Re: [Xylo-SDR] Eurocard Cyclone II PCB

[Philip Covington <p.covington@gmail.com>]

I think that by not putting any active components on the motherboard,
we won't restrict the different uses it can be put to.  For example, I
am more interested in a LTC2208 based board than I am in a QSD based
one right now.  The 24.576 Mhz oscillator is specfic to the audio ADCs
or CODECs (though it could be populated with a oscillator of a
different frequency).

73 de Phil N8VB



On 1/8/06, Eric Ellison <ecellison@comcast.net> 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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