Re: [Xylo-SDR] Backplane stuff... Need input...

["Leon Heller" <leon.heller@bulldoghome.com>]

----- Original Message ----- 
From: "Philip Covington" <p.covington@gmail.com>
To: "Xylo-SDR Discussion" <xylo-sdr@lists.ae5k.us>
Sent: Thursday, February 23, 2006 8:12 PM
Subject: [Xylo-SDR] Backplane stuff... Need input...


> Hi all,
>
> I have been playing around with a Vero protoboard and six 96 pin
> DIN41612 connectors this afternoon.  Here is what I came up with.
>
> For a board without provisions for card guides:
>
> 3.94" W x 5.75" L    6 slots with 0.800" spacing
>
> For a board with card guides (such as Bivar which are 0.600" wide):
>
> 5.00" W x 5.75" L   6 slots with 0.800 spacing
>
> Both are allowing for room on the ends for the ATX power supply style
> connector and some LEDs.
>
> Question:
>
> Do we want/need card guides?
>
> Pro:  Card guides will lock the boards in place.
>
> Con: By using card guides we restrict access to the side edges of the
> plug-in 3U100 boards.  We would only have clear access to the top
> edge.  There would also have to be a keep out area on the 3U100
> plug-in boards to accommodate the rail slots in the card guides.
>
> I am leaning towards recommending that we do not use card guides.
> They are nice for longer boards, but for our 3U100 form factor I don't
> think we need them.

My old FPGA system that used 100 mm x 80 mm cards was quite rigid with two 
cards plugged together.

Leon 

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