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[http://erlinetor.we.bs/text/tapered-end-mills.html tapered end mills] 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. |
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| | 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 02:14, 11 January 2008
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
