Hirose FX2 Backplane ?

Is there a Hirose FX2 100 pin backplane or cabling available ?

I'd like to connect some Nexys boards together.

Robert

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--- In f..., "Rob Finch" wrote:
>
> Is there a Hirose FX2 100 pin backplane or cabling available ?
>
> I'd like to connect some Nexys boards together.
>
> Robert
>

Digi-Key sell the connectors, that's where I got mine to suit the
Nexys board. Min order quantity was 2 pieces IIRC.

Part No. H4355-ND , or the Hirose part no. FX2BA-100SA-1.27R
This is the connector which uses regular pitch IDE cable.
Would make connecting 2 Nexys boards together possible.

They also have PCB mount connectors aswell. Search Digi-key.

You are no doubt awar that Digilent make FX2-100 based experimenter
boards?

Red

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--- In f..., "Leslie" wrote:

> Part No. H4355-ND , or the Hirose part no. FX2BA-100SA-1.27R
> This is the connector which uses regular pitch IDE cable.
> Would make connecting 2 Nexys boards together possible.
> Red
>
Did you have a chance to check the signal integrity after going
through two connectors and the flat ribbon cable?
Would be interesting.

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--- In f..., "e2kcpu" wrote:
>
> > Part No. H4355-ND , or the Hirose part no. FX2BA-100SA-1.27R
> > This is the connector which uses regular pitch IDE cable.
> > Would make connecting 2 Nexys boards together possible.
> > Red
> >
> Did you have a chance to check the signal integrity after going
> through two connectors and the flat ribbon cable?
> Would be interesting.
>

That's an interesting topic.

I'd expect you would get performance similar to IDE100 signal rates
using that cable. Using every second conductor, while forcing others
to GND would improve things presumably.

I haven't performed any such checking, since my application was
fairly trivial, with the circuitry on the expansion board only using
an fXax in the order of 6MHz.

There was some discussion either here, or elsewhere of people
experiencing problems driving circuitry on the FX2BB experimenter
board with a Nexys I believe?

Red

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--- In f..., "Rob Finch" wrote:
> Is there a Hirose FX2 100 pin backplane or cabling available ?

There "is" cabling available, but good luck getting the connectors in
single quantities :(

Please have a look at :

http://www.hirose.co.jp/cataloge_hp/e57220088.pdf

> I'd like to connect some Nexys boards together.

I was thinking about making a backplane for the FX2, until I noticed
that digilent in their wisdom decided to put this connector in a
different location on every board :(

So, you could use a backplane, but it wouldn't be as nice as a
VME-Chasiss or similar. (Anybody remember those ? ;-))

Cheers

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> That's an interesting topic.
>
> I'd expect you would get performance similar to IDE100 signal rates
> using that cable. Using every second conductor, while forcing others
> to GND would improve things presumably.

That's the way the Hirose is wired - of the 100 pins, 42 are signal
grounds. Actually, there are only 40 IO lines. That's one of the
reasons I stay with the Spartan 3 Starter Board. I get a lot more IO.

> There was some discussion either here, or elsewhere of people
> experiencing problems driving circuitry on the FX2BB experimenter
> board with a Nexys I believe?

I would expect the breadboard to seriously limit the use of high
frequencies. I usually think of them for use in the kHz range.

Richard

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