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10-29-2011, 17:45 | #1 (permalink) |
Product Supporter Join Date: Jul 2010 Location: MobilesFactory,trichy,TN,India Age: 33
Posts: 1,523
Member: 1347585 Status: Offline Sonork: 100.1596390 Thanks Meter: 467 | Basic knowlage about GPG-ORT JTAG is a debug interface which is used for debug purpose.GPG-ORT can halt and control the CPU by JTAG.So GPG-ORT can read write the flash by controlling the CPU. There these JTAG signals(Vref,TRST,TDI,TMS,TCK,RTCK,TDO,SRST,GND) which are used during the JTAG operation. RTCK,TRST,SRST are optional for some specific CPUs. Vref,TDI,TMS,TCK,TDO,GND are necessary for any CPUs. VCC Power - Supplies VCC (5 V, 10 mA, typically) to the cable. To target system VCC GND Ground - Supplies ground reference to the cable. To target system ground TCK Test Clock - Drives the test logic for all devices on a JTAG chain. Connect to system TCK pin. TDO Test Data Output - data from the target system is read at this pin. Connect to system TDO pin. TDI Test Data Input - this signal is used to transmit serial test instructions and data. Connect to system TDI pin. TMS Test Mode Select - this signal is decoded by the JTAG state machine to control test operations. Connect to system TMS pin. Note TRST is an optional pin in the JTAG specification, and is not used by XC9500 CPLDs. If any of your non-Xilinx parts have a TRST pin, the pin should be connected to VCC. What is PS_HOLD ? The idea is If you can’t keep phone powered on PS_HOLD will do it for you PS_HOLD is a Test Point that designed to keep cpu powered up while supplying a battery power . Some Power Management IC’s are not able to hold dead handsets powered up and it affects operating while JTAGGing them that’s why they have PS_HOLD Points It is required to make PS_HOLD Connection if it is exist on the pcb just to make sure everything will be stable while you are repairing the phone There is another way to keep the phone up is : Keep pressing the power button ! How to use : Dead Qualcomm handsets sometimes require PS_HOLD Connection on the board and purpose of this powering up the phone’s cpu by force Basic connection is connecting PS_HOLD to VBAT with a resistor . What is the Value of resistor that you should use : Since VBAT Source differs on different phones which average is 3.6V to 4.2V we should use something between 1K and 4.7K Best regards GPG-ORT TEAM |
The Following 3 Users Say Thank You to rajeshchiyyan For This Useful Post: |
10-31-2011, 10:49 | #3 (permalink) |
Insane Poster Join Date: Oct 2011 Location: Shenzhen
Posts: 74
Member: 1670730 Status: Offline Thanks Meter: 8 | Jtag t-mod Little add to Jtag operations. T-MOD MSM6000 have tmode connection which allows jtag to connect cpu in order tmode pin on pcb short to gnd then your jtag shows cpu id otherwise it shows 00000000 id JTAG |
10-31-2011, 10:55 | #4 (permalink) | |
Insane Poster Join Date: Oct 2011 Location: Shenzhen
Posts: 74
Member: 1670730 Status: Offline Thanks Meter: 8 | Quote:
GPGORT support more then his list if you have ORT then its for sure you have solution in hand , try it if you are running a customer service. You will recover those dead phones which are not listed in supported phones. JTAG | |
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