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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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51 views

Converting Pulse Sequence Inputs Into Separate Outputs

I'm trying to find the simplest way of accomplishing the following task: Convert 3 different pulse input sequences into one of 3 different output lines The image below explains the problem ...
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Converting 4 4 3 -2 Weighted Code to BCD using Decoder

I've been trying to solve a question - Design a 4 4 3 -2 to BCD converter using decoder. My attempt at the question was to make the truth table for the 443-2 code and then write the binary ...
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117 views

Multiplexer handling 16 bits

Design the VHDL components (Register, Decoder, and two Multiplexer 16 bit) and interconnect them to build a register file. The schematic shows only four registers. Your solution should implement ...
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2answers
63 views

Building a BCD to 7-segment using 3x8 decoder

So.. I know how to build a BCD to 7-segment using 3x8 decoder but the question provides 4-digit binaries and asks to only input 3 of those.. my question is that won't two different digits be regarded ...
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25 views

Combining two schematics of 1kx3 NOR MOS PROM components into a 2kx6 PROM component

Today after class we were left with an exercise of creating schematics and combining two components we learned about today. The exercise is to combine two 1kx3 NOR MOS PROM components into a 2kx6 PROM ...
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2answers
160 views

7 to 128 decoder in Verilog

I'm new to digital electronics and programming in Verilog particularly. I have programmed some basic programs like 2 to 4 decoder, and 4 to 16 decoder. But I am trying to make an image sensor and say ...
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2answers
71 views

How to invert the output of 74138 IC?

I have this incomplete circuit. I want to know if there is any other way ,except inverting each decoder's output or making changes in any other IC, to make the desired output be H and the others L?
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213 views

Difference between multiplexer and decoder

What is the difference between a multiplexer and a decoder? Lets assume a 2-to-4 decoder and a 4-to-1 multiplexer, what I understand is they both select one input based on the selector's combination. ...
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72 views

I have miss-sync PAL frames (pictures inside)

In some cases I get this picture: And sometimes I get that picture: analogue camera -> TVP5150AM1 -[external sync discrete VSYNC|HSYNC]-> STM32H7_DCMI I could correct the second picture with offset ...
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2answers
86 views

Why do I Have 800 pixels in PAL video line

I have a DCMI peripheral (STM32H7) that receives video data from TVP5150 with discrete VSYNC/HSYNC. I have 306 (it should be 305, but there is a chance that this is because of the way I count number ...
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1answer
76 views

How can I determine a resolution of 4:2:2 YCbCr image?

I fetch data from 420 TVL camera, and now I just want to see this image, the only thing I need is resolution to draw it on my screen. How can I determine this? BWP M420MD -- camera, I'm getting DCMI ...
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1answer
68 views

Reimplement circuit using 1 2x4 decoder and 2 logic gates

I am a Computer Science undergraduate taking a module on Computer Organisation. There is this typical circuit design question that always appear in my assignment and I'm not sure what is the standard ...
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2answers
521 views

Implementing a function using decoder, encoder and some gates

Implement the function F(A,B,C,D,E) = A’B’C’DE’+ABCD’E using only the components required from the ones given below: One 3:8 decoder with active high outputs and an active high enable input One 8:3 ...
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1answer
243 views

PIC - Problem in NEC IR Decoding in PIC12F675

I'm using PIC12F675 with internal OSC running @ 4MHz. I'm using MikroC Pro compiler version 6.6.2. To Decode NEC protocol, I'm not using Timer or Interrupt. I used delay command to make the code as ...
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1answer
68 views

SRAM Decoder Size [closed]

What is the typical area taken by address decoder logic in a SRAM? Could someone post area breakdown for each components in a SRAM?
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48 views

Why do we need an (adaptive) equalizer when we have a matched filter at the receiver?

