Re: Atmel At91Eb55 with chameleon pod

"werswissenwill" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
> Hi
>
> I was wondering if there is anyone with
> an working connection between a chameleon POD ( amontec )
> and an at91eb55 board from atmel.
> I can program the POD but neither in Raven nor in Wiggler "mode"
> connects to my target.
> ( OCD commander and multi2000V3.6 don´t work )
> Thing is, there is a jumper ( cb15 ) on the board which let´s choose
> between "ice" and "jtag". the thing was hardwired to "ice", I cut the
> wire and soldered it to "jtag". A dude from atmel told me to do so.
> Was this a good idea anyway ?
>
>
> Thanks in advance
>
> Martin B
>
As mentioned in a previous mail, the AT91M55800 CPU clock is initially
generated from the 32 kHz slow clock.
The JTAG intereface is synchronized with the CPU using the this clock and
the max JTAG speed should be
CPU clock/ 4 or so.
This means that the JTAG should not be run faster than 8 kHz.
At that rate, you need to run a script in the debugger that programs the PLL
to the high speed 33 MHz clock.
Once it is running there, you program the on board flash with something that
sets the PLL correctly.

For future debugging sessions, you make sure that the CPU can initialize
itself including the PLL
by waiting for a short while before taking control, and then the CPU should
work at 33 MHz and You
can run the JTAG at 8 MHz.

-- 
Best Regards
Ulf at atmel dot com
These comments are intended to be my own opinion and they
may, or may not be shared by my employer, Atmel Sweden.