Re: [Xylo-SDR] FPGA board

[KD5NWA <kd5nwa@cox.net>]

What does the Eurocard standard calls for? I've looked up a lot of boards
lately and the schematic labels them 1-96

At 09:11 AM 1/16/2006, you wrote:
> We need to decide on the
> function of all 96 pins on the DIN41612
> connector soon before you finalize your design.
>
> A suggestion: The pins are normally numbered A1-A32, B1-B32, and
> C1-C32.  A1, B1, and C1 start on the same side of the connector.
> Using pin numbering of 1-96 will cause more confusion.
>
> Phil N8VB
>
> On 1/16/06, Leon Heller <leon.heller@bulldoghome.com> wrote:
> > I've just ordered some FAN1112 1.2V regulators direct from
> Fairchild. Mouser
> > seemed to have a problem with my credit card (I probably got the
> number
> > wrong) so I've cancelled that order. My Fairchild distributor had
> them, but
> > only if I wanted to buy a reel of 2,500! 1.2V regulators are
> somewhat
> > difficult to find, probably because the output voltage is lower than
> the
> > reference supply used on most regulators.
> >
> > I've got some triple output switching regulator samples from TI that
> are
> > made specifically for FPGAs, but they are a lot harder to use.
> >
> > I've also ordered a couple of the SRAMs from Farnell.
> >
> > I've made the PCB 100 mm x 100 mm, and changed all the Rs and Cs to
> 0603.
> >
> > On the DIN41612 connector I'm using pins 1, 33 and 65 for Gnd and
> pins 32,
> > 64 and 96 for 5V. It's a four-layer board with a ground plane and
> supply
> > voltage plane for VccIO (3.3V). I'll use a copper pour area for
> VccINT
> > (1.2V).
> >
> > 73, Leon
> > --
> > Leon Heller, G1HSM
> > leon.heller@bulldoghome.com
> >
>
> http://www.geocities.com/leon_heller
> >
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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 ...