FPGA Central

Hi ng,

i try to understand the Xilinx Spartan2 pinout data sheet.
Some VCCO's at different banks have the same pin number.

See:
http://direct.xilinx.com/bvdocs/publ...ns/ds001_4.pdf

E.g. XC2S100-TQ144 pin16 or pin53 and many others.

The mistakes are so regularly, that i wonder if i miss anything here...

Thanks for any eye openings.

MIKE

"M.Randelzhofer" <[email protected]> wrote in message
news:[email protected]..
> Hi ng,
>
> i try to understand the Xilinx Spartan2 pinout data sheet.
> Some VCCO's at different banks have the same pin number.
>
> See:
> http://direct.xilinx.com/bvdocs/publ...ns/ds001_4.pdf
>
> E.g. XC2S100-TQ144 pin16 or pin53 and many others.
>
> The mistakes are so regularly, that i wonder if i miss anything here...
>
> Thanks for any eye openings.

I raised this with Xilinx some time ago and was told that it's intentional -
something to do with getting all the packages in the same table. You should
see that for the packages with more pins, they have two pins, one for each
bank. IIRC you use the first of the banks, where they are duplicated for the
same pin. For instance, for the XC2S15 in the VQ100 package, P26 is Vcco for
bank 6, but for the TQ144, P106 is Vcco for bank 6 and P107 is Vcco for bank
5. They really ought to add an explanatory note, as it's rather confusing.

Leon

"M.Randelzhofer" <[email protected]> wrote in message news:<[email protected]>...
> Hi ng,
>
> i try to understand the Xilinx Spartan2 pinout data sheet.
> Some VCCO's at different banks have the same pin number.
>
> See:
> http://direct.xilinx.com/bvdocs/publ...ns/ds001_4.pdf
>
> E.g. XC2S100-TQ144 pin16 or pin53 and many others.
>
> The mistakes are so regularly, that i wonder if i miss anything here...
>
> Thanks for any eye openings.
>
> MIKE

Mike,

They are not mistakes - they just mean that those pins supply power to
both banks. On the larger packages there are enough pins to have more
pins and give better flexibility.

They could do with describing it better but they do mention it in the
document http://www.xilinx.com/bvdocs/publications/ds001_2.pdf on page
36.

kevin

M.Randelzhofer wrote:
> Hi ng,
>
> i try to understand the Xilinx Spartan2 pinout data sheet.
> Some VCCO's at different banks have the same pin number.
>
> See:
> http://direct.xilinx.com/bvdocs/publ...ns/ds001_4.pdf
>
> E.g. XC2S100-TQ144 pin16 or pin53 and many others.
>
> The mistakes are so regularly, that i wonder if i miss anything here...
>
> Thanks for any eye openings.
>
> MIKE
>
>
>
It is just to have the same table for all the package.

Laurent
www.amontec.com

I have asked my friends in Spartan-land to add a sentence at the bottom of
the pin-out table explaining this "pin-economy" trick.
One redundant sentence can save a lot of irritation...
Peter Alfke

Peter Alfke wrote:
> I have asked my friends in Spartan-land to add a sentence at the bottom of
> the pin-out table explaining this "pin-economy" trick.
> One redundant sentence can save a lot of irritation...
> Peter Alfke
>
Thanks Peter

Larry