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# Linear Feedback Shift Register

22 Threads found on edaboard.com: Linear Feedback Shift Register

## Is it possible to generate random Boolean functions of the state element bits?

Yes, Implement a linear feedback shift register and make it your state register. - - - Updated - - - process ( LFSR ) is begin case LFSR is when "000" => -- do something when "001" => -- do something when "010" => -- do something when "011" => -- do something when "100" => -- do some

## voltage source whose duty cycle is random

THe Pseudo Random-Bit Generator Source or PRBS is defined in CHapter 5 of the manual There are many variables based on linear feedback shift register (LFSR) Certain comibinations of taps and length of shift register are chosen for "maximal length sequence" (MLS) YOu may only be concerned (...)

## Linear Feedback Shift Register

Can anyone help me understand that how does a LFSR (linear feedback shift register) implement division required for CRC (cyclic redundancy check) ?

## frequency characteristic of pseudo-random sequence

Is it the same as the white noise which means the power is equally divided in the whole frequency range? If so, how does it come? Any reference is preferred. Now I've built a pseudo-random sequence using linear feedback shift register(LFSR), and I'd like to check its power spectral, is it possible to make it out using (...)

## Doubt regarding the Cyclic Redundancy Check (CRC) in USB2.0

The protocol specification usually defines CRC in hex or polynomial notation. For example, CRC5 used in USB 2.0 protocol is represented as 0×5 in hex notation or as G(x)=x5+x2+1 in the polynomial notation. This CRC is typically implemented in hardware as a linear feedback shift register (LFSR) with a serial data input

## how to generate Random square pulses

Usually, a feedback shift register is the answer linear feedback shift register - Wikipedia, the free encyclopedia

## Determine the characteristic polynomials of short PN sequences

For maximum length LFSR polynominals, see linear feedback shift register - Wikipedia, the free encyclopedia If you want other than maximum length PN codes, you should tell a specification first.

## how to vhdl code for random number generator

I have code for linear feedback shift register. It is not a random number generator in the strict sense. But must be useful in some cases.Download it from opencore.org: LFSR-Random number generator :: Overview :: OpenCores

## i want vhdl code for signature analyzer for built in self te

i want vhdl code for signature analyzer for built in self test circuit... i can use 8 bit linear feedback shift register(LFSR) na?i am trying using 8 bit LFSR

## Perform run and correlation property on matlab..

Please help guys.. i need to perform the run and correlation property on a stream of bits that has been pseudorandomly generated. I have used the following piece of code: e.g x= randn(10,1)>0.5 to generate random bits of 0's and 1's. Is this the correct way of doing it or do i need to pass through the linear feedback shift (...)

## Eye diagram measurements

Signal source is a (pseudo-)random sequence generator. Oscilloscope must have external trigger input, use sequence generator clock as trigger signal. To measure, hook up oscilloscope to end of transmission media (receiver side). To implement a sequence generator in HW, google 'linear feedback shift register" for (...)

Hi All, I have to write the scrambler code in verilog. The scrambler is LFSR(linear feedback shift register) based. The 23-bit polynomial for the LFSR is G(X) = X23 + X21 + X16 + X8 + X5 + X2 + 1 The main problem I am facing is finding the value of LFSR after 8 serial clocks (1 bit advanced in each clock). There are 2 (...)

## help on vhdl (designWorks4) generate 4 random numbers(4bits)

The keword is LFSR (linear feeback shift register). A feedback expression can be selected to achieve a maximum sequence length, this means all possible codings in the register execpt the all zero case, corresconding to a 2^n - 1 pseudo random bit sequence length. You can find e. g. VHDL code examples at (...)

## doubts on LFSR(linear feedback shift register) used in BIST

Hi Neetin, 2. How we choose cherterstic polynomial for lfsr? The characteristic plynomial is the LFSR connection which will give the maximum number of random values before it starts to repeat the values. Each LFSR will have a characteristic polynomial, which is pre-determined. There are equation to find that, which I

## How does Linear Feedback Shift Register work?

Good links to understand LFSR concept:

## On what basis we choose a polynomial equation?

Hi All, I am designing "Data Randomizer" in verilog in which i am using a polynomial. G : x16 + x13 + x12 + x11 + x7 + x6 + x3 + x + 1 My Query is : On what basis we choose a polynomial equation and if we implement this equation using LFSR(linear feedback shift register) where to place tabs for output ?

## how to design a pattern generator on chip?

random pattern?? -> use LFSR (linear feedback shift register)

## Help! Who knows the pseudo-random binary sequence?

A linear feedback shift register (LFSR) is an easy way to generate a pseudo-random bit stream in hardware by using a shift register and XNOR gate. Here are a couple of Xilinx app notes, and HDL examples:

## Why are we using EX-OR operation in block and cyclic codes?

hi, try to find this excellent book covering your questions: Solomon W. Golomb, shift register Sequences, Aegean Park Press, California, 1982. XOR gates give, in the case of binary system, linear addition, which is needed to form a linear-feedback shift registers, (...)

## Scrambler - simulating a modem in Matlab

I see this problem like this: every tap (in your case x**14 and x**15) in LFSR (linear-feedback shift register) of your polynomial adds one additional error in the receiver. So the sum of all errors is three since original error plus two tap errors equals three. I'm not sure about your code since I don't understand the (...)