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JTAG Pinout Picture

New MessageJTAG Pinout Picture (modified 0 times) greghol
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People have been asking where the JTAG connections are located. Here is a picture showing what vias to tap into to get to the JTAG interface.
You may have to zoom in with your browser or favorite JPG viewer to see the text.

http://pages.sbcglobal.net/greghol/jb/JB_JTAG.jpg


Greg

06-21-2005 01:32:36

New MessageRE:JTAG Pinout Picture (modified 0 times) greghol
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Jtag info added to Wiki, http://www.elinux.org/wiki/JuiceBoxJTAG?action=show
I guess I can do a bottom shot with labels also.

Greg

06-21-2005 13:09:29

New MessageRE:JTAG Pinout Picture (modified 0 times) Tom61
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Thanks for the pictures. I'm glad you started posting here again. With the info you've given, it'll be alot easier to hack once I get around to hacking it (busy with another project right now).
06-21-2005 17:53:12

New MessageRE:JTAG Pinout Picture (modified 0 times) cole
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The nTRST signal is actually down one pin, I believe. Other connections worked great (passing jtag detect anyhow)...
06-21-2005 18:51:28

New MessageRE:JTAG Pinout Picture (modified 0 times) greghol
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Thanks for catching the error. I double checked the datasheet and I can see that it is going to a 4.7k ohm pull up resistor and via on the other side of the CPU pads. I updated the picture on my site and on the JB Wiki site.

JTAG Users: Connecting nTRST may casuse problems depending on the ARM SoC and the JTAG interface used. It is not realy needed in most aplications. TMS usally gets into the JTAG mode.

Greg

06-21-2005 21:23:12

New MessageRE:JTAG Pinout Picture (modified 0 times) dhbarr
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Greghol, cole: what JTAG header are you guys using? Roll your own?

-dhbarr.

06-22-2005 10:11:02

New MessageRE:JTAG Pinout Picture (modified 0 times) cole
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I am using the Xilinx parallel cable III (DLC5) with the jtag-tools (under Linux) from the openwince project. It registers the CPU properly (it is the only device on the JTAG chain).
06-23-2005 07:53:00

New MessageRE:JTAG Pinout Picture (modified 0 times) greghol
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14 pin 100 mil center headers are real common on ARM based board. I have a EPI Jeeni and Maccraigor JTAG interfaces and they use the same 14 pin connector and pin out. From the www.embeddedperformance.com site.

http://www.embeddedperformance.com/support/jeeni_14pin.txt


Front view of 15-pin JTAG Connector on JEENI
----------------------------------------------------------------
| SPU SRST TDO TCK TMS TDI NTRST SPU |
\ /
\ GND GND GND GND GND GND GND /
\__________________________________________________________/


Red
Stripe
|
| | | | | | | | | | | | | | |
| | | | | | | | | | | | | | |
| | | | | | | | | | | | | | |
| | | | | | | | | | | | | | |
| | | | | | | | | | | | | | |
| | | | | | | | | | | | | | |
+-------------------------------+
| |\
| | \
+-------------------------------+ | <- pin 1
\ \ |
\______________________________\|


+-----------------------------------------+
| 13 11 9 7 5 3 1 |
| SPU TDO TCK TMS TDI NTRST SPU |
| |
| GND SRST GND GND GND GND GND |
| 14 12 10 8 6 4 2 |
+-----------------------------------------+
Top view of 14-bit JTAG header on target

06-23-2005 13:28:49

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