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All about JTAG

Vikram

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WHAT'S JTAG ?

JTAG is an interface that you can make urself or buy which allow you to erase and reprogram ur receiver's flash rom.Why using JTag?In case of ur receiver become unusable bcoz. of upgrading with wrong software or if you upgrade with wrong method or power off when upgrading.Meanwhile u need a special software to alive ur receiver again.That's JTag.

JKEYS

jKeys is a program primarily used to access memory on IRDs. It works by utlizing processor diagnostic devices via the JTAG port. This software has been used on STMicroelectronics STiXXXX (ST20 based core) and LSI SC2000 processors.

FLASH ROM

Your receiver flash rom can be erase and program again and again many time like a CD RW.Uploading wrong firmware into your receiver will not damage your flash rom but only render your receiver useless.If you happen to load the wrong file into your receiver you can use Jtag to reprogram ur flash rom.
If Jtag can read your flash rom , box keys then the flash rom has no problem.It's more safer to use Jtag than to use Null modem cable to upgrade your receiver.


HOW TO BUILT A SIMPLE JTAG CABLE

1.25 Pin Male header (Printer Cable)
2. 4 pieces of 100 ohm resistor
3. 1 piece of 33 ohm resistor
4. 6 pieces of wire (longest 12 inches or as short as possible)

PIN ASSIGNMENT


25 Pin <-------> Receiver
Cable

Pin 2 <-------> Pin 9
Pin 3 <-------> Pin 11
Pin 4 <-------> Pin 13
Pin 5 <-------> Pin 19
Pin 13 <-------> Pin 15
Pin 18 to 25 <-------> Pin 20



How To use


1.Power off ur receiver.(remove all connection cable)

2.Connect JTag connector to PC parallel port and receiver.Power up ur receiver.

3.Run Jkeys and clcik on "detect".It'll show "Device ID" and Device on dialogbox.
(if not show "Device ID" and "Device",ur connection will be wrong and u can't erase or program ur flash).

4.Select IRD model and then click "Flash Programming".Don't heed any warning.

5.Click "Read" button and save this file in ur PC.Remember keep it on save place and this DOC file is ur receiver's memory.

.

it Is Very dangerous if U Don't Know About JTAG.It Can Completely Destroy Ur Stb If U Do Little Mistake While JTAG'ING.





image upload on 8 jun 2012
 

sky

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4 pieces of 100 ohm resistor
1 piece of 33 ohm resistor
where to add all resistors
please post detail s
 

sky

Contributor
Joined
31 May 2011
Messages
344
Reaction score
300
4 pieces of 100 ohm resistor
1 piece of 33 ohm resistor
where to add all resistors
please post detail s [hr]
Vikram said:
WHAT'S JTAG ?

JTAG is an interface that you can make urself or buy which allow you to erase and reprogram ur receiver's flash rom.Why using JTag?In case of ur receiver become unusable bcoz. of upgrading with wrong software or if you upgrade with wrong method or power off when upgrading.Meanwhile u need a special software to alive ur receiver again.That's JTag.

JKEYS

jKeys is a program primarily used to access memory on IRDs. It works by utlizing processor diagnostic devices via the JTAG port. This software has been used on STMicroelectronics STiXXXX (ST20 based core) and LSI SC2000 processors.

FLASH ROM

Your receiver flash rom can be erase and program again and again many time like a CD RW.Uploading wrong firmware into your receiver will not damage your flash rom but only render your receiver useless.If you happen to load the wrong file into your receiver you can use Jtag to reprogram ur flash rom.
If Jtag can read your flash rom , box keys then the flash rom has no problem.It's more safer to use Jtag than to use Null modem cable to upgrade your receiver.


HOW TO BUILT A SIMPLE JTAG CABLE

1.25 Pin Male header (Printer Cable)
2. 4 pieces of 100 ohm resistor
3. 1 piece of 33 ohm resistor
4. 6 pieces of wire (longest 12 inches or as short as possible)

PIN ASSIGNMENT


25 Pin <-------> Receiver
Cable

Pin 2 <-------> Pin 9
Pin 3 <-------> Pin 11
Pin 4 <-------> Pin 13
Pin 5 <-------> Pin 19
Pin 13 <-------> Pin 15
Pin 18 to 25 <-------> Pin 20



How To use


1.Power off ur receiver.(remove all connection cable)

2.Connect JTag connector to PC parallel port and receiver.Power up ur receiver.

3.Run Jkeys and clcik on "detect".It'll show "Device ID" and Device on dialogbox.
(if not show "Device ID" and "Device",ur connection will be wrong and u can't erase or program ur flash).

4.Select IRD model and then click "Flash Programming".Don't heed any warning.

5.Click "Read" button and save this file in ur PC.Remember keep it on save place and this DOC file is ur receiver's memory.

.

it Is Very dangerous if U Don't Know About JTAG.It Can Completely Destroy Ur Stb If U Do Little Mistake While JTAG'ING.
4 pieces of 100 ohm resistor
1 piece of 33 ohm resistor
where to add all resistors
please post detail s
 
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