JTAG with external power source

jtag 74hc244

I am trying to setup an external power source instead of useing the 5 volt supplied from the computer's LPT port. The pinouts are as follows,
TDI TO PIN 4 ON THE DB25
TCK TO PIN 3 ON THE DB25
GND TO PIN 18-25 ON THE DB25
TMS TO PIN 2 ON THE DB25
TDO TO PIN 13 ON THE DB25
TRST TO PIN 5 ON THE DB25

I want to use a regulated 3.3 volt power source. I created 1 using batteries. My reason is to advoid to high of power from the computer and also eliminate anything that could harm the computors motherboard.
If someone could help that would be great.
I'm trying to reprogram a 29LV8008BTC
You can also email me direct @
od@intersat.cc:

74hc244 jtag

Dear mate :

With, which kind of CPU ?

STI55XX or IBMSTB02100:!:

???

samsung 9500 jtag

It's a STI5518

jtag cable 74hc244

The folowing instruction is a sample jtag for sammy9500 and for educational use only:


To programm the flash in Samsung 9500 first of all you need to make a little interface,
which will allow us to connect CPU with the flash inside of the receiver.
JTag adapter has to be made exactly like the scheme and then attach it to the receiver,
just like ilustrated on the below image.

**broken link removed**


Connecting spots are located at the right side just above the two embeded card readers.
On older models there you will find the connector on which you will attach jtag on.
Newer models don't have that connector and that spot is filled with white mass.
In first case JTAG id connected to the connector in the other to the resistors.
It is soldered from the JTAG connector side.
It is equal where you solder it (to resistor or connector),
because there is nothing after them! There are final elements for JTag.
The values of resistors, of whom the JTAG adapter is made,
has to be 150 Ohm and one of 39 Ohm (which is connected to pin 13).
It is yery important that pins 18-25 of LPT cabel connect to the mass,
which is afterwards connected to the mass of the receiver.
When all is connected check the connecting spots one more time and switch-on the reciver on main switch.
While the reciver is in stand-by mode, run the program „Jkejs 1.33“.
If you get all zeroes (like on the image) than there is something wrong
and you don't have the communication between receiver and PC.
In this case try to shorten the cabel to some 40 cm and check again if it is made properly!!!




The right answer from the receiver is the one that you see on the image below.
This means that the communication is properly established and only now you can start to programm the flash.
You can see "Device ID", box keys can contain values or can be empty "FF".



After that go to flash tools...



... and anctivate them...




You will be given the steps which need to be made to attached to the flash, line showed on the picture!
Even if in the manual is written otherwise for Samsung you will need a different approach!
In this moment leave the program jKeys on this explanation, turn-off the receiver on the remote,
than turn-on and in half a second you have to press OK in the jKeys programm.
It is very important that you reaction is fast, it is important to press OK
in previously than the loader in Samsung is activated and the beginning of load s/w starts!




If everything is made OK and the initialisation has succeeded,
jKeys should recognise the type of flash and all his data should be shown (view the image above).
Base Address has not to be modifyed, leave the address as it is 7FE00000.
It is clearly shown that is AMD type of flash, with 2MB of memory.
In this moment on the receiver display „1“, “0“, or even nothing can be shown!
All the cases are OK. Now is necessary to delete the content of flash! Erase Flash (without fear).

Confirm the decision ...

**broken link removed**

jKeys deletes the flash...




When the delete completes, choose the file with the right flash.
Flash dump can be read with the programming device and his size is 2,048 KB.
In this case his name is "dsr9500mcmain.bin". Choose him and press Open.




Writing has began ...





When the writing is over, close jKeys, switch-off the receiver on main switch
(on the display will be the same text as in the beggining of the process) and wait for 20 seconds.
After that period it is necessary to turn on the receiver which performs the boot normally.
If it doesn't switch-on, it is necessary to redo the entire procedure,
if boot is performed turn-off the receiver, remove the JTag adapter and the receiver box can be closed.
Congratulations, you have just patched your first receiver over the JTAG adapter.
I wish you a pleasant viewing of SATV!!!



thanks for Prettyboy.

Added after 31 minutes:

Jtag Buffer Board

jtag на 74hc244

Dear iransatforum
Wow very well explained. I built the jtag cable without the 74HC244. I did use 100Ω
resistors on the DB 25 2 -5 though. I saw that diagram before and was confused on where to connect the VCC to from points 2 - 5 I see it's 3.3v. Can I tie them together into a 3.3 input on the receiver? Also the 1A1 goes to where? I have several diagrams showing this and I can't figure it out. Last is the VCC on the 74HC244 (20)
I thought maybe there would be a way that I could insert a battery which would be regulated through the jtag cable @ 3.3 volt, instead of using the 74HC244.
I want to thank you so much for helping me on this. Your input is greatly appreciated.
Regards

74hc244 jtag schematic diagram

STI 5518 ,J-tag Pins need 3.3v power and for safety,you must use the Buffer IC 74HC244 .

about the power supply of IC, you can use ,x2 of AA size bat.


1A1 :?????

jtag with 74hc244

OK. I think I'm up to speed. I knew about the 3.3 volt power input, but I thought there might be a simpler way to provide it using a external sourse only, but I now see I'll have to use the 74HC244. I'll then connect that to a 3.3 volt battery,but what about the 3 VCC lines that have the 2.2 resistors. Do I tie them together and bring them to the same 3.3 volt source ?
Regards
odod

jtag ibm

you can use the voltage output from LPT port directly for this matter with the attached drawing :

only , you must use the shortest cable connection and several time action for j-tag and use the best earth for this board.

@ No. you can not tie them together !

good luck

schematics 2 card reader in sti5518

Dear iransatforum

I'm going to build using the diagram with the 74HC244 (the 1 in blue). I need to know where the 3 leads from pins 2,3,4,5 (on the DB25) that are marked VCC go (they use the 2.2k resistor) you state I can attach them to the LPT but I'm not sure which pins would be the best. Can you supply me with the right ones?
The JTAG cable length is 20 cm.
I want to thank you again for your patients in this matter. You've been a huge help.
If I can be any assistance to you please feel free to contact me.
Regards

jtag external resistor values

attached files!

ic 74hc244 pic

PCB!

74hc244 for jtag

PCB

arm-jtag 74244

I got it.

This was a huge help.
I should be all set.

Regards and much thanks.

3.3 volts sti5518

My JTAG
I sent picture
You can show

jtag sti pin out

hi i need pcb and schematic jtag for IBM chip
and pin config
please helpme

lpt jtag buffer

tps_star said:

hi i need pcb and schematic jtag for IBM chip
and pin config
please helpme

Click to expand...

If you find it , please advise us too !!!

j tag 5518

Hi iransatforum

I spent some time looking around and saw you in some other forums. I came up with zip as well. There is a schematic of the IC @ the IBM site. Nothing about jtaging it though. Did you ask them @ IBM? **broken link removed**
You need to log in.
I'll look again tonight

Added after 5 minutes:

hoang_csa said:

My JTAG
I sent picture
You can show

Click to expand...

Very well done.
I'm trying to build 1 whiten the head of the DB25. If I can cram it in there I'll post a pic.

jtag 74244

Dear odod:

For talking about STB02100 come to :

samsung 9500 jkeys upute

Dear odod:
You need my PCB JTAG_VN
I have sent for you
you give mail or mail hoang_csa@yahoo.com

attach jtag

hi hoang_csa
please send me pcb your jtag
thancks
my email: amiriran123@yahoo.com