Design of 2 to 4 Decoder using CASE Statements (Behavior Modeling Style)-
Decoder Verilog Code And Testbench
Output Waveform : 2 to 4 Decoder |
VHDL Code -
-------------------------------------------------------------------------------
--
-- Title : decoder_case
-- Design : vhdl_upload 1
-- Author : Naresh Singh Dobal
-- Company : [email protected]
-- VHDL Tutorials & exercise by Naresh Singh Dobal
-------------------------------------------------------------------------------
--
-- File : 2 to 4 decoder using case.vhd
library IEEE;
use IEEE.STD_LOGIC_1164.all;
entity decoder_case is
port(
din : in STD_LOGIC_VECTOR(1 downto 0);
dout : out STD_LOGIC_VECTOR(3 downto 0)
);
end decoder_case;
architecture decoder_case_arc of decoder_case is
begin
decoder : process (din) is
begin
case din is
when '00' => dout <= '1000';
when '01' => dout <= '0100';
when '10' => dout <= '0010';
when others => dout <= '0001';
end case;
end process decoder;
end decoder_case_arc;
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Decoder 4 To 16 Vhdl Code For Serial Adder -> DOWNLOAD
a1e5b628f3 This page of VHDL source code covers 3 to 8 decoder vhdl code. RF . 2bit Parallel to serial. . to Binary Binary to Gray Full Adder 3 to 8 Decoder 8 to 3 .The 4-bit Ripple Carry Adder VHDL Code can be Easily Constructed by Port Mapping 4 Full Adder. . VHDL Code for 2 to 4 decoder; VHDL Code for 4 to 2 Encoder; About Us.Generic 2's complement Adder/Subtractor Unit . 4-to-16 Decoder (XDC included): . (VHDL main file) Generic Serial Multiplier (NxN, unsigned .I've a design problem in VHDL with a serial adder. . Serial Adder vhdl design. . 301 2 16. I should probably .Verilog HDL program for 4-BIT Parallel Adder; . 2 Responses to Verilog HDL Program for 3-8 DECODER USING 2-4 DECODER .
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Recent Posts
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Decoder 4 To 16 Vhdl Code For Serial Adder -> DOWNLOAD
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a1e5b628f3 This page of VHDL source code covers 3 to 8 decoder vhdl code. RF . 2bit Parallel to serial. . to Binary Binary to Gray Full Adder 3 to 8 Decoder 8 to 3 .The 4-bit Ripple Carry Adder VHDL Code can be Easily Constructed by Port Mapping 4 Full Adder. . VHDL Code for 2 to 4 decoder; VHDL Code for 4 to 2 Encoder; About Us.Generic 2's complement Adder/Subtractor Unit . 4-to-16 Decoder (XDC included): . (VHDL main file) Generic Serial Multiplier (NxN, unsigned .I've a design problem in VHDL with a serial adder. . Serial Adder vhdl design. . 301 2 16. I should probably .Verilog HDL program for 4-BIT Parallel Adder; . 2 Responses to Verilog HDL Program for 3-8 DECODER USING 2-4 DECODER .
I'm busy working on my blog posts. Watch this space!
Design of 2 to 4 Decoder using CASE Statement (Behavior Modeling Style) -
Ouput Waveform : 2 to 4 Deoder |
Verilog CODE -
//-----------------------------------------------------------------------------
//
// Title : decoder2_4
// Design : verilog upload 2
2 To 4 Decoder Verilog Code Structural
// Author : Naresh Singh Dobal
// Company : [email protected]
// Verilog Programs & Exercise by Naresh Singh Dobal.
//
//-----------------------------------------------------------------------------
//
// File : 2 to 4 decoder using case statement.v
module decoder2_4 ( din ,dout );
output [3:0] dout ;
reg [3:0] dout ;
input [1:0] din ;
2 To 4 Decoder Truth Table
wire [1:0] din ;
always @ (din) begin
case (din)
0 : dout = 8;
1 : dout = 4;
2 : dout = 2;
default : dout = 1;
endcase
end
endmodule
Before going into realities about Encoders and Decoders, let us have a concise thought regarding Multiplexing. Regularly we go over applications where it is expected to nourish a few input signals to a solitary load, each at once. This procedure of choosing one of the input signals to be fed to the load is known as Multiplexing. The invert of this operation, i.e. the way toward nourishing a few loads from one common signal source is known as Demultiplexing. Similarly in a digital domain, for simplicity of transmission of information, the information is regularly scrambled or set inside codes and afterward, this secured code is transmitted. At the collector, the coded information is decoded or accumulated from the code and is handled to be shown or given to the load likewise.
