ELSIF (s = "10") THEN
y <= c;
ELSE y <= d;
END IF;
END PROCESS;
END Behavioral_if_else;
4:1 Mux Behavioural Modelling using If-Else Statements
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