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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 ... "