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Re: [lpc2000] Question: Secondary JTAG internals

2005-02-02 by Robert Adsett

At 09:16 PM 2/1/05 -0500, Milos Prokic wrote:
>I was wondering if anyone has any information regarding the secondary JTAG -
>internal structure. I'm battling a problem that I can only connect to JTAG
>after I've SHORTed the 3.3 V line. My powerup sequence is - first core
>(1.8v) and then IOs (3.3v) (btw there is nothing in the datasheet that
>mentions the sequence, so I presumed it wouldn't matter). Without shorting
>the tool will refuse to connect, but once shorted - works like a charm.


Philips has stated, and my experience has been, that there is not a 
sequencing issue on power up.  I suspect you've got something else going 
on.   I've not used the secondary JTAG myself, but it does appear to cause 
people no end of troubles.

Robert

" 'Freedom' has no meaning of itself.  There are always restrictions,
be they legal, genetic, or physical.  If you don't believe me, try to
chew a radio signal. "

                         Kelvin Throop, III

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