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Re: [Xylo-SDR] Eurocard Cyclone II PCB

I would agree to keep the motherboard as a passive device.
On the issue of the clock to the motherboard, I would put two pads with .1" spacing that could have a jumper, but by default are open. Keep the jumper close to the clock source, a 24.7 MHz or 50 MHz clock running through the board or motherboard could generate a lot of RFI. 

At 02:56 PM 1/8/2006, Eric Ellison wrote:

Phil

MOVED AND SECONDED!

Vote?

Eric


-----Original Message-----
From: xylo-sdr-bounces@lists.ae5k.us [mailto:xylo-sdr-bounces@lists.ae5k.us]
On Behalf Of Philip Covington
Sent: Sunday, January 08, 2006 3:45 PM
To: Xylo-SDR Discussion
Subject: Re: [Xylo-SDR] Eurocard Cyclone II PCB

On 1/8/06, Leon Heller <leon.heller@bulldoghome.com> wrote:
> I'll do it!
>
> I'll order some of the 96-way connectors and a couple of FX2 chips
tomorrow,
> so I can check the footprints. I've already got the Cyclone II chips, but
I
> need to get some of the configuration chips, as well.
>
> I've got the 96-way straight and right-angle connectors in the Pulsonix
> library.
>
> I'll use a four-layer board. There is no point in cutting corners and
it'll
> be much easier to design, as well as cutting down on emissions. As most of
> the connections will be to the DIN connector, I'll save a lot of time by
> using the autorouter on them. I might as well put a 24.576 Mhz oscillator
on
> the board, feeding one of the FPGA clock inputs and brought out to the
> connector, to save having one on the ADC board, as well as a 50 MHz
> oscillator. I've had my Flex board running at 125 MHz, so we could got a
lot
> faster.

Maybe the clocks should stay on the individual boards instead of
putting them on the motherboard?  They can always be routed to other
boards if needed.  It would be nice to make the motherboard all
passive components.

Phil N8VB
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Cecil Bayona
KD5NWA
www.qrpradio.com
"I fail to see why doing the same thing over and over and getting the same results every time is insanity: I've almost proved it isn't; only a few more tests now and I'm sure results will differ this time ... "