From: eLinux.org
JTAG
Joint Test Action Group, referring to IEEE Standard 1149.1: Four-pin
(plus power/ground) interface designed to test connections between
chips. Interface is serial (clocked via the TCK pin). Configuration is
performed by manipulating a state machine one bit at a time (via TMS
pin), then transferring one bit of data in and out per TCK clock (via
TDI and TDO pins, respectively). Different instruction modes can be
loaded to read the chip ID, sample input pins, drive (or float) output
pins, manipulate chip functions, or bypass (pipe TDI to TDO to logically
shorten chains of multiple chips). Operating frequency varies per chip,
but is typically 10-100MHz TCK (10-100ns per bit time). The description
of how JTAG is implemented for a specific device is described in a file
specific to that device called a BSDL file.
Contents
Information
- http://en.wikipedia.org/wiki/JTAG
- http://www.asset-intertech.com/products/free_resources.htm
- various resources
- openjtag wiki
- Common JTAG
Pinouts - Macraigor JSCAN
- Overview of On Chip Debug
Methods - gojtag - needs to be ported to Linux
Tutorial
Embedded Linux JTAG debugging (CELF
presentation)
Hardware (emulators)
- Holly Gates wiggler - Parallel Port
- Cheap Tag 5v only parallel port
- Flyswatter- USB
- ARM DS-5 - DS-5 and DSTREAM provide
embedded Linux developers with a full professional development suite - gnice">gnICE
- USB w/full schematics
- ICEbear JTAG - USB
- JTAG
Blue -
Parallel Port - http://wiki.openwrt.org/JTAG_Cables
- http://hri.sourceforge.net/tools/
- Macraigor compatible wiggler
- http://www.sparkfun.com/shop/index.php?shop=1&cart=201362&cat=74&
- http://www.ocdemon.net/hwproducts.htm
- \$150-\$1800 par,usb,serial,ethernet
- http://www.dlpdesign.com/usb/2232m.shtml
- USB module
- http://www.corelis.com/products/index.htm
- Emulators, Testing and Programming
- http://www.amontec.com/jtagkey.shtml
- USB
- http://www.sparkfun.com/commerce/product_info.php?products_id=7834
- USB
- http://www.ronetix.at/peedi.html
- JTAG/BDM Emulator and Flash Programmer
- http://www.mentor.com/products/embedded_software/majic-jtag-probe/
- JTAG Emulator, Flash Programmer, Hardware Bring-up
- Embest UNetICE - USB
and Ethernet based JTAG Emualtor for ARM7 and ARM9 processors - XDS100v2 - USB JTAG
emulator for TI processor available from
Embest - Dangerous Prototypes Bus
Blaster (~35\$
open hardware)
Tools
- JTAG_Finder
- UsingJtagTools
- http://openwince.sourceforge.net/jtag/
- http://fjtag.sourceforge.net/
- http://jtagtools.sourceforge.net/
- http://www.lart.tudelft.nl/projects/jtag/jflash-linux.tar.gz
- http://lapwww.epfl.ch/dev/arm/jelie/index.php
- http://cvs.arm.linux.org.uk/cgi/viewcvs.cgi/jtag/
- http://jtager.sourceforge.net/
- http://openocd.berlios.de/web/
- http://urjtag.org/
- http://opencollector.org database
contains a list of opensource JTAG SW tools