What Is Jtag?-joint Test Action Group-fag - Page 3 - GSM-Forum

De Fault · 03-18-2010, 04:32

Well, I used to use Wiggler JTAG with OCD Flash Programmer software way back in the years 2004 - 2006. At that time most of the Wiggler interface schematics available on the Web were not correct so I lost much time to build those devices but none of them appeared to work unfortunately.

Then I purchased Banyan-U ARM debugger interface from China (from Mr. Jason) and used it for 5 years as a debugger and flash memory programmer tool.

This is really a great product, I enjoyed using it very much.

I also used DigiView logic analyzer to debug JTAG communications between the target board and the JTAG interface.

It cost me nearly $400.- including the shipping cost. It is working perfectly but now Mr. Jason is no longer updating this excellent product any more. So it has become a bit outdated and I had no choice other than migrating to J-Link.

J-Link is an excellent product I believe, however the new JLink.EXE version 4.12 is not without some bugs. If you feel that something is wrong you have to restart this program and continue your work

De Fault · 03-18-2010, 04:51

We can debug JTAG communications between the target board and the JTAG interface with the help of a logic analyzer. I am using DigiView logic analyzer.

king_of_rajasthan · 01-22-2011, 10:49

If you can't find the jtag pinouts for your phone model,you have to find it by yourself.It is also easy,not difficult.
For example:
We know a CPU whose jtag pinouts are like as below.
AA14 - NTRST
P11 - TMS
Y13 - TCK
N11 - RTCK
AD19 - RST_n
AC16 - TDI
Y14 - TDO
OK,you can desolder the CPU from the phone board firstly.Then look for where its AA14,P11,Y13,N11,AD19,AC16,Y14 are connected to by multimeter.You will get the right jtag pinouts for this model in this way.When you find it,you can solder the CPU back to the phone board.

king_of_rajasthan · 01-22-2011, 10:52

Quote:

Originally Posted by king_of_rajasthan

dear thanks for reply but the most important thing is " i dont wanna buy jtagfinder "

i wanna kno the way by which the jtag finder is working

i wanna know how to calculate by multi-meter

& here is the way ...........

If you can't find the jtag pinouts for your phone model,you have to find it by yourself.It is also easy,not difficult.
For example:
We know a CPU whose jtag pinouts are like as below.
AA14 - NTRST
P11 - TMS
Y13 - TCK
N11 - RTCK
AD19 - RST_n
AC16 - TDI
Y14 - TDO
OK,you can desolder the CPU from the phone board firstly.Then look for where its AA14,P11,Y13,N11,AD19,AC16,Y14 are connected to by multimeter.You will get the right jtag pinouts for this model in this way.When you find it,you can solder the CPU back to the phone board.

ngocpt · 01-22-2011, 11:33

Does someone know which is the good software for J-link to deal with Qualcomm series ( internal and external memory) except PSAS (QMAT)?

I ask for that coz I'm working with MSM6290 but PSAS does not support that kind of CPU.

Thanks in advance.

dr_moosavi · 02-15-2011, 11:52

Points/Wires Basic Info

Points/Wires info

Name

Function

Connections

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 (IEEE 1149.1) 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.

dr_moosavi · 02-15-2011, 11:55

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

Source : Master Manual in support area!

My question is Can you tell me if something you do not understand , or will that be better if i make PS_HOLD connections with pictures ?

VREF is Voltage displayed top of the software shows some voltage values .

aikonmani · 03-11-2011, 22:18

What DCC is....
Digital Command Control ...... READ MORE.....FROM HERE...

DCC Tutorial (Basic System) - DCCWiki

::gsmcoder:: · 05-20-2011, 19:40

very good post, currently fighting to get jtag inputs for iphone baseband processor

king_of_rajasthan · 05-22-2011, 07:59

Quote:

Originally Posted by gsmxpert

very good post, currently fighting to get jtag inputs for iphone baseband processor

which cpu is in that phone
please post detail

rogerboogie · 10-31-2011, 08:47

Quote:

Originally Posted by king_of_rajasthan

which cpu is in that phone
please post detail

here are some info

a4 cpu inside iphone 4

Apple A4 - Wikipedia, the free encyclopedia

a5 cpu inside iphone 4s & ipad 2

Apple A5 - Wikipedia, the free encyclopedia

also for iphone 4 baseband processor

XMM 6180 - The iPhone Wiki

and iphone 4s baseband processor

MDM6610 - The iPhone Wiki

hope this can help to develop jtag solution

nost · 10-11-2012, 16:18

well, another side of the coin, at less in mobile phones are bootloader, dumps and firmwares. teams make work for technicians so easy (i have ort jtag), but do you know tutos about how can we make our full flash, firms and boot-loaders?

mardi · 11-24-2012, 02:45

need help,maybe some one have blackberry firmware dump from jtag,i need it

thanks

psytr0nic · 12-04-2012, 03:25

topic have no to stop .
luck ORT and RIFF come to make things easy for us now .

dicle_gsm · 02-16-2013, 20:39

good info thanks bro ..

