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# Fixed Point Division

22 Threads found on edaboard.com: Fixed Point Division

## Why no Multiply and Divide for Q15 Fixed Point?

After spending the past few days getting the fixed point library to actually build, I was shocked to see that there are only Add and Subtract functions in the libq.h First question is why no Multiply and Divide? After playing around, I did get the the following code to multiply and give the correct result: _Q15 a1 = _Q15ftoi(0.25)

## -.5 representation in binary

hi .. in division that includes fraction , i am using fixed point the division includes negative numbers too..but i have a problem . For negative numbers i am using 2's complement methode and i dont know how to represent (-.5) using 2's complement. is it possible to represent numbres like -.25 (...)

## division in FPGA using verilog

Hi, I am trying to do a code for do division using verilog that is work with fpga. The thing is division operator is not syntyhesizable.I am using fixed point arithmetic to represent a number (includes fraction),think the only methode to do it is loop baised substraction methode or quotient remainder methodeIis there (...)

## vhdl output from division operation

Read a fixed point notation like A.B as N_integer_bits.N_fractional_bits. As you are using regular integer division, you get quotient_fractional_bits = dividend_fractional_bits - divisor_fractional_bits. For > 0 fractional result bits, you can add bits to the right of the dividend. Or use the IEEE fixed (...)

## vhdl code for division of two fixed point numbers

yes, the simplest VHDL is: output <= input1 / input2; using the numeric_std or fixed point library. But this will only produce a maximum pipeline length of 1. To get better pipelining, you need to use a divider IP core, which is provided by both altera and xilinx.

Google around for "verilog fixed point" and you'll find some inspiration...

## Fixed-point division in VHDL

fixed point is just integer arithmatic.

## Fixed-point division in C

Hi all, Does anyone know of a division function in C for fixed-point numbers? I am using ac_fixed header but apparently that doesn't work since I'm getting zeros when I do 1/a where "a" is a fixed-type with values between 30-60. Thank you, Elnaz

## Arithmetic functions for fixed point [VERILOG]

Hello, I need to 1. convert integer to fixed point 2. Then perform functions such as division and exponential equation Do you know any library or function for this? I know about mega functions but that is for floating point and it will require alot of resources that will be needed for other computations in my (...)

## fixed point division in verilog

i wanted to implement fixed point format division in verilog. can anyone help me?

## build fixed point vector from 6 integers

hi all i need yours help for some little implementation algorithm in FPGA i am using uart that gives me 7 bytes of ascii codes , 6 bytes on integers and one byte of point in that way XXX.XXX i need to create a floating point vector - i mean to sub x"30" from each integer byte and collect the integers to floating point vector/ (...)

## How to synthesize sfixed division.

what problem are you getting? general refusal or timing failure? I would never use the "/" operator directly because it offers no pipelining. For a decent clock speed, you will need several pipelining stages, which is probably why you are getting failures. Altera and Xilinx ofer fixed point divider IP blocks.

## lookup table using vhdl:

Arithmetic functions (e.g. sqrt, division) are operating on numbers, not bits. These numbers have a digital representation. The first point, when thinking about lookup tables, is to specify numeric ranges and resolutions, then about a suitable numeric format, mostly fixed point. There's a large amount of contributions (...)

## what is the most efficient algorithm (area wise) for 16 bit/16 bit division in VHDL?

Hi, maybe this links helps ) High speed fixed point division in FPGAs ECE 645 Spring 2009 regards

## floating point computation

You have to do it by hand, using shifting operations for multiplication and division. I had a similar situation for color conversion functions. I replaced floating point operations to fixed point operations. Target multiplication and division operations first. -- Amr

## 24 bit by 24 bit division in vhdl

So the value will always be between 0 and 1 and I require upto 3 decimal places. Binary arithmetic doesn't know decimal places. You have to choose a suitable representation for the result first. My suggestion would be a binary fixed point format with a factor of 2**10. It can be easily achieved by extending the numerator to 34 bit

## verilog code to find mean of 20 numbers

Today's HDL synthesis tools don't support Verilog or VHDL floating point type, but you can use fixed-point techniques instead. For example, 0.02 is approximately equal to 1311/65536, so you could multiply by 1311, add 32768 (for rounding), and then right-shift by 16. For higher accuracy, use larger terms in the ratio.

## Fixed Point division in VHDL

Hello dear, I need algoritm/ guideline on fiexed point division in vhdl. Secodnly, how to check that in how many cycles FPGA performs an operation(i.e. +, -, / etc.).

## signed n in qformat Division

hi everyone can anybody help me in writing a code in fpga for divsion division which is for signed number s n also for fixed floating point plz thanks

## A MICROCONTROLLER WITH FPU!

Hola namqn, I recall a FPU, probably that one, which had a fixed delay for reading its data of about 200 usec? Is it this one? Good to keep in mind, before buying.