Questions tagged [decoder]

A decoder is an electronic signal processing circuit, which takes as an input a binary number, and turns on a corresponding pin accordingly. It takes `n` inputs (which can all be either on or off) and outputs `2^n` outputs of which exactly one is on

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How to post various register updates from FPGA to CPU?

I hope this is not too broad a question, I try to be as specific as I can. I am using a Zynq SoC with FPGA and CPU. I am using the FPGA for a lot of DSP, that depends on many register values. In most ...
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Identifying Protocol Using a Logic Analyzer

I used a logic analyzer to read the data line from a small camera battery and would like to understand the authentication my camera is doing to the battery over the one data line. Is there any way to ...
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Need help regarding BCD to 7-segment decoder

I am fairly new to digital logic designing and I need some help in regards to finding a BCD to 7 segment decoder on software. I am using proteus for my counter, and for some reason I am unable to make ...
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7-segment display decoder truth table

I am trying to make a decoder that can display all alphabetical letters on a 7-segment display. My inputs are ABCDE and the outputs are abcdefg Is this the correct truth table for a circuit? If yes, ...
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TVP5150 output 0x80,0x10 and input video signal not locked

This is my first question, I hope everything is ok :) I have been struggling with a problem for a while now. I have a PAL camera (from which I barely have any information) connected to a TVP5150AM1 IC ...
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TinkerCAD 7-Segment Display Not Showing on Simulation

I am only on my 5th week trying out TinkerCAD for our Logic Circuits course. We are tasked to create a 7-Segment Display Using Logic Gates only. I did all the boolean expressions needed for each ...
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Reading angular velocity from multiple rotary encoders

I am working on a project, where I need to get reliable data from 4 incremental rotary encoders. The motors can spin at a maximum of 100 RPM, with 420 pulses per revolution. This makes a single ...
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Wireless real-time control of RGB led strip using PWM and RF

I would like to send three 8-bit PWM values (generated using an ESP32 and the ledc library) wirelessly in real-time. From what I've come across, RF seems like a good option, however I would prefer not ...
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Upsampling encoded bits (convolutional encoder) and downsampling decoded bits (Viterbi decoder)

I am testing the reaslisation of encoder and decoder. Initial parameters: BPSK. I start with BPSK sequence: ...
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Creating a simple address and data bus with Arduino Uno as a master using 3-state buffers and decoders

First of all, sorry if my post is too general. If you know a better place for this post please let me know. Problem I have 5 motors to be controlled independently (but not simultaneously, i.e. one ...
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Latch the values generated by a 4-16 line decoder

I am using a 4 to 16 line decoder to convert a 4 bit number from arduino/seeed/ESP32 to drive circuits like RGB leds which would otherwise use up all my pins. There are some problems with this ...
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Viterbi decoder: trace chunk, merge distance, path memory: what are these?

I am working on a realisation Viterbi decoder in VHDL. I have found 2 examples for case if K=7 (constraint length) rate=1/2 convolutional code. In the simulation, PATHMEM, MERGEDIST and TRACECHUNK ...
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Arduino - Inverting Common-Anode 7 Segment Display with a Transistor

I am currently struggling a lot with a tedious issue - I have to control my 7-segment display with a CD4511 decoder. However, my display is Common Anode, and it is not changable in my case. The best I ...
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2-to-4 demultiplexer/decoder active HIGH IC

I'm looking for an IC that takes a signal and sends it to one of four possible outputs. So I came across a 2-to-4 demultiplexer which does just that. 74139 series to be precise. However, they all ...
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computation bit error as sum(abs)

I am working on a realisation the convolutional encoder/decoder with constraint length K=7. Encoder and decoder were implemented and currently I am testing these functions My test file looks like: <...
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How decode serial data stream

I am trying to decode a data stream. This signal comes out of an STC 8H1K16 micro-controller. It is from the pin labeled TxD is the picture. When I trigger the signal I am trying to understand I get ...
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Memory Mapping Table

I am a begginer in the field of microcomputers and their architecture and recently I got an assignment with the following instructions: With the use of the mapping table find out which adresses in ...
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7-segment display communication

I have attempted to solve this problem making kmaps for the binary counter, mux and decoder however I'm getting stuck on the making them all talk to each other bit, I am using a ATmega32L and a ...
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Why do decoders have a reverse current when the output voltage is high?

So I am designing a pcb using a STM32 microcontroller and I wanted to expand the output pins in order to add a sensor. So I thought of using a 2-to-4 decoder in order to 'add' 2 pins. However, when ...
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What is a post decoder?

I have heard a bit about pre decoders and post decoders recently in circuit design. When I saw the circuits, the pre decoder is same as the normal decoder in every textbook or website. But I haven't ...
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How to minimize microcode complexity in 8-bit home-brew CPU

tldr; I built and later extended Ben Eaters 8-bit breadboard computer. After the initial build I integrated 16-bit program counter and memory address registers, redesigned the instruction set and ...
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3 Bit Counter w/ 7 Segment Display Starts at 111 instead of 000

The goal for this task is to have a 7 segment display output my last name the first two initials of my first name. The output should be FURMANHE with F being the 000 state and 111 being the E state. ...
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Design 3-to-8 decoder with enable using three 2-to-4 decoders and eight AND gates

I want to design a 3 to 8 decoder with enable using three 2 to 4 decoders without enable and eight AND gates. How can I design it? I thought about it, but only 2 to 8 decoder comes out. I don’t know ...
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Simple 7 segment decoder circuit not working

I used a cd-4511 decoder for my seven segment display circuit. It was a simple circuit, just to get familiar with how the 7 segment display and the decoder operate. However, upon sliding the switches, ...
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Bus contention when addressing tristate buffers by decoder output

I'm currently redesigning the signal propagation algorithm of a circuit simulator I'm developing as a hobby project (https://www.antarescircuit.io). In the new design, I'm trying to detect when ...
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Why doesn't this circuit simulation work?

