OPENCORES.ORG

helo ppl !

Or use the cordic core, which is available from opencores.
Richard

-----Original Message-----
From: cores-bounces@o... [mailto:cores-bounces@o...] On
Behalf Of Abhijit Krishna
Sent: Saturday, March 18, 2006 4:41 PM
To: Discussion list about free open source IP cores
Subject: Re: [oc] need of core implementing tan inverse function in vhdl

hi siddharth.
i am working on trignometric tables myself so this is just a guess.
Try to implement it using a lookup table. Store several values of tan
inverse for angles 0 to 90 depending on the accuracy you desire. i.e.
when p/q is expressed in 8 bits you can have at most 256 entries in
the lookup table. Store this table in a an array of registers. make a
decoder which selects the appropriate register for a given
value...blah blah blah...

-Abhijit

On 3/16/06, spy_dy172000@y... <spy_dy172000@y...> wrote:
>  helo ppl  !
>
>                i am siddhartha working as a vlsi engg in front end i
> badly in need of an ip core which deals with the tan inverse function
> i had been facing this since 2 weeks.atleast the logic behind this wud
> be appreciated if not the core i badly wana implement trignometric
> functions specially tan inverse in vhdl taking 2 binary 8 bit inputs
> and remenber THESE INPUTS ARE THE AMPLITUDE VALUES OF THE SIN AND
> COSINE WAVES I HAVE GOT AND THRU THAT I HAD TO DEVELOP THE CORE TO GET
> TAN and implement the tan inverse function ly which would be the final
> result .
>
>     ex : lets p and q are the 8 bit input data implementing p/q as a
> division operator we shud alsoimplement tan inverse on p/q,thr ends
> the prj.
>
>          hope u got it .....i think it wud be a challenging project as
> far as my experience is concerned......i wud appreciate on each and
> every reply u gona make on this prj.....
>                                            regards....siddhartha.
> _______________________________________________
> http://www.opencores.org/mailman/listinfo/cores
>
_______________________________________________
http://www.opencores.org/mailman/listinfo/cores