Unable to carry out mod function.

[yongsong]

Hi,
whenever i include a 'mod' function in my code, an error will occur during synthesis where it state that a modular function of 2 must be carry out.
May i know why is this so and is there any way to carry out a "mod" function? (wat i'm doing now is to loop a subtract for a number of times till i got the intended result.) thanks.

Best Regards,
Yong Song.

 

[fsujoe]

I have had the same problem, and determined that it was impossible to accomplish what I wanted in Xilinx. I coded a mod component that was a state machine implementing Booth's algorithm.

 

[crpasam]

I generated core from core generator for single port block RAM and I dont know how to instantiate it from a VHDL program. I generated a file with extension .xco. could u help me how to instatiate it.

 

[RVSachin]

Most of the synthesis tools do not support any of the division operations, including the mod operations for when the right side operator (... the divisor) is not a value equal to some power of 2. That is, if your expression is
a mod b,
then b has to be a value which is a power of 2. If you want to implement this operation for all values of b, then you have to write your own code using some division algorithmns to implement such a function.