Hi every one

How to initialization and perform division for below statment in VHDL.

(a/b) =(a*d)/(b*d);
Thanks in advance

What are a,b,d ? Signals ? Constants ?

sebx86 thanks for your intrest

a,b,c,d are variables.

That is a mathematical equality. It solves to (a/b) = (a/b).
What exactly do you need? Do you need a synthesizable circuit?

When those variables are represented in a digital number format, the operatons will be subject to rounding and truncation, and (a/b) != (a*d)/(b*d). Furthermore, it is not clear if you want a circuit to test the identity, or if you want to solve for one variable given the others, or if you want a symbolic solver.

In VHDL, you must define the format of those variables (type), and you must implement the operations '*(a,b)' and '/(a,b)' for the type. Although there are predefined numerical types with math operations, they may not be sinthesizable. That is because a multiplier can be implemented in several ways, and division is usually more expensive. Almost always, the number format will require loss of precision and quantization decisions that can yield small differences in the results of such expressions as yours.

So, what are your requirements? Do you need a circuit that will always evaluate the above identity as an equality, regardless of the a,b,c,d values?

- Jonny

Thanks for your reply.
I doing below operations to perform denominator of then two statments are same for testbench.
(a/b) =(a*d)/(b*d);
(c/d)=(c*b)/(b*d);

Sorry, I can't understand. Can you provide more information? What is the type of the variables? Can you show actual code for your testbench?

Thanks for your intrest. actually i try to find out max of two rational numbers.i implemented in package,but how to implement in testbench?

use IPcore in Xilinx to perform division and multiplication operation..