A shift register is a cascade of flip flops, sharing the same clock, in which the output of each flip-flop is connected to the "data" input of the next flip-flop in the chain, resulting in a circuit that shifts by one position the "bit array" stored in it

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51 views

CD4015BC static shift register: technical specs question

Currently looking into the specifications of the CD4015BC static shift register, I came across a couple of specs for which I have some questions: 1) The clock rise and fall times should be below 15 ...
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1answer
30 views

Shift registers, understanding parallel-in serial-out

I have the 74hc597 parallel-in serial-out (PISO) shift register. The datasheet can be found here. I have a general idea about how serial-in shift registers (SIPO) work, but I'm having trouble ...
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0answers
65 views

A general purpose 16-bit shift register

I cannot seem to locate a general purpose 16-bit serial-in parallel-out shift register that is still being made. Although there are plenty of LED drivers that can adapted for the purpose. All I need ...
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1answer
21 views

8-bit Serial I/O Parallel I/O Bi-Directional Shift Register [closed]

I am looking for a register that has as stated Serial In Parallel Out and Parallel In Serial Out modes and bi-directional shift functionality all in one IC. I want to use it with Arduino. Does ...
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3answers
57 views

shift register RGB led brightness

I'm currently using 74HC595 shift register to light leds. Recently I decided to start using RGB leds instead of simple 1-color leds. Which means that I now have to ...
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2answers
53 views

Driving two large 7-segment displays using Arduino and shift registers

I recently started a project in which I want to control two 7-segment LED displays using two shift registers (74HC595) and my Arduino. I thought I had the basic ideas mastered, but I ran into some ...
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2answers
45 views

Shift registers in series

If we have for example 3x16bit shift registers connected in series, can we clock 48 bits of data through one shift register at once and then latch all of them to output data registers, LATCH CLK and ...
2
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2answers
232 views

LED hub purpose?

What is the main purpose of LED hub, is it used only for RGB matrices to connect shift registers for every color or there are some other applications? I'm working with HUB75 and that is the reason ...
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1answer
37 views

Shift register on sync RS flip-flop

I am trying to build serial-in shift register (non cycled) based on synchronous RS flip-flop, but i'v got a problem with synchronization. My clock generator was configured to long on period and short ...
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1answer
45 views

How can I use a single 74595 to drive two different IC's?

I'm trying to build an audio circuit with as few parts as possible. Also, I really need to limit the number of pins used on my Arduino. I didn't ask this in the Arduino site because I don't think ...
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1answer
38 views

Why has a LUT6 based SRL only 32 entries but not 64?

Xilinx FPGAs are capable of using LUTs as memory elements. The can be used as ROM, RAM and Shift Register (SRL). New Xilinx devices use 6-input LUTs, which gives 64x1 bit for RAMs/ROMs, but only 32 ...
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0answers
32 views

Sequence/Initial Polynomial of a LFSR

What is the "sequence polynomial" of a linear feedback shift register? I see it referenced in a text where it refers to the initial state polynomial divided by the characteristic polynomial. I know ...
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0answers
26 views

Data Transmission Including Lasers + Shift Registers

In a project we're doing we need to be able to transmit data through lasers. Data is just 4 bit binary numbers. So what we intend to do is have 4 Parallel in - Serial Out Shift Registers connected to ...
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1answer
62 views

Can use 17 resistors with 16 rgb led's?

I always see an rgb led ran with 3 resistors, for example a 20ma led on 5v power uses 150ohm's for red due to it's lower voltage but only 100ohms for green and blue. I am running 6 shift registers off ...
2
votes
1answer
79 views

Implementing feedback shift registers in a FPGA

I am not up on the latest FPGA capabilities. What would be the lowest cost FPGA chip that can implement 1050 linear feedback shift registers of 71 bits each register? The shift registers have to be ...
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1answer
55 views

Radix-4 multiplication problem

I'm writing code in verilog that take A,B as 8 bit input ,multiply them using radix -4 method . when i execute the code the shft output appear as "xx0" and mutipler can't take the value of the input ...
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1answer
70 views

High frequency SPI-like communication: is there any hardware allowing software tweaking?

