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| − | The Joint Test Action Group (JTAG) standardized a 5 | + | 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. | ||
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[http://hogyros.de/?q=node/167 "If you have information on how to connect a JTAG probe to a Nokia phone, please let me know."] | [http://hogyros.de/?q=node/167 "If you have information on how to connect a JTAG probe to a Nokia phone, please let me know."] | ||
| − | There are five | + | There are five pins: |
* TCK/clock | * TCK/clock | ||
* TMS/mode select | * TMS/mode select | ||
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== 20 Pin JTAG PinOut == | == 20 Pin JTAG PinOut == | ||
| − | + | 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 | + | 11 VPP_E 12 GND |
| − | 13 | + | 13 A/W 14 GND |
| − | 15 | + | 15 User 0 16 GND |
| − | 17 | + | 17 Rdy/Bsy 18 GND |
| − | 19 | + | 19 User 1 20 Vcc |
== external links == | == external links == | ||
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* [http://www.arm.com/support/faqdev/1336.html "When designing development boards what style JTAG connector should I use?"] The 20-pin JTAG connector. | * [http://www.arm.com/support/faqdev/1336.html "When designing development boards what style JTAG connector should I use?"] The 20-pin JTAG connector. | ||
* [http://www.embedded.com/story/OEG20021028S0049 "Introduction to JTAG"] by Rob Oshana 2002 | * [http://www.embedded.com/story/OEG20021028S0049 "Introduction to JTAG"] by Rob Oshana 2002 | ||
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* [http://k9spud.com/jtag/ a parallel port JTAG Debugger circuit for Philips LPC2xxx ARM microcontrollers.] by K9JTAG (uses Schmitt trigger inverters, so it can connect 3.0 V target boards to a standard 5.0 V parallel port) | * [http://k9spud.com/jtag/ a parallel port JTAG Debugger circuit for Philips LPC2xxx ARM microcontrollers.] by K9JTAG (uses Schmitt trigger inverters, so it can connect 3.0 V target boards to a standard 5.0 V parallel port) | ||
* [http://diygadget.com/store/building-simple-jtag-cable/info_12.html parallel port JTAG "Building Simple JTAG Cable"] (resistors only) | * [http://diygadget.com/store/building-simple-jtag-cable/info_12.html parallel port JTAG "Building Simple JTAG Cable"] (resistors only) | ||
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* [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 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 | ||
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