[hpsdr] Universal synth bus and stuff

[hughes3hns at aol.com]

Are 10MHz (or whatever reference signal is being used) or 1PPS one of 
the predefined Atlas Bus signals or are those to be routed directly to 
each board via external connectors.
I don't see any reference labels which corresponded to those signals 
unless they are  labelled differently

Peter Hughes
N7BMG

-----Original Message-----
From: Lyle Johnson <kk7p at wavecable.com>
To: Naylor Jonathan <naylorjs at yahoo.com>
Cc: hpsdr at hpsdr.org
Sent: Tue, 30 May 2006 07:41:58 -0700
Subject: Re: [hpsdr] Universal synth bus and stuff

  ***** High Performance Software Defined Radio Discussion List *****

 >> Also we are looking to be compatible with HPSDR at the socket
 >> level so we can interchange hardware, but unless someone
 >> defines a pin standard soon, we will have to go our own way.

> A PDF document describing ATLAS and the but definitions is available 
at
(http://www.hamsdr.com/dnld.aspx?id=217) and some additional 
information at
(http://www.needles.de/pics/Atlas_Bus_Def.pdf)

After looking at this document, are there any specific signals that 
your
project requires that are not already defined or suggested?  If so,
having a list of them might result in some further suggested uses of
backplane signals.

***

Regarding an abstraction layer for standardizing your RF control 
signals...

You might want to consider making this an SPI interface.  Most
microcontrollers have at least one SPI interface, and if you choose to
use one with two SPI interfaces as well as one I2C interface, you 
should
be able to handle almost anything.  Or, you might make it an I2C
interface if you can obtain a microcontroller with two I2C and one SPI
interface on it.  However, SPI can typically be clocked much faster 
than
I2C.  I am not sure if this capability would directly translate into
benefits or greater flexibility for your projects.


73,

Lyle KK7P

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