PCB for FG456: layers

[Jaromir Kolouch]

I am beginning the design with Spartan-3 in the FG456 package. <BR>
Can anybody give an estimate how many PCB layers are necessary for this package with 6 perimeter I/O rows and GND, VCCINT, VCCO inside? Is it possible to design reliable board for it without buried vias? <p>Any response will be appreciated.

 

[Martin Euredjian]

I believe you need six layers minimum. No need for buried vias as far I as
know.


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"Jaromir Kolouch" &lt;kolouch@cedo.cz&gt; wrote in message
news:ee81d5e.-1@WebX.sUN8CHnE...
I am beginning the design with Spartan-3 in the FG456 package.
Can anybody give an estimate how many PCB layers are necessary for this
package with 6 perimeter I/O rows and GND, VCCINT, VCCO inside? Is it
possible to design reliable board for it without buried vias?
Any response will be appreciated.

 

[Philip Freidin]

On Sun, 11 Jan 2004 10:54:29 -0800, "Jaromir Kolouch" &lt;kolouch@cedo.cz&gt; wrote:

I am beginning the design with Spartan-3 in the FG456 package. &lt;BR
Can anybody give an estimate how many PCB layers are necessary for this package with 6 perimeter I/O rows and GND, VCCINT, VCCO inside? Is it possible to design reliable board for it without buried vias? <p>Any response will be appreciated.

You have posted an article to comp.arch.fpga via the Xilinx
gateway to this news group. Unfortunately, this gateway
mistakenly allows HTML posting, and even turns text
postings into HTML. For all news groups, including
comp.arch.fpga, the format is supposed to be text only.
I have advised Xilinx about this problem, which they have
said they will fix, but no schedule.

This concerns me for 2 reasons. First, many other users of
comp.arch.fpga either can't read your postings, or it is a
pain, and secondly, I maintain the archive of this news
group at www.fpga-faq.com and I have to spend several
hours each month cleaning up the mess that is caused by
HTML posts.

(11/08/2003 www.fpga-faq.com is currently off the air due
to a Denial of Service attack. I expect that it will be
enabled again early next month)

An alternative free system that will allow you to read and
post articles to comp.arch.fpga and that does not have this
problem is the gateway provided by Google, which also
maintains archives (for all news groups) in text form only.
(The archive for this news group at google should have the
same content as the one I maintain, but mine has nicer
indices and threading by author, topic, and date)

You can use google starting from the following page:

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There is a link in the top right corner for posting. You
may have to create an identity before posting, but that is
free too.

Thanks

Philip Freidin


===================
Philip Freidin
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