This assignment of encrypting the information and unscrambling the information is finished by Encoders and Decoders. So how about we now comprehend what are really Encoders and Decoders.
What is a Decoder?
A decoder is a multiple input, multiple output logic circuit that changes codes i/ps into coded o/ps, where both the inputs and outputs are dissimilar for instance n-to-2n, and binary coded decimal decoders. Decoding is essential in applications like data multiplexing, memory address decoding, and 7 segment display. The best example of decoder circuit would be an AND-gate because when all its inputs are “High.”, the output of this gate is “High” which is called “active High output”. As an alternative to AND gate, the NAND gate is connected the output will be “Low” (0) only when all its inputs are “High”. Such o/p is called “active low output”.
A slightly more difficult decoder would be the n-to-2n type binary decoders. These kinds of decoders are combinational circuits that modify binary information from n-coded inputs to a most of 2n exclusive outputs. In case then-bit coded data has idle bit combinations, the decoder may have less than 2n outputs. 2-to-4, 3-to-8 line decoder or 4-to-16 decoder are other examples.
The parallel binary number is an input to a decoder, used to notice the occurrence of a particular binary number at the input. The output shows existence or nonexistence of precise number at the decoder input.
Designing of 2 to 4 Line Decoder Circuit
Similar to the multiplexer circuit, the decoder is not restricted to a particular address line, and thus can have more than two outputs (with two, three, or four address lines). The decoder circuit can decode a 2, 3, or 4-bit binary number, or can decode up to 4, 8, or 16 time-multiplexed signals.
As a decoder, this circuit takes an n-bit binary number and generates an output on one of the 2n output lines. It is therefore usually described by the number of addressing i/p lines & the number of data o/p lines. Typical decoder ICs might include two 2-4 line circuits, a 3-8 line circuit, or a 4-16 line decoder circuit. One exclusion to the binary character of this circuit is the 4-10 line decoders, which is proposed to alter a Binary Coded Decimal (BCD) input to a 0-9 range output.
If you employ this circuit as a decoder, you may want to insert data latches at the o/ps to keep every signal while the others are being conveyed. But, this doesn’t relate when you are using this circuit as a decoder, then you will want just a single active o/p to equal the input code.
2 to 4 Line Decoder Truth Table
In this type of decoders, decoders have two inputs namely A0, A1, and four outputs denoted by D0, D1, D2, and D3. As you can see in the following truth table – for every input combination, one o/p line is turned on.
In the above example, you can observe that each o/p of the decoder is truly a minterm, resulting from an assured inputs combination, that is:
D0 =A1 A0, ( minterm m0) which corresponds to input 00 D1 =A1 A0, ( minterm m1) which corresponds to input 01 D2 =A1 A0, ( minterm m2) which corresponds to input 10 D3 =A1 A0, ( minterm m3) which corresponds to input 11
The circuit is implemented with AND gates, as shown in the figure. In this circuit, the logic equation for D0 is A1/A0, and so on. Thus, each output of the decoder will be generated to the input combination.
Applications of Decoder
The applications of decoder involve in the making of various electronic projects.
- War- Field -Flying Robot with a Night Vision Flying Camera
- Robotic Vehicle with Metal Detector
- RF-based Home Automation System
- Speed Synchronization of Multiple Motors in Industries
- Automatic Wireless Health Monitoring System in Hospitals for Patients
- Secret Code Enabled Secure Communication using RF Technology
This is all about decoder, and its applications in communication-based projects. We believe that you might have got a better idea of this concept. Furthermore, any doubts regarding this article, please give your precious suggestions by commenting on the comment section below.