I will need to communicate with a device using serial protocol mostly similar to SPI but with several changes: Data packet can has any bit length (e.g. 35 bits) Stop sequence formed by lack of ...
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1answer
71 views

Voltage used up by a transistor and shift registers

i am on a project 8x8x8 LED cube and I am stuck on the value of register i should use. Talking about single layer I am using 2N5296 transistor for common cathode and 8 shift registers for controlling ...
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1answer
53 views

Do shift registers refresh?

Say there are 2 Shift Registers chained together with the following values SR1 : 11111111 SR2 : 11001111 The data is written to SR1 and then to SR2 like: ...
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0answers
55 views

Reverse Shift Register?

I'm super new to electronics and am wondering if there is anything that behaves like the reverse of a shift register... as in parallel in and serial out instead of serial in and parallel out. I know ...
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1answer
31 views

4-bit Register with Four Operations

I'm given a task to design a 4-bit register using D Flip-Flops (and MUXes) that operates according to the following selection inputs: When.. S1S0 = 00, No Change; S1S0 = 01, Register is Cleared to ...
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0answers
121 views

Design serial adder for 16 bit register using on full FA

I wrote a serial bit adder for a 15 bit width shift register and a full adder (positive edge trigger, asynchronous reset) I don't know where the error in this code is. This is the code: ...
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1answer
58 views

Running a 7v shift register from arduino 3.3v

Im trying to learn some electronics, so im not that confident with some of these systems, I recently bought a load of the alphanumeric displays from Sparkfun but foolishly read the data sheet for ...
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1answer
130 views

No output or invalid output on a 74HC595 shift register

I have a PIC18F2550 microcontroller on one board with three daisy chained 74HC595 chips. These are driving 7-segment displays and everything is working fine. 7-segment displays are connected with a ...
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0answers
42 views

Shift register HC164 sensitivity issue

I am controlling 5 shift registers (74HC164) from TI's cc3200 launchpad. I am clocking the data using GPIO pin and controlling LEDs though it. But my shift register is giving weird results. It gives ...
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2answers
29 views

Shift register 5V VCC and data while 3v3 serial?

I want to use 5V for VCC and data pins for shift registers (HC595 and HC165) with a common GND while using 3V3 clock, I haven't tested yet. But is it okay to do that ? or it will reduce IC life span ? ...
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3answers
462 views

Can I debounce after a shift register?

I am rewiring a cheap old organ for digital and want to use shift registers to read all the keys. Is it possible to debounce the keys after the shift registers, or do I need to do it before? Either ...
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1answer
135 views

74HC595 Shift register - output pin polarity

Most shift register tutorials I've seen have the output pins connected to ground (for instance: http://www.arduino.cc/en/Tutorial/ShiftOut), however I've seen at least one circuit that connects them ...
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2answers
105 views

Can a computer use shift registers as memory?

An 8 bit shift register stores a byte of information. Would it be possible (in principle) to create a computer that uses shift registers for memory instead of HDD technology?
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2answers
556 views

Shift register explanation (parallel in - serial out)

The task is to implement a 4-bit shift register with parallel input and serial output using JK flip-flops and standard logic gates. The solution is below: This is what happens on the output: I ...
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1answer
125 views

Looking for a way to output 100-144 Analog Channels from Arduino

I've been searching for days and found 2 ways that could work, but not sure about implementation: Using shift registers like in: ...
2
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1answer
108 views

How can two separate devices send clock data to a shift register IC?

