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  #1 (permalink)  
Old 11-08-2005, 01:01 AM
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Default looking for FPGA pin header board

Strange request but I'm looking for an fpga board that pretty much only
has an fpga (perferably xilinx because i've only worked with xilinx so
far) a prom and just a whole lot of i/o pins that are easily
accessible.

I've done all i can on my protoboard (digilent spartan 3 board) and now
i need to move to a more finished device. Problem is designing such an
intricate pcb (espically with bga) for someone who hasn't done bga
stuff before but requires many i/o pins and have never done a board
more than 2 layers is leaving me a little challenged. So I'm hoping a
small board that will give me most of the I/O's in headers would be
available, but as of yet I haven't found any.

Does any know any that exsists?

Thank you
Keith Wakeham

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  #2 (permalink)  
Old 11-08-2005, 01:43 AM
Hal Murray
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Default Re: looking for FPGA pin header board

>Strange request but I'm looking for an fpga board that pretty much only
>has an fpga (perferably xilinx because i've only worked with xilinx so
>far) a prom and just a whole lot of i/o pins that are easily
>accessible.


You probably want some ground pins in there too.

Is the Spartan 3 big enough for your needs? It's got quite
a few I/O pins available. If you need more pins, can you
do some pin sharing with external logic? Either a multiplexor
for input signals, or a bank of registers with clock enables
for output signals.

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  #3 (permalink)  
Old 11-08-2005, 04:23 AM
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Default Re: looking for FPGA pin header board

Do you mean you need a development board? I am using Memec-Insight
board with Spartan-3 and it has a 160 connector. There are probably 140
pins available for i/o.

Robert.

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  #4 (permalink)  
Old 11-08-2005, 08:02 PM
busonerd
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Default Re: looking for FPGA pin header board

Keith,

I've just done two different boards with a bga each, and they are my
first boards that are greater than single layer . There are a lot of
electrical advantages that you lose if you go to a pin header design.

Honestly, BGA's aren't as hard as everyone thinks they are. Just follow
the recommendations for footprint layout in the datasheet, and use a
manufacturer with 5/5/10 tolerances. I've pinned out well designed
BGA's [~256 pins] on two layers that way [didn't fab that one,
impedances didn't match up], and less well designed BGA's on 4-6
layers.

Get a professional fab house to mount the BGAs for your prototype,
usually costs us ~50 Canadian for bake + mount [on bare boards].

You'll also probably need gold immersion, depending on what the people
who mount your BGA's want.

--David Carne

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  #5 (permalink)  
Old 11-08-2005, 09:34 PM
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Default Re: looking for FPGA pin header board

Thanks for the info

Looking more and more like going to have to use a custom pcb anyway.
The code were using is small so a spartan 3 is ideal but it just needs
so many I/O's (just the way it has to work with the other components)

Hopefully I'll be able to get something worked out

Keith Wakeham

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  #6 (permalink)  
Old 11-09-2005, 06:05 AM
Simon Peacock
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Default Re: looking for FPGA pin header board

If you let us know what CAD system you are using... there might be a foot
print about that's already getting produced.
I've been using Spartan 2e 150 and Spartan 3 200 / 1000 in ft256 and fg360
respectively.

The Spartan 2 footprint is tried and true for Protel 99SE.. all you need to
do is to add the optional outer 2 rows of vias (it uses pre-routes)

The Spartan 3 is based upon the Spartan 2 version and boards are expected
next month.

Simon


<[email protected]> wrote in message
news:[email protected] oups.com...
> Thanks for the info
>
> Looking more and more like going to have to use a custom pcb anyway.
> The code were using is small so a spartan 3 is ideal but it just needs
> so many I/O's (just the way it has to work with the other components)
>
> Hopefully I'll be able to get something worked out
>
> Keith Wakeham
>



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  #7 (permalink)  
Old 11-09-2005, 05:16 PM
Dave Pollum
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Default Re: looking for FPGA pin header board

[email protected] wrote:
> Strange request but I'm looking for an fpga board that pretty much only
> has an fpga (perferably xilinx because i've only worked with xilinx so
> far) a prom and just a whole lot of i/o pins that are easily
> accessible.
>
> I've done all i can on my protoboard (digilent spartan 3 board) and now
> i need to move to a more finished device. Problem is designing such an
> intricate pcb (espically with bga) for someone who hasn't done bga
> stuff before but requires many i/o pins and have never done a board
> more than 2 layers is leaving me a little challenged. So I'm hoping a
> small board that will give me most of the I/O's in headers would be
> available, but as of yet I haven't found any.
>
> Does any know any that exsists?
>
> Thank you
> Keith Wakeham


You may want to take a look at the BurchEd B5-X300, which uses a
Spartan-IIE (300K gates), and has lots of headers. It's US$226. The
web site doesn't show dimensions for the board, so I don't know how big
it is. (http://www.burched.biz/b5x300.html)

-Dave Pollum

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  #8 (permalink)  
Old 11-09-2005, 08:37 PM
Uwe Bonnes
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Default Re: looking for FPGA pin header board

[email protected] wrote:
> Strange request but I'm looking for an fpga board that pretty much only
> has an fpga (perferably xilinx because i've only worked with xilinx so
> far) a prom and just a whole lot of i/o pins that are easily
> accessible.


> I've done all i can on my protoboard (digilent spartan 3 board) and now
> i need to move to a more finished device. Problem is designing such an
> intricate pcb (espically with bga) for someone who hasn't done bga
> stuff before but requires many i/o pins and have never done a board
> more than 2 layers is leaving me a little challenged. So I'm hoping a
> small board that will give me most of the I/O's in headers would be
> available, but as of yet I haven't found any.


> Does any know any that exsists?


Not exactly pin headers, but the zefants are worth a look:
http://www.zefant.de/en/index.php

--
Uwe Bonnes [email protected]

Institut fuer Kernphysik Schlossgartenstrasse 9 64289 Darmstadt
--------- Tel. 06151 162516 -------- Fax. 06151 164321 ----------
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