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22 Threads found on edaboard.com: Fixed Point Division
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)
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 (...)
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 (...)
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 (...)
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 is just integer arithmatic.
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
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 (...)
i wanted to implement fixed point format division in verilog. can anyone help me?
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/ (...)
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.
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 (...)
Hi, maybe this links helps ) High speed fixed point division in FPGAs ECE 645 Spring 2009 regards
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
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
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.
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.).
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
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.