[hpsdr] Ozy Design

[Bill Tracey]

I believe you can drop a 2C5 in w/o problem - you probably have to 
redo the RBF files, but electrically at the pins I believe they're 
compatible.   I think we used the 2C5 on the Ozy 1 and the 2C8 on the 
production ... we wanted to make sure we had the largest FPGA 
practical to allow room for experimentation.

The  DS2480B  is not currently used by any software  ... it probably 
does not work as currently wired since it's powered from the 3.3v bus 
and it wants 5v.  At one point I did try to talk to it and was unable 
to get it to work - probably because the supply voltage for it is 
wrong.  The intent was to put 1 wire EEPROMs on the various boards on 
the bus and we'd be able to enumerate what was on the bus -- good 
idea, but flawed in the implementation.

Regards,

Bill (kd5tfd)


At 04:48 AM 8/14/2008, you wrote:
>***** High Performance Software Defined Radio Discussion List *****
>
>I have two questions on the design of Ozy:
>
>1. The FPGA in the schematic is EP2C5 while it is EP2C8 in the BOM.
>As the larger memory of the EP2C8 is not really used (at least with the
>actual firmware) an EP2C5 would be conveniant. Is it fully compatible in the
>current design?
>
>2. There is a DS2480B on the board which is not used by the current software
>as far as I could see.
>What was the intention to implement this rather complex and expensive 1-wire
>chip?
>
>Gerd, DJ8AY



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