02-15-2011, 11:52	#36 (permalink)
dr_moosavi Product Supporter Join Date: Jul 2008 Location: iran-shiraz Posts: 730 Member: 814775 Status: Offline Sonork: 100.1587334 Thanks Meter: 973	Points/Wires Basic Info Points/Wires Basic Info Points/Wires info Name Function Connections 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 (IEEE 1149.1) 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.

02-15-2011, 11:55	#37 (permalink)
dr_moosavi Product Supporter Join Date: Jul 2008 Location: iran-shiraz Posts: 730 Member: 814775 Status: Offline Sonork: 100.1587334 Thanks Meter: 973	What is PS_HOLD ? 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 Source : Master Manual in support area! My question is Can you tell me if something you do not understand , or will that be better if i make PS_HOLD connections with pictures ? VREF is Voltage displayed top of the software shows some voltage values .

03-11-2011, 22:18	#38 (permalink)
aikonmani No Life Poster Join Date: Jul 2006 Location: INDIA,TAMILNADU,PATTUKKOTTAI Posts: 1,082 Member: 304090 Status: Offline Thanks Meter: 210	What DCC is What DCC is.... Digital Command Control ...... READ MORE.....FROM HERE... DCC Tutorial (Basic System) - DCCWiki

10-11-2012, 16:18	#42 (permalink)
nost Freak Poster Join Date: Nov 2005 Location: Colombia Age: 48 Posts: 392 Member: 197360 Status: Offline Thanks Meter: 25	boot, dump and firmware well, another side of the coin, at less in mobile phones are bootloader, dumps and firmwares. teams make work for technicians so easy (i have ort jtag), but do you know tutos about how can we make our full flash, firms and boot-loaders?

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01-22-2011, 10:49	#33 (permalink)
king_of_rajasthan No Life Poster Join Date: Feb 2006 Location: Rajasthan Age: 41 Posts: 563 Member: 227647 Status: Offline Sonork: 100.1603662 Thanks Meter: 311	If you can't find the jtag pinouts for your phone model,you have to find it by yourself.It is also easy,not difficult. For example: We know a CPU whose jtag pinouts are like as below. AA14 - NTRST P11 - TMS Y13 - TCK N11 - RTCK AD19 - RST_n AC16 - TDI Y14 - TDO OK,you can desolder the CPU from the phone board firstly.Then look for where its AA14,P11,Y13,N11,AD19,AC16,Y14 are connected to by multimeter.You will get the right jtag pinouts for this model in this way.When you find it,you can solder the CPU back to the phone board.

01-22-2011, 11:33	#35 (permalink)
ngocpt Junior Member Join Date: Dec 2004 Age: 40 Posts: 39 Member: 101829 Status: Offline Thanks Meter: 0	Does someone know which is the good software for J-link to deal with Qualcomm series ( internal and external memory) except PSAS (QMAT)? I ask for that coz I'm working with MSM6290 but PSAS does not support that kind of CPU. Thanks in advance.

05-20-2011, 19:40	#39 (permalink)
::gsmcoder:: Cheater -Don't Deal with him- Join Date: Aug 2005 Location: /%%temp%%.;adb Posts: 3,652 Member: 172434 Status: Offline Sonork: 100.161280 Thanks Meter: 577	very good post, currently fighting to get jtag inputs for iphone baseband processor

11-24-2012, 02:45	#43 (permalink)
mardi Freak Poster Join Date: Jan 2001 Location: Jakarta,DKI,indonesia Posts: 485 Member: 3179 Status: Offline Thanks Meter: 142	need help,maybe some one have blackberry firmware dump from jtag,i need it thanks

12-04-2012, 03:25	#44 (permalink)
psytr0nic No Life Poster Join Date: Oct 2010 Location: Abidjan Age: 38 Posts: 2,478 Member: 1418143 Status: Offline Thanks Meter: 353	topic have no to stop . luck ORT and RIFF come to make things easy for us now .

02-16-2013, 20:39	#45 (permalink)
dicle_gsm No Life Poster Join Date: Jul 2007 Location: tr Posts: 2,219 Member: 539148 Status: Offline Thanks Meter: 2,174	good info thanks bro ..