I'm using a microcontroller to clock a byte into a 74HC595 shift register and latch it. It then sends a signal to the other device which send 8 clock pulses when it is ready to receive the byte. So ...
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1answer
107 views

Generating pseudo-random numbers with restricted hardware

I have a need to generate a 448-bit value that appears random, for use in a test circuit. The "randomness" of the values is not overly important; the size of the generator hardware is. I am using an ...
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2answers
202 views

PN sequence generator using linear feedback shift register in VHDL

I got a code for PN sequence generator using linear feedback shift register in VHDL. I am using 1010 as a initial seed but in the output all the four PN sequences ...
2
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2answers
137 views

Shift Register Programming with 8 and 16 bit drivers

I built up a test circuit using 2 74hc595n shift registers to control a total of 16 leds with success. In the interest of saving space, I designed my circuit board to use one STP16CP05MTR shift ...
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2answers
161 views

Best way to use multiple decoders for an LED matrix

I'm designing a 16 x 32 RGB LED Matrix and its controller / driver board. So I've designed a couple of solution approaches and I'm wondering if there is a better way to drive multiple 4 to 16 line ...
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3answers
188 views

74hc595n shift register error

I want to put in series 2 74hc595N . I made the schematic from here: When I send a value the first register sends it also to the second one. I have same value on both. I change them (master/slave) ...
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0answers
75 views

How to increase number of LED blocks in a moving LED display

I have been working on a project where I have to make an 80x20 sized moving LED display. I'm using a decade counter to shift the characters being displayed. I want to know, in the programming ...
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2answers
307 views

Design a 4-bit PISO shift register with 4 DFFs and 3 AND gates

I want to design a 4-bit PISO shift register with 4 DFFs and 3 AND gates. I have gone so far that these two designs can be implemented, but I can't go further minimizing it so as to use 3 AND gates ...
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1answer
178 views

Emf interference on arduino and breadboard , using 74HC595 shift register, how to prevent it?

I’m using a 74HC595 chip (shift register) NPX semiconductors, connected to and arduino board. Basically the shift register switches on and off 8 leds in sequence. Everything seem to be working, code ...
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2answers
162 views

Building circuit for n-relays using flip flops, is this the best solution?

I'm trying to build a circuit for n relays, each relay should hold it's state (ie latched). My first Idea was to use decoders, but clearly this was a bad option, since the state of the relays won't ...
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votes
2answers
389 views

Why is shift register very important?

I learned about shift registers a few weeks ago but I don't know why it is very important and everyone said that it is necessary for microcontroller, etc. Please make sense for me.
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1answer
119 views

Increase toggling speed of PNP for PWM

I got a shift register which I use to PWM LEDs. Since I multiplex this toggling I noticed some "afterglowing" if the next LED is not active of the same color. (RGB cathode) Multiplexing by the MOSFET ...
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1answer
289 views

What are Vcc and GND on a shift register?

What are Vcc and GND on a shift register? I thought that I had to provide a positive voltage to the IC via the Vcc, but turns out that I can operate my shift register without powering the Vcc. ...
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1answer
59 views

Help designing a serial adder [closed]

I need to build a circuit that adds two n-bit 2's complement numbers. the two numbers have to be stored in shift registers. The circuit should start with the least significant bits of each number and ...
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1answer
89 views

FSM for predesignated process (How to draw the state diagram)

let me start by saying this involves some homework problems so if you could help guide me a bit I would greatly appreciate it. I have been working with finite state machines for a bit in my course ...
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0answers
81 views

Parallel-in, parallel-out, universal shift register

I am trying build circuit of parallel-in/parallel-out universal shift register. I have found circuit in the Internet. Here it is I have tried to do this using MicroCap , but it doesn't work as ...
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4answers
186 views

Shift Register Counter

I am working on a project with my MBED microcontroller and I'm running into some snags, because I'm new to it and getting myself confused with how exactly everything works. I have my MBED hooked up ...
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1answer
49 views

Parallel-In-Serial-Out with Parity?

Can someone recommend a shift register IC with integrated parity or CRC generator? Is there such a thing anyway?
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1answer
45 views

HCF4021BE usage w/ uC

http://www.datasheetarchive.com/dlmain/Datasheets-30/DSA-599035.pdf The above datasheet is useless to me. (I do know my way around a datasheet somewhat, though) 1) Can someone explain how the heck ...