>>>>> "Matt" == <[EMAIL PROTECTED]> writes:
Matt> Hi All: Has anyone on this list successfully cascaded the JTAG
Matt> ports of an ATMega128 and an Altera device? I'm having trouble
Matt> with it at the moment, and I'm not sure whether the problem is
Matt> with my dodgy hacked-up cascade cable, the software (javr and
Matt> quartus), the particular device not supporting jtag fully (altera
Matt> MAX7k, but actually need to know about altera epc2), or the pinout
Matt> I'm using.
Matt> The normal singly connected way is like this:
Matt> Byteblaster TDO <-> AVR TDO AVR TDI <-> Byteblaster TDI
Matt> And also:
Matt> Byteblaster TDO <-> Altera TDO Altera TDI <-> Byteblaster TDI
Matt> This works, even though my nomenclature may be wrong (it should
Matt> probably be byteblaster TDO <-> AVR TDI etc). Anyway, using the
Matt> same nomenclature, I'm trying an altera byteblaster MV with the
Matt> following connection:
Matt> Byteblaster TDO <-> Altera TDO Altera TDI <-> AVR TDO AVR TDI <->
Matt> Byteblaster TDI
Matt> So, it should work, in theory. However, I get a jtag chain
Matt> incomplete error from both javr and quartus.
Scan the Atmega Data sheet for the erratas at the end. Atmel didn't get it
right for a long time. I don't know if actual chip revisions are fixed now,
the errata is unclear.
Bye
--
Uwe Bonnes [EMAIL PROTECTED]
Institut fuer Kernphysik Schlossgartenstrasse 9 64289 Darmstadt
--------- Tel. 06151 162516 -------- Fax. 06151 164321 ----------
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