Re: [myhdl-list] Wraparound addition?

[Jan D. <ja...@ja...>]

Günter Dannoritzer wrote:
> Andrew Lentvorski wrote:
>> How do I add two unsigned intbv() objects such that the addition wraps 
>> around?
>>
>> Obviously, I can do the addition and then mask it and reassign like so:
>>
>> new = (old0 + old1) & 0xffff
>>
>> However, I doubt that is going to translate to verilog properly.
> 
> There had been a discussion about that feature back in June of last year 
>   on this mailing list. Here is a link to the achieve of that:
> 
> http://sourceforge.net/mailarchive/forum.php?forum_name=myhdl-list&max_rows=25&style=ultimate&viewmonth=200706
> 
> Jan had written some background information about the intention of intbv 
> there in connection with the wrap around functionality.
> 
> This might be a good question to be answered on the FAQ page.

Ok, what about this:

http://myhdl.jandecaluwe.com/doku.php/faq#how_do_i_describe_wrap-around_behaviour


-- 
Jan Decaluwe - Resources bvba - http://www.jandecaluwe.com
Kaboutermansstraat 97, B-3000 Leuven, Belgium
     From Python to silicon:
     http://myhdl.jandecaluwe.com