using JTAG( mixed systems)

jgil · ‎2003-05-29

Posted on May 29, 2003 at 14:07

jgil · ‎2011-05-17

Posted on May 17, 2011 at 11:54

I'm trying to use the JTAG interface with two devices. An device is powered to 5V and the other is powered to 3.3V . How should a mixed voltage JTAG chain be laid out, what should the

device order be, and what should the VCC of the parallel cable be?

Thanks in advance for any comments.

Regards,

Jokin

joseph2399 · ‎2011-05-17

Posted on May 17, 2011 at 11:54

Assume your 3.3V device is 5V tolarent, then you should put your 5V device in the front.