When both can perform the same task of reducing the effects of ISI, why use both and not just one at the receiver end?
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1answer
165 views

Internet Radio Device with batteries [closed]

I have an project that I will make connection with Internet and listen a stream(in my case IP:port online radio station) then decode the music and transmit it to speakers connected to the ...
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1answer
43 views

Tail biting Convolution Encoder

I understand how encoder and decoder works but what are theses values ??
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1answer
253 views

CRC hardware implementation

What is the difference between these two implementations as the feedback is in first implementation the last reg only but the second implementation last reg xored with the input bit, so, what is the ...
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3answers
75 views

verilog assign memory in a memory

I want to assign a memory 64x6 in a memory 64x6 by saying that all the 64 rows in memory_2 will be equal to all the 64 rows in memory_1, how to make that in verilog ?? knowing that it is very easy in ...
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2answers
255 views

What kind of serial communication is this?

I am trying to reverse engineer a serial communication between to microcontrollers (1 device & 1 microcontroller on a board). One MCU validates the other MCU and I want to crack the validation and ...
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16 views

rateless code is worse than purely retransmissions in single link scenario?

As the title says, I found that the rateless code or fountain code is only optimal in multi-cast scenarios, i.e., multiple link transmission. In single link transmission scenarios, the retransmission ...
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1answer
861 views

How to implement 8x1 multiplexer using 3x8 decoder and 3-state buffer

Suppose that AB and CD are 2-bit unsigned binary numbers (a) Find the truth table for the function F with 4 inputs A, B, C, D to satisfy the following condition if AB >= CD, then F = 1, otherwise F =...
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2answers
104 views

Sampling (reading) a digital data signal?

I'm currently working on a project, where I have an external device (POCSAG pager - POCSAG protocol) that is giving out a digital (5V - 0V) square-wave signal. I have an ATmega2560 (Arduino) ...
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1answer
66 views

inverting address decoder with low after high

I have an 74137 address decoder and know how to build one like that from basic gates. But in my use case the address decoder is connected to the enable pins of a number of bus drivers and I fear this ...
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46 views

How to implement an decoder

I have to implement an decoder from truth table and SOP function, my question how many outputs and inputs can I get for this decoder? My answer to confirm
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2answers
72 views

Infinitely expandable binary decoder circuit

I tried to make some binary to decimal decoders, but I had no idea how to build them, so I ended up using the "combination checker" (basically providing one checker for each number). That was really ...
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2answers
185 views

How to connect two FPGA boards - VHDL

Hi all, I am trying to figure out a way to connect two fpga boards (like in the image) for a Morse code decoder/encoder. Our first plan was to make the decoding and the encoding in the same board ...
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1answer
400 views

4 to 16 decoder made by two 3 to 8 decoders not working properly

I have a function f(x,y,z,w)=x.y.z+ y’.z’+x’.w’ and I need to make a circuit using two 3 to 8 decoders, an inverter, an or gate with as many inputs as we want (I use two because I need a 9 input one ...
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1answer
248 views

Changing an active low decoder to active high?

I apologize if my question sounds stupid, but I'm a novice and trying to explore all of my options. I currently have a 4/16 decoder, but I did not realize it was active-low and what I really need is ...
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0answers
94 views

Which types of shift register counters require the most decoding circuitry

I'm studying digital systems through the book of professor Ronald Tocci, focusing on the counters chapter. In the review section, I encountered a question asking "Which shift register counters ...
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1answer
235 views

Truth Table for the Following Multiplexer Circuit

Is the truth table (shown below) accurate for the decoder/multiplexer circuit (shown farther below)? ...
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0answers
594 views

How to write a program for 4-Bit CPU made in Logisim?

