8 To 1 Multiplexer Vhdl

  1. The input becomes output and vice versa. Here in the given figure, one case is highlighted when D7 input is ‘1’ all outputs a = 1, b=1, and c=1. You can verify other combinations from the truth table. In the next tutorial, we shall design 8×1 multiplexer and 1×8 de-multiplexer circuits using VHDL.
  2. Verilog code for 8:1 Multiplexer (MUX) – All modeling styles A multiplexer is a data selector which selects a particular input data line and produce that in the output section. It is implemented using combinational circuits and is very commonly used in digital systems.
  3. I'm writing a VHDL code to model an 8x1 multiplexer where each input has 32-bit width. So I created an array to model the MUX but now I'm stuck with the Test Bench, it's gotten so complicated.
an adder/subtractor circuit ,as the name indicates ,is able to perform addition as well as subtraction.Here ,I used 4 bit addition and subtraction units together.(Such a circuit is available in the market. It is 7483).Here ,I have a control signal as input ,in addition to the conventional inputs.Here,when the control signal is '0' addition takes place.When control signal is '1',subtraction takes place.The control signal is represented as ADD_SB.Now consider the logic diagram shown below.If you are not familiar with the design of this circuit,please refer any standard text book of Digital Electronics.

Write a VHDL code for 8:1 Multiplexer with active low enable input. Follow via messages; Follow via email. Port (sel: in stdlogicvector(2. VHDL Code For 8:1 multiplexer Multiplexer is simply a data selector.It has multiple inputs and one output.Any one of the input line is transferred to output depending on the control signal.


Now consider the VHDL code
--FIRST START WITH A FULL ADDER
--THEN DESIGN XOR GATE
--THEN BIND 4 FULL ADDERS AND 4 XOR GATES
--PURE STRUCTURAL MODELING
--MIXED OR BEHAVIORAL ALSO CAN BE USED
--PREPARED BY BIJOY
LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
ENTITY FA IS
PORT(A,B,CIN:IN STD_LOGIC;SUM,COUT:OUT STD_LOGIC);
END FA;
ARCHITECTURE BEHV OF FA IS
BEGIN
SUM<=A XOR B XOR CIN;
COUT<=(A AND B) OR (B AND CIN) OR (A AND CIN);
END BEHV;
--I AM GOING TO DESIGN AN ENTITY FOR XOR FUNCTION
LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
ENTITY XOR_1 IS
PORT(A,B:IN STD_LOGIC;Y:OUT STD_LOGIC);

8 To 1 Multiplexer Vhdl


END XOR_1;
ARCHITECTURE BEHV OF XOR_1 IS
BEGIN
Y<=A XOR B;
END BEHV;
LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
ENTITY ADD_SUB IS
PORT(A,B:IN STD_LOGIC_VECTOR(3 DOWNTO 0);AD_SB:IN STD_LOGIC;SUM_DIF:OUT STD_LOGIC_VECTOR(3 DOWNTO 0);COUT :OUT STD_LOGIC);
END ADD_SUB;
ARCHITECTURE BEH123 OF ADD_SUB IS
SIGNAL TEMP:STD_LOGIC_VECTOR(3 DOWNTO 0);
SIGNAL C_TEMP:STD_LOGIC_VECTOR(2 DOWNTO 0);

Vhdl Code For 8 To 1 Multiplexer Using Structural Modelling

BEGIN
XOR1:ENTITY WORK.XOR_1 PORT MAP(B(0),AD_SB,TEMP(0));
XOR2:ENTITY WORK.XOR_1 PORT MAP(B(1),AD_SB,TEMP(1));
XOR3:ENTITY WORK.XOR_1 PORT MAP (B(2),AD_SB,TEMP(2));
XOR4:ENTITY WORK.XOR_1 PORT MAP (B(3),AD_SB,TEMP(3));Vhdl
-- INV1:ENTITY WORK.INV PORT MAP (AD_SB,CTRL);
--ADDER:ENTITY WORK.ADDER_4BIT PORT MAP(A,TEMP,SUM,COUT);
FA1:ENTITY WORK.FA PORT MAP (A(0),TEMP(0),AD_SB,SUM_DIF(0),C_TEMP(0));
FA2:ENTITY WORK.FA PORT MAP (A(1),TEMP(1),C_TEMP(0),SUM_DIF(1),C_TEMP(1));
FA3:ENTITY WORK.FA PORT MAP (A(2),TEMP(2),C_TEMP(1),SUM_DIF(2),C_TEMP(2));

Vhdl Code For 8 To 1 Multiplexer

FA4:ENTITY WORK.FA PORT MAP (A(3),TEMP(3),C_TEMP(2),SUM_DIF(3),COUT);
END BEH123;
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