[hpsdr] [OZY] Schematic Update May 18, 2006 - REVXA.5

[Christopher T. Day]

Phil,

My apologies, I confused myself again. I forgot that there are _two_
JTAG busses on Ozy, one from the header that only goes to the local
Cyclone II, and another on the Atlas bus that goes to some GP I/O pins
of the Cyclone II and then to JTAG segments on daughter boards. [BTW,
does the chain close if there is an unpopulated socket on Atlas? Or is
there a jumper to close the chain on the last Atlas board?] To use the
second one from USB, FX2 should be in Port mode, and the Cyclone II
needs a configuration file loaded that hooks up some of the FX2 Port
pins through the Cyclone II to the Atlas JTAG bus. Then the FX2 can run
the Atlas JTAG bus to access everything except the local Ozy JTAG; the
Local Ozy Cyclone II has several other means of being programmed through
the FX2. Yes, we did work through this before and I forgot. If I keep
writing it down like this, maybe at some point I'll get it fixed in my
head. Sorry to distract you.


	Chris - AE6VK


-----Original Message-----
From: Philip Covington [mailto:p.covington at gmail.com] 
Sent: Friday, May 19, 2006 4:22 PM
To: Christopher T. Day
Cc: HPSDR List
Subject: Re: [hpsdr] [OZY] Schematic Update May 18, 2006 - REVXA.5

Chris,

The JTAG chain on the Atlas bus does connect to the FPGA... therefore
we can program the JTAG chain on the Atlas bus over USB.  The Cyclone
II FPGA on OZY is configured by the FX2 over USB, Active or Passive
Serial, it's JTAG pins, and/or the configuration device.  The
configuration device can be programmed by an external programmer or
the FX2 also.  I don't see where the problem is?

73 de Phil N8VB




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