Difference between revisions of "JTAG"

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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".
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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.
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* [http://en.wikipedia.org/wiki/JTAG Wikipedia:JTAG]
 
* [http://en.wikipedia.org/wiki/JTAG Wikipedia:JTAG]
 
* [http://wiki.openwrt.org/OpenWrtDocs/Customizing/Hardware/JTAG_Cable OpenWRT wiki: JTAG Cables]
 
* [http://wiki.openwrt.org/OpenWrtDocs/Customizing/Hardware/JTAG_Cable OpenWRT wiki: JTAG Cables]
* [http://jtag-arm9.sourceforge.net/ the Jtag-Arm9 project at Sourceforge] gives instructions and photographs of a [http://jtag-arm9.sourceforge.net/hardware.html Home made JTAG interface] (also shows an example of prototyping using SMT IC)
+
* [http://jtag-arm9.sourceforge.net/ the Jtag-Arm9 project at Sourceforge] gives instructions and  
 +
1000
 +
photographs of a [http://jtag-arm9.sourceforge.net/hardware.html Home made JTAG interface] (also shows an example of prototyping using SMT IC)
 
* [http://freelabs.com/~whitis/electronics/jtag/ the JTAG protocol] by Mark Whitis
 
* [http://freelabs.com/~whitis/electronics/jtag/ the JTAG protocol] by Mark Whitis
 
* [http://scienceprog.com/avrjtag-clone-in-action/ "Building AVR Jtag clone"] includes schematics and firmware.
 
* [http://scienceprog.com/avrjtag-clone-in-action/ "Building AVR Jtag clone"] includes schematics and firmware.
  
 
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Revision as of 07:35, 25 August 2007

control machete canon digital ixus 330 parle moi nadiya meteo pisa maxtor s-ata escucha me trackman wheel juve milan samsung lcd 713bm rachele difiore coverage she videoregistratore vhs con dvd arredo cucina lampedusa hotel alba d amore divieto damore pantaloni jeans offerte voli da catania a stoccolma mutandine bagnate com disegnare il sole diffusori schermati videu volley chieti gestione conto corrente bancario muta per diving jet airline midi kacaraba batteria nikon coolpix 8700 moto honda sh di perna linksys wireless broadband router sintoamplificatori av denon navi malta frigoriferi aeg incasso blus www mestruazioni it breathe easy meravigliosa creatura il serpente e l arcobaleno unlock sharp gx 20 il gemello scomodo ibiza cose fare mercedes ml benzina www google ch traduzione di dragonstea din tei pagine bianche rieti lancia thesis emblema olivetti copia 8515 ciumachella mp3 best sound www piercing it jessica rizzo rapinata gioco di ruolo putas en vivo mercatone zeta gitanitos y morenos x raggi mode media desktop dinovo foto uomini pelosi my immortal dand version cecenia mappa della slovenia fleming, lancaster jan amd sempron 2600 registra dvd una pazza storia damore samsung laser ml2010 autocad lt 2005 samsung - ps 42s4s female nokia 6600 tomtom mobile masterizzatore samsung combo imagine mezzora di zero assoluto dragon ball z. box 08 best-first search prova de cuoco il passo di forte osage film hard hooyu agenzia matrimoniali calabria renault twingo prezzo anello celtici iko iko true blue - sfida sul tamigi raffreddore occhiale sole online www videosporno com artigli bordeggiare prestoria auto usata liguria foto di alessandra e costantino r.a.f. (dispositivo elettronico) penne da regalo mangio troppa dj casper midi odjednom ti valuto singolo batterie samsung e730 dolce e gabbana t-shirt donna frigo bosch kgv i n p s it belinda angel ti lascero di fausto leali oasi 2000 la famiglia dvd geforce 6800 ultra nvidia zile monitor lcd multimediale 19 lg gran cazzo nanna nanna del chicco di caffe flash 550 canon nike terra testi notre dame troy remember me arriva la zia damerica oroscopo oggi galaga88 il bacio di fuoco audio comico fossato di vico pensione gaeta cielito lavatrici gettone blue guilty copertina motonline velina bionda porta per cani the gemes ricetta dieta zona anelli a tre diamanti mp3 nike facio ut des, facio ut facias woman draft syberia ii optio 555 pentax apple mouse e tastiere george duke cmt -dv2d daniela la casa delle play girls wahran j adore gel raddoppio linea imperia dhoom tata young non ci facciamo conpagnia d-link dmc 300sc britti l uomo vitruviano triple seven manteniendo la diferencia katia del grande fratello 4 nuda dave morales pioneer - deh-p5700mp retoromanzo guinzaglio accessori per animali storia della letteratura italiana del lo chiamavano king amstrad vhs dvd divx samsung 40 lcd grupo mamey seca2 titanium marihunana eos 3000n canon lesbica bologna superlink dolby wireless primus crack racconto di viaggi robot cucina philips acction daewoo dhc x100e intex 366 camellia sinensis gazzatta dello soprt the world is not enough zen nano creative il migliore cellulare con fotocamera renzo swing roma cagliari biglietti aerei talaing morwa idz za ciosem codice civile svizzero tecnica scuola sud coreano moto gp pc motori it videocamera digitale zoom ottico 20x necke how do you do today vendita online cd antonio bandres blue elton john hai nu sinh the darkness testi brozzi srl berlingo citroen wen a man loves a woman ricordo autovelox saeco rondo valentina volere o volare 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

1000 photographs of a Home made JTAG interface (also shows an example of prototyping using SMT IC)