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

["Eric Ellison" <ecellison@comcast.net>]

Ray

I indeed have not forgotten or missed your offer, nor any of your messages
on this subject. 

What a few of us decided on a teamspeak session was pretty basic. It did not
really define what was to go on the buss or buss design. I would say that
what we decided is still open to discussion, and expert recommendation.  

Answer to #1:

We decided to have 4 96 pin connectors on the board in it's basic format.
Connectors spaced to 'fit' standard PC slots and Lbrackets. For folks
wishing to 'extend' the buss beyond 4, they could do so with right angle 96
pin connectors at either end of the board. (I am not sure that we could get
placement with this design to continue to use a PC mounted backplane with
'skipped' slots where boards mate together.) 

The power connector(s) ATX 24-pin, and berg connectors for off board power
leds, would be mounted opposite the 'connector' sides of the daughter cards
which would face the rear of a PC enclosure putting the power connector
centrally located on the internal side of the PC enclosure. (hope that makes
sense (smile, I know I know I need diagrams!)) Also if we need active or
passive termination, on some lines, a SIP socket would be mounted at one or
the other end of the board. Obviously we need to know what lines need
termination, since we can't terminate every line.

Answer to #2

No, no assignments from current board developers, just the pins going to the
buss, with signals assigned. No power assignments etc. 

Thanks
Eric






-----Original Message-----
From: xylo-sdr-bounces@lists.ae5k.us [mailto:xylo-sdr-bounces@lists.ae5k.us]
On Behalf Of Ray Anderson
Sent: Tuesday, February 21, 2006 12:13 PM
To: xylo-sdr@lists.ae5k.us
Cc: Ray Anderson
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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