Unsigned subtraction

[andrew_ross]

Hi guys..
I have to use a carry look ahead adder component (32bit), to implement a module able to perform addition (both signed and unsigned) , subtraction(signed and unsigned).
The only issue is the unsigned subtraction...how do I can do it? (in signed case I convert the number to 2's complement)..
thanks in advance..

andrew r.

 

[jeppe]

Hi
I got a feeling that the signed/unsigned part comes free - if you just implement the circuit for addition / subtraction.

You can find a lot of inspiration at this site.
http://tima-cmp.imag.fr/~guyot/Cours/Oparithm/english/Adspec.htm

Jeppe

 

[andrew_ross]

Thanks a lot..I'll try right right now..