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Old 06-17-2013, 05:58   #4 (permalink)
Jacques2
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Join Date: May 2012
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Easy JTAG Finder Question

I am attempting to locate the pinout on an LG MS910. I was able to get Easy JTAG to identify the pins in Stage 1, but when looking for TRST in Stage 2, it identified Pin 2 as TRST, which was identified as TCK during Stage 1.

Here is the log:
Start Z3X Jtag Pin Finder...
Successefuly connected to box on COM39
Waiting for box reset...
Box S/N: 00000000BXXXX (it's valid)
Box Working Mode: JTAG Pin Finder.
Start Z3X Jtag Pin Finder...
Stage 1: Search TCK / TMS / TDI / TDO...
Get IDCODE...
JTAG Pinout Found: TCK: Pin 2 / TMS: Pin 7 / TDI: Pin 8 / TDO: Pin 6
CPU IDCODE : 0x27B360E1 Mfg.: 0x070, Part: 0x7b36, Ver.: 0x2
CPU Manufacturer: QUALCOMM , CPU Name: MSM8255 Scorpion Rev 2.0
Stage 2: Search TRST...
TRST Pin Found: TRST: Pin 2
Box S/N: 00000000BXXXX (it's valid), ,FW Ver.: 01.44
Box Working Mode: JTAG Box.

So is pin 2 TCK or TRST? if TCK, how do I find TRST. If pin 2 is TRST, how do I find TCK?

During this test, BAT. and NRST WERE NOT connected to the Easy-JTAG box. Pin 20 was set to GND.

Suggestions?
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