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Re: [Xylo-SDR] New head of steam (Eric Ellison)
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.
----- Original Message -----
From: "Ray Anderson" <firstname.lastname@example.org>
Cc: "Ray Anderson" <email@example.com>
Sent: Wednesday, February 22, 2006 1:12 AM
Subject: Re: [Xylo-SDR] New head of steam (Eric Ellison)
The Atlas is the glue piece, which make these and future projects with
FPGA heart really 'run'. Since we have decided to build this buss card
scratch, how should we proceed? We have decided that it will be powered
an ATX power supply with a 24 pin (we have the connector). We have
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
Layers. (Compromise in cost)
I'm really dying on the Atlas otherwise. How do we get from A to B with
current project boards and their needs? What information do we need to
design the Atlas? What tools do we need?
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
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
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