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From: rbala4ums at hotmail.com<rbala4ums@h...>
Date: Thu Sep 20 10:53:30 CEST 2007
Subject: [oc] Who is going to work on cores?
Hi Dhawal,

While creating the core, check the option of "Signed Representation"
or something of that sort, if you create the core using Coregen
Wizard, it will be 2-3 steps generation, i suppose it comes up in the
first step itself, and it will ask for the convention of your input,
and select signed representation there, and while giving testbench,
give the input as 16'b1000011101011100. It should work hopefully.

Thanks

Balaji R


----- Original Message -----
From: Dhawal Kadao<dhawal.kadao@g...>
To:
Date: Wed Sep 19 06:03:12 CEST 2007
Subject: [oc] Who is going to work on cores?

> Thanks Balaji,
>
> I will read the documents related to number representations. But
> one small
> question if I need to input the value -0.9425 to my fft core in 16
> bit
> format what should be my approach.
> the twos complement representation of -0.9425 in binary format is
> 1000011101011100 while 0.9425 in binary format is 0111100010100100.
> From
> this I understand that first bit is the sign bitand rest of the
> bits
> represent the fractional value of the number.
> Now the problem is how should I represent 1 and -1.
> On 9/18/07, attachment.html
> > > Take a good look at it and it'll answer your question. By
> the way,
> > > integers are integer numbers.... that is: they don't ever
> have a
> > > fractional part.
> > > Regards,
> > > Víctor López
> > > Dhawal Kadao escribió:
> > > >
> > > > Thanks Balaji,
> > > >
> > > > I have a problem in deciding the format of the input
> data
> > > stream. How
> > > > to set the format while i input the data through
> Test bench. I
> > > am
> > > > using twos complement format to input negative
> numbers.
> > > > For example: My data word is 16 bits. So how are the
> bits
> > > assigned?
> > > > What I understand is 1 bit is sign bit, one bit for
> intefer
> > > and rest
> > > > 14 bits for fractional value. Is this format correct
> or is
> > > there a way
> > > > to define the input sequence.
> > > >
> > > > Regards,
> > > > Dhawal.
> > > >
> > > > On 9/15/07, *rbala4ums at hotmail.com
> <mailto:rbala4ums at
> > > hotmail.com>*
> > > > <rbala4ums at hotmail.com <mailto:rbala4ums at
> > > hotmail.com>> wrote:
> > > >
> > > > Hi Kadao,
> > > >
> > > > Xilinx's IP cores are made so easy that it is very
> much
> > > explanatory on
> > > > its own. You can get reference materials on IP cores
> by doing
> > > a
> > > > google
> > > > search like "Xilinx IP Coregen Memory
> cores" or blah
> > > blah blah....
> > > >
> > > > if you need info on any particular or specific core,
> you could
> > > > actually open a Xilinx project in ISE, add the core
> as a
> > > component,
> > > > and while generating the core using Xilinx's Coregen
> Wizard,
> > > you will
> > > > actually see a tab or link stating "More info
> on the
> > > core" if you
> > > > click that, the wizard directly opens the pdf doc
> about the
> > > specific
> > > > coregen component on a new browser. That is the best
> way to > > > get info > > > > on any particular core. If you need help on > instantiating any > > > core, > > > > you will have to do a google search on some > examples. > > > > > > > > There are lots and lots of tutorials written by > xilinx, and by > > > > students of many many research groups from various > > > universities that > > > are openly available on > the internet, it just matters on what > > kind of > > > > key words that you use in google. Better you use, more results > > > you > > > get. > > > > > > As > i said FFT's and Memory cores are the most popular cores > > > that are > > > being used by so many people, so it should > be easier to find, > > also you > > > might want to > do a search in "Google's Code Search" > > also, you > will > > > find so many examples(though most results are > from the > > projects of > > > open cores) but you > will get some good results on that too. > > > > > > > Thanks. > > > > > > Balaji R > > > > > > > > > > ----- Original Message ----- > > > > From: Dhawal Kadao< dhawal.kadao at g...> > > > > To: > > > Date: Fri Sep 14 16:34:56 CEST 2007 > > > > Subject: [oc] Who is going to work on cores? > > > > > > > > Asim, > > > > > > > > > I am working on Xilinx ip cores. I have to use fftcore > > > and memory > > > > cores in > > > > my > project. I need some reference material and help woth > > my > core. > > > > Thanks, > > > > Dhawal. > > > > > On 9/13/07, asim shehzad <attachment-0001.html > > > > > > > > > > > > > _______________________________________________ > > > > attachment.html > > > > > > > > > > > > > > ------------------------------------------------------------------------ > > > > > > > > _______________________________________________ > > > > attachment.html > > > > > > _______________________________________________ > > attachment.html > -------------- next part -------------- An > HTML attachment was scrubbed... URL: attachment.html >