[hpsdr] R: JTAG Mercury programming problem.

[Gianni Chiodo]

If you are not sure about the correct working of OZY you can use the loop
back HPSDR Test Fixture Cable  ( schematics available at
http://hpsdr.org/support.html loopback cable schematics plus OZY serial
cable schematics ) and follow the instruction same page at Ozymandias USB
interface Ozy/janus production test procedure.
In the past was very useful to me ( probably an ESD discharge damaged some
pin of the OZY FPGA and the Altera weak pull up where connected to some
other pins rising the voltage on PTT and ADC overload on atlas bus stopping
Mercury )
A 2 x 4.7 K to ground applied to PTT and ADC overload allowed me to continue
the usage of the damaged OZY .
After the change of the Cyclone II with a new one the loopback test system
was very useful to verify the correct soldering on the component.

-----Messaggio originale----- 
Da: hpsdr-bounces at lists.hpsdr.org [mailto:hpsdr-bounces at lists.hpsdr.org] Per
conto di Phil Harman
Inviato: giovedì 26 marzo 2009 7.16
A: hpsdr at lists.hpsdr.org
Oggetto: Re: [hpsdr] JTAG Mercury programming problem.

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


Hi Aivars,

Have a look at this diagram and the block diagrams on the Wiki of the 
Ozy and Mercury code.

svn://206.216.146.154/svn/repos_sdr_hpsdr/trunk/Atlas/Mercury to Ozy 
interface.jpg


You should be able to use your 'scope to look for the various clocks on 
the Atlas bus.

I would guess its a bad joint on one of the FPGA pins - good luck!

73's Phil...VK6APH






Quoting Aivars Straupe <yl2gvc at inbox.lv>:

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