Difference between revisions of "JTAG"

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m (Reverted edits by 86.55.198.176 (Talk); changed back to last version by DavidCary)
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[http://hangzhau.cn/html/benq-dc/ benq dc 1300] [http://nibko.info/data/patenta-d.htm patenta d] [http://puli.org.cn/web/video-scaricabili/ video scaricabili] [http://hangzhau.cn/html/honda-italia/ honda italia importatore] [http://italnet.net.cn/img/zoom-sigma/ zoom sigma canon] [http://puli.org.cn/web/residence-napoli/ residence napoli] [http://puli.org.cn/web/cosmetico-naturale/ cosmetico naturale] [http://nibko.info/data/lunikoff.htm lunikoff] [http://nibko.info/data/instint.htm instint] [http://nibko.info/data/betrayed-.htm betrayed - tradita] [http://zodip.info/description/air-max.htm air max keyeh] [http://hangzhau.cn/html/bmw-x/ bmw x5 emilia romagna] [http://italnet.net.cn/img/albergo-reggio/ albergo reggio calabria] [http://zodip.info/description/berlusconi-pat.htm berlusconi pat] [http://puli.org.cn/web/spiderman/ spiderman 2] [http://hangzhau.cn/html/residence-ambassador/ residence ambassador] The Joint Test Action Group (JTAG) standardized a 5 pin boundary-scan test port as IEEE Std. 1149.1, "Standard Test Access Port and Boundary-Scan Architecture".
+
The Joint Test Action Group (JTAG) standardized a 5 pin boundary-scan test port as IEEE Std. 1149.1, "Standard Test Access Port and Boundary-Scan Architecture".
  
 
While originally intended for boundary-scan testing of PCB assemblies, to replace bed-of-nails testing, the JTAG port included in many popular microprocessors is also often used for programming and debugging.
 
While originally intended for boundary-scan testing of PCB assemblies, to replace bed-of-nails testing, the JTAG port included in many popular microprocessors is also often used for programming and debugging.
Line 33: Line 33:
 
     19  User 1  20  Vcc
 
     19  User 1  20  Vcc
  
     1 3.3 V    2 3.3 V
+
     1 +3.3 V    2 +3.3 V
 
     3 nTRST    4 GND
 
     3 nTRST    4 GND
 
     5 TDI      6 GND
 
     5 TDI      6 GND

Revision as of 17:12, 4 September 2007

The Joint Test Action Group (JTAG) standardized a 5 pin boundary-scan test port as IEEE Std. 1149.1, "Standard Test Access Port and Boundary-Scan Architecture".

While originally intended for boundary-scan testing of PCB assemblies, to replace bed-of-nails testing, the JTAG port included in many popular microprocessors is also often used for programming and debugging.

"If you have information on how to connect a JTAG probe to a Nokia phone, please let me know."

There are five pins:

  • TCK/clock
  • TMS/mode select
  • TDI/data in
  • TDO/data out
  • TRST/reset (optional), when driven low, resets the internal state machine.

Except for TCK, all other JTAG lines should be pulled high via a resistor.


WARNING: unconfirmed pinout. Please add links to pinout standard.

20 Pin JTAG PinOut

Which one of these is right?

   Pin Function Pin Function
   1   TRST     2   GND
   3   TDO      4   GND
   5   TDI      6   GND
   7   TMS      8   GND
   9   TCK     10   GND
   11  VPP_E   12   GND
   13  A/W     14   GND
   15  User 0  16   GND
   17  Rdy/Bsy 18   GND
   19  User 1  20   Vcc
    1 +3.3 V    2 +3.3 V
    3 nTRST     4 GND
    5 TDI       6 GND
    7 TMS       8 GND
    9 TCK      10 GND
   11  --      12 GND
   13 TDO      14 GND
   15 nRST     16 GND
   17  --      18 GND
   19  --      20 GND 


external links