always ran +bus on one side the common down the middle and the -bus one pin
in for swapping the board at the wrong end for end to keep from burning out
something maybe this will help with the power busses.
tom w0kgw
----- Original Message -----
From: "KD5NWA" <kd5nwa@cox.net>
To: "Xylo-SDR Discussion" <xylo-sdr@lists.ae5k.us>
Sent: Sunday, January 08, 2006 11:48 AM
Subject: Re: [Xylo-SDR] Eurocard Cyclone II PCB
>I would recommend the power traces be on the outside edges of the
> connector specially the ground so on boards that are two layers the
> traces can be much wider than three pins.
>
> At 08:32 AM 1/8/2006, you wrote:
>>Leon
>>
>>Great! You might want to poll the group of how many and which pins to make
>>intra board and how many and which to make I/O from the FPGA. I guess the
>>power traces should be doubled along the edge. I'll leave that up to you
>>guys.
>>
>>Eric
>>
>>
>>-----Original Message-----
>>From: xylo-sdr-bounces@lists.ae5k.us
>>[mailto:xylo-sdr-bounces@lists.ae5k.us]
>>On Behalf Of Leon Heller
>>Sent: Sunday, January 08, 2006 2:03 AM
>>To: Xylo-SDR Discussion
>>Subject: [Xylo-SDR] Eurocard Cyclone II PCB
>>
>>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.
>>
>>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 ... "
>
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>
>
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