On Sat, 2007-06-09 at 10:56 -0400, Herbert Graf wrote:
> > My problem is that some devices (like DSPs) are not using a
> > standard JTAG configuration, so common use of chained jtag loops could
> > bring a lot of problems.
> 
> I'm surprised to hear that, in my limited experience with JTAG (outside
> of the FPGA sphere) while some devices do have "non-standard" commands,
> other devices just ignore them, so it's not usually a problem to chain
> them together.

Rereading you post, are you saying that the PHYSICAL config differs from
standard JTAG with these devices? If so then I don't see it worth your
time doing anything but completely isolating each devices "JTAG" port.

TTYL

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