JTAG Manufacturer ID

Written by Ian on Monday 22/01/07

If you've read our guides to JTAG technology, you'll know that one of the fields the IEEE thought fit to include in the 1174 standard was a manufacturer ID. This is actually controlled by the JEDEC association, any manufacturer can request an ID number (not sure what happens when they start to run out of numbers), but the latest 26-or so page long list is in this PDF document
These bits line up exactly with the relevant fields in the JTAG ID register - but don't forget they are presented least significant bit first!!