I'm working on my first project with JTAG. I managed to use onTap to find
some problems between a PowerPC and flash memory today. That was great!
Anyway, there is concern that if we make one big JTAG loop, it will not
work if there is anything wrong anywhere on the loop. I'm thinking we
could stick resistors between the serial data out of one chip and the
serial data in of the next, then put a single JTAG header for the whole
board and also headers for each chip. When driving an individual chip, the
serial data out of the previous chip would be "overpowered" by the JTAG
"probe" serial data out.

Is this workable? Is anyone doing anything like this? What value resistor?

THANKS!

Harold


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