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Re: [Xylo-SDR] New head of steam (Eric Ellison)

Hi Ray,
Bill and I are very close to a functional Janus breadboard. The latest block diagram is on hamsdr and I'm working on the preliminary circuit diagram at the moment.
Apart from the Lionheart board there is the Mercury high speed A/D that Phil N8VB is working on and Lyle mentioned that he was interested in a DSP board so that an associated PC was not needed. I also have a set of hamband band pass filters and preamp that will go on a Board plus a low lever PA and LPF's. There may also be some news shortly on an alternative to the QSD. Seems like 4 slots is going to be a bit light?
Leon has defined the 5v and 0v pins he will use on the DIN connector (he does not need +12v) but I only know the signals for the Janus and have not selected pins at yet.
One thing that Bill and I discussed was to put a header on the Janus board that would enable a ribbon cable to attach it to a Xylo or Saxo board. That may not be any use above 48k sampling due to limitations in the FPGA on these boards but should be considered now that Leon is not going directly to Lionheart but a two stage development. 

I will post the preliminary Janus circuit shortly.

73's Phil....VK6APH
----- Original Message ----- From: "Ray Anderson" <ray.anderson@xilinx.com> 
To: <xylo-sdr@lists.ae5k.us>
Cc: "Ray Anderson" <ray.anderson@xilinx.com>
Sent: Wednesday, February 22, 2006 1:12 AM
Subject: Re: [Xylo-SDR] New head of steam (Eric Ellison)





Eric wrote:



The Atlas is the glue piece, which make these and future projects with

an

FPGA heart really 'run'. Since we have decided to build this buss card

from

scratch, how should we proceed? We have decided that it will be powered

by

an ATX power supply with a 24 pin (we have the connector). We have

decided

the general 100 mm form factor. We have decided 4 slots, which can be
expanded at either end with right angle 96 pin connectors. We decided

on 4

Layers. (Compromise in cost)





I'm really dying on the Atlas otherwise. How do we get from A to B with

the

current project boards and their needs? What information do we need to
design the Atlas? What tools do we need?




Eric-

As I mentioned some time ago (though it may have gotten lost in the
dying listserver issues), I'm willing to help out on the Atlas design
from a PCB and SI perspective.

A couple of real basic questions:

1) Will there only be slots on the backplane for the boards
currently under consideration (Janus, Lionheart) or is it envisioned to
also provide one or more extract slots for connecting other boards yet
to be envisioned? This impacts the decision on how to terminate the LVDS
signals.

2) Has an overall system diagram been put together yet? I'll need
to browse the SVN site this evening (the firewall here at work isn't SVN
friendly...)


-Ray   WB6TPU




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