I am trying to build a circuit using only encoders and decoders. This circuit will output the 1’s complement of 3 bit number. (For example: If I give it 010 it will give output 101.) I used a ...
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Industry Standard for Memory Address Decoder Design

I am currently designing the address decoder of a piece of ReRAM that will be sent to TSMC and manufactured. I have studied in class and textbook that there are two common address decoder designs. One ...
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Help identifying encoding scheme for RF device

I have this RF encoder that I am trying to customize with an MCU. The remote control device uses an encoder called HS2260. I believe it is a clone of PT2262 device. I was able to get the waveform but ...
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Clarification of "strobe pin" 4-bit latch/4 to 16 line decoder

I'm wondering if I can get a specific behavior out of this chip. I have read the data sheet and am having some trouble understanding the usage of the Strobe pin. CD4515BM96 Datasheet PDF USE CASE I'm ...
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Is there a IC to decode Johnson code to BCD 8421 or 7-segment? [closed]

I'm studying Johnson counter and want to display the counting on a 7-segment display. Is there an IC to decode Johnson code to BCD 8421 or directly to a 7-segment displays?
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Verilog code for construction of 4x16 decoder using 3x8 decoder [closed]

This is my 3x8 verilog module: ...
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What is the main difference between a decoder and a demultiplexer

What is the difference between a decoder and a demultiplexer and why would you choose one over the other in a design? Apart from the fact that they are constructed and operated differently, they both ...
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Decoder Simulation Results are incorrect

I was trying to design a simple address decoder using VHDL. The simulation results are wrong. I am sharing the code below for your reference. In my design, I want to set a bit in my output ...
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Efficient single cycle huffman decoding technique with wider input data?

I have a wider input data (Byte width) running in my system, and I'm implementing a huffman decoding on this incoming data. Since, the Huffman encoded words don't have the fixed length, hence I need ...
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Difference between IC 74LS47 and 7446N

What are the major differences between these two ICs 74LS47 and 7446N whose working is mostly the same ? Both are used as BCD to 7 segment decoder driver
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Found a particular chip, now I can't find it again

A couple of weeks ago, I stumbled on a particular chip. At the time I didn't need it, but now I do and I can't find it again. The chip was a 4-16 line demultiplexer, but its input came from an I2C ...
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what were the ENIAC's equivalent to the modern CPU's elements?

If a modern CPU contains these elements: - 3 or more register units - ALU - control unit and the CPU is connected to a RAM composed of several addresses, what ...
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Encoder direction change during index pulse

I have a quadrature encoder with an index pulse, and I would like to keep track of angular position over multiple turns. The microcontroller I am using has counters that count both index pulses (...
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What is the bus width in this case?

Given the two 16-bit buses, D_0 and D_1, shown in the figure below, what is the bus width of the 2-input bus Y?
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Fast decoder with low propagation delay

I need to use a fast decoder to communicate with a SRAM memory, CY7C1041GN. The circuit I need to implement is the circuit suggested in the Example #5 of the document AN2408 .The suggested decoder in ...
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Address decoder design and memory tables (recommended books)

i have been self studying and i encountered with an exercise of address decoder design, i have seen videos and i have searched in this book "Digital design by M. Morris" which is the one im using for ...
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Binary Data encoding and decoding format

I am trying to understand what is the meaning of this data coding format as shown in the following image. It is not simple binary to decimal conversion. Can anyone tell how this conversion formula ...
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Digital project

i need some advice how to prepare digital electronic circuit. I have 64 signal lines, every line have a NO tact switch with latch . I need desiplay how much "1 or ON" signal i have and display this ...
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Decoder inputs needed given 32 registers

I have a couple of questions about decoders. My first is this: If I have a register bank with 32 registers, how many inputs are needed for the decoder and why? I think that you need 5 inputs for this ...
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Dynamically setting address of HT12E with Raspberry Pi

I have a project where I need to send a wireless signal to one of several receivers to turn on an LED. One transmitter, several (many) receivers, each with an LED. The receivers need to have low ...
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Design decoder with pass transistor

I'm trying to design a \$3*8\$ decoder using pass transistors. I found an implementation with TG on the web (transmission gate) as the following picture, but I can not design one with pass ...
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pausing d flip flop output

I want to make a digital timer that counts to 99 minutes 59 seconds the problem is that i want to use 4 digit 7 segment display so i have to oscillate the input of the bcd to 7 segment display between ...
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Design a circuit that takes a 3 bit binary and makes it (x^2 - x), using a decoder of your choice

i tried making the circuit for each output on its own then make the final circuit but i have a feeling that wrong any thoughts ?
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Implement decoder using simplified SOP

Implement Z using single 2x4 decoder with 1-enable and active low outputs without logic gate and no complemented literals Z = A'BC'DE + (D'+B)' + BDE My attempt at Simplified SOP ...
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How to generate 2's complement of a 3-bit number using 3:8 active low decoder?

This is previous year problem of a competitive exam. I tried by self but i was unable to solve it. Exact wordings of the problem: Generate 2’s complement of a 3-bit number (a2a1a0) using a single ...
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