At 15:58 09-11-07 +0000, you wrote: >On 2007-11-08, Chris Liechti <[email protected]> wrote: >> Grant Edwards schrieb: >>> Can anybody confirm that the JTAG applications work when there >>> are other devices besides the MSP430 in the TJAG chain? >> >> i can't. ;-) > >I had to give up on it. TI's JTAG implementation is >non-compliant but can be made to work (electrically) as long as >it's the first device in the chain. I was able to get various >AVR tools to talk to the the AVR (the second device in the >chain). Somebody who's seen the internals of the TI libraries >assured me that they don't know how to deal with any other >devices in the chain.
<rant mode> I think this is one of the biggest problems with JTAG. It seems it is always the last thing that is implemented in a chip so it is done in a hurry by the lesser gods. I've been bitten badly by JTAG in the past and I even fried some FPGAs through JTAG!. I try to avoid using JTAG as much as I can because in most cases it just doesn't work as expected. I think TI has set another perfect example. </rant mode> Nico Coesel
