1. Introduction

   
   A n to 2ⁿ decoder is a combinatorial logic device which has n input lines and 2ⁿ output lines. For each possible combination of n input binary lines, one and only one output signal will be logic 1. Thus, the decoder is a min-term generator in which each output corresponds to one min-term. Decoders are important logic blocks that find a wide variety of applications in the design of digital systems.
   

   Input: (log₂n)
   Output: n bits (exactly one output pins is 1, rest of the pins are 0)

   Example:3-8 decoder
   

   Input:3 bits representing a binary input number
   Output:1 bit corresponding to the value of the binary input number is set to 1

   Figure 1 shows the block diagram of the 3-to-8 decoder.
   

   Figure 1. Block diagram of a 3-to-8 decoder

   
   

2. Truth Table

   
   Figure 2 shows the truth table of a 3-to-8 decoder. Ip0 to Ip2 are the binary input lines and the Op0 to Op7 are the eight output lines.
   

   Figure 2. Truth table of 3-to-8 decoder.

   
   

3. Verilog Module

   
   Figure 3 presents the Verilog module of the 3-to-8 decoder. The module takes three 1-bit binary values from the three input ports Ip0 to Ip2. The eight 1-bit binary value outputs are presented in eight output ports Op0 to Op7. The decoder function is controlled by using an enable signal, EN.
   

   Figure 3. Verilog module of 3-to-8 decoder.

   
   

4. Verilog Code for 3-to-8 Decoder (decoder3to8.v)

   
   

   Figure 4. Verilog Code for 3-to-8 decoder

   
   

5. Verilog Test Bench for 3-to-8 Decoder (decoder3to8_tb.v)

   
   

   Figure 5. Verilog Test-bench for 3-to-8 decoder

   
   

6. Timing Diagram

   
   

   Figure 6. Timing diagram of 3-to-8 decoder

   
   

1. 4 To 8 Decoder
2. Vhdl Code For 3 To 8 Decoder Using Case Statement
3. 3 To 8 Decoder Vhdl
4. 3 To 8 Decoder Vhdl Code

3 to 8 Binary Decoder VHDL Design In this tutorial, we will design and implement a 3-to-8 decoder using two 2-to-4 decoders in Xilinx ISE CAD tool. The implementation will be on Basys 2 FPGA board using VHDL programming language. VHDL Code for 3x8 Decoder A Decoder is a combinational logic circuit which converts code into a set of signals. It is exactly opposite of Encoder. It is mostly used to generate selection or enable line in a digital circuit. VHDL CODE FOR 3 TO 8 DECODER: library ieee; use ieee.stdlogic1164.all; entity a3to8decoder is port view the full answer. Using two 3-8 decoder chips: You would need to connect first 3 data lines in parellel to the two decoder ICs, then use the remaining high bit as an enable to the. Design a 3-to-8 line decoder. Let the input be through SW2-SW0 and output be on LED7-LED0. Use dataflow modeling constructs. Open Vivado and create a blank project called lab311. Create and add the VHDL module, naming it decoder3to8dataflow.vhd that defines the 3-to-8 line decoder with three-bit input x and 8-bit output y.

Entity decoder is port ( x : in std_logic_vector (2 down too)

Y : out std_logic_vector ( 0 down to 7 )

en : in std_logic) ;

End decoders;

Architecture behavioral of decoder is signal Y 1 : std_logic_vector (7 down to 0) ;

BeginY1 < = “0111 111” when z = “ 000 “ else

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“10111111” when x = “001” else

“11011111” when x = “010” else

4 To 8 Decoder

“11101111” when x = 011” else

“11110111” when x = “100” else

“11111011” when x = “101” else

Vhdl Code For 3 To 8 Decoder Using Case Statement

“11111101” when x = “110” else

“11111110” when x = “111” else

3 To 8 Decoder Vhdl

“11111111” when others;

Y < = y, when en = ‘0’ else “1111 1111” ;

3 To 8 Decoder Vhdl Code

End behavioral.