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acquistare libro on line] 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 5: | Line 5: | ||
[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 | ||
| Line 19: | Line 19: | ||
== 20 Pin JTAG PinOut == | == 20 Pin JTAG PinOut == | ||
| − | 1 | + | 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 | 3 nTRST 4 GND | ||
5 TDI 6 GND | 5 TDI 6 GND | ||
| Line 28: | Line 42: | ||
15 nRST 16 GND | 15 nRST 16 GND | ||
17 -- 18 GND | 17 -- 18 GND | ||
| − | 19 -- 20 GND | + | 19 -- 20 GND |
| + | |||
== external links == | == external links == | ||
| Line 35: | Line 50: | ||
* [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 | ||
| − | * [http://hri.sourceforge.net/tools/jtag_faq_org.html "JTAG FAQ"] by Stas Khirman 2004 | + | * [http://hri.sourceforge.net/tools/jtag_faq_org.html "JTAG FAQ"] by Stas Khirman 2004 |
* [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) | ||
| Line 44: | Line 59: | ||
* [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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