1. 2-to-1 Multiplexer: if Statement Discussion D2.1 Example 4

2. 2-to-1 Multiplexer Multiplexers The VHDL if statement

3. Multiplexers A multiplexer is a digital switch: If s = 0, y = a; if s = 1, y = b

4. Multiplexers A multiplexer is a digital switch: If s = 0, y = a; if s = 1, y = b

5. - Example 4a: 2-to-1 MUX using logic equations library IEEE; use IEEE.STD_LOGIC_1164.all; entity mux21a is port( a : in STD_LOGIC; b : in STD_LOGIC; s : in STD_LOGIC; y : out STD_LOGIC ); end mux21a; architecture mux21a of mux21a is begin y <= (not s and a) or (s and b); end mux21a;

6. Aldec Active-HDL Simulation

7. 2-to-1 Multiplexer Multiplexers The VHDL if statement

8. Multiplexers A multiplexer is a digital switch: If s = 0, y = a; if s = 1, y = b if s = '0' then y <= a; else y <= b; end if; VHDL

9. - Example 4b: 2-to-1 MUX using if statement library IEEE; use IEEE.STD_LOGIC_1164.all; entity mux21b is port( a : in STD_LOGIC; b : in STD_LOGIC; s : in STD_LOGIC; y : out STD_LOGIC ); end mux21b; architecture mux21b of mux21b is begin mux2b_1: process(a, b, s) begin if s = '0' then y <= a; else y <= b; end if; end process mux2b_1; end mux21b;