So I finally got my 4-Bit CPU working on Logisim, and am trying to get it to do commands and display them, but am unable to do so. My CPU looks like the following: I am trying to implement the ...
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2answers
49 views

Creating a Decoder

Let's say I want to create this active low decoder: ...
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1answer
536 views

7-segment display BCD decoder with normal hex values [closed]

I'm trying to find a 7-segment display BCD decoder IC with normal HEX display. Most of the decoders that I managed to find have an output like this: These hex values just look awful. I previously ...
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1answer
54 views

Data Path Routing or Switching for AFE circuit

Currently i am making the PCB (for analog front end) for the digitization of some sensors(electro-chemical and photo-ionizations). To simply the things this sensors are giving output in Milli volt(...
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2answers
106 views

How do I control ten lightbulbs individually using one wire and processor? [closed]

Completely new at electrical engineering. My only degree is in Comp Sci. I want to know that if I had something like a raspberry pi and a power source, how can I use them to turn on and off ...
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3answers
328 views

darlington transistor led matrix

I want to run an 8x8 led matrix by using a darlington transistor arduino and decoder. for some reference I was looking at this previous question(Darlington Transistor Array). Each of my Leds draws ...
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2answers
396 views

Mod 6 counter that counts 1-6 on a 7 segment display (FIXED) [closed]

I fixed the problem, thank you all for your help, I posted the entire circuit, for anyone in the future who has a similar problem. [![enter image description here][2]][2]
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1answer
41 views

Decoder with many output combination

Is there anyone there that has knowledge if such IC exist? i search in the internet for years like on distributors etc but somehow I can't see any (maybe i don't know the right term or keyword for it ...
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1answer
129 views

Understanding Address decoder

Given is 3-to-8 decoder. There is 3 selection lines C, B, A (C=MSB and A=LSB) and one enable input. In total here are 16 adresses. So first we're going to discuss only EN_A. How many address ranges ...
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1answer
488 views

Implement a function 3x8 Decoder with 4 variables

I'm required to implement a function (F = ~ABC~D + ~A~B~C~D + ~ABC + B~CD) using a 3x8 Decoder and any other additional combinational logic. How can I implement this function if there are 4 ...
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1answer
280 views

Building a 4x16 decoder with only four 2x4 enabled decoder

I am trying to build a 4x16 decoder with only 4 decoder.. I've just made this. Basically each decoder has 2 enable signals. Is it correct?
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1answer
242 views

Design logic circuit to address 2 x 512 kB RAM and 2x1024 MB RAM with 36 address lines? [closed]

How do you address 2 x 512 kB RAM and 2 x 1024 MB RAM with 40 address lines? Memory is byte addressable, problem is to find out enough address lines to address all 4RAM and designing appropriate ...
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2answers
296 views

Pins in IC74138

IC74138(a 3:8 decoder) has 3 enable pins G1, G2A and G2B. Why are there 3 enable pins and what is the reason for that nomenclature?
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261 views

How does an active high decoder work?

I have a pretty good concept of Encoders and Decoders, but I can't get insight on the "Active High" keyword, and there are two enable lines which confuses me. I encountered the problem while working ...
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1answer
264 views

How to implement 8b10b en/decoding protocol between two FPGAs?

I'm using two Xilinx FPGAs (one Kintex 7 and one Artix 7). The Kintex 7 is tied to its own system (OPAL-RT software, it is a simulation software that is an addon to Simulink which lets data be output ...
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1answer
716 views

Truth Table for 3-into-8 decoder with N.A. inputs, P.A outputs and enable

I'm working on an assignment where I need to draw a block diagram and the gate-level circuit of a 3-into-8 decoder with negative active inputs, a positive active enable and positive active outputs. ...
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2answers
530 views

How has this Daikin control signal been encoded?

I just installed a Daikin split system (AC/Heat Pump) and would like to control it remotely. There are similar units available which can be controlled with an IR remote, but mine does not support this ...
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3answers
94 views

Can someone give me some ideas concerning the logic of a serial-parallel converter?

Seriously, I mean the "logic": not AND and OR gates, but the intuition behind it. This will be an investment of time for whoever answers, so I understand those who don't want to! I'm using this half ...