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Jtag interface

 
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MicroManiac



Joined: 21 Aug 2008
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Jtag interface
PostPosted: Fri Oct 31, 2008 8:18 am     Reply with quote
Hello,
Has anyone ever simulated JTAG protocol inside a PIC?

Thank you
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PICoHolic



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PostPosted: Fri Nov 07, 2008 5:47 am     Reply with quote
Check this out:

It might help: http://www.jtag.com/en/Learn/Standards/IEEE_1149.1?session=st29lo6mhr6s0fdcqim6r1ist2
MicroManiac



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PostPosted: Fri Nov 07, 2008 6:19 am     Reply with quote
No,
it didn't help Confused
i need something more clear
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FvM



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PostPosted: Fri Nov 07, 2008 8:41 am     Reply with quote
Actually, a lot of JTAG related code is available on the internet. In my understanding, it's not yet clear what simulate JTAG protocol exactly means. It may designate both sides of JTAG communication, the requirements would be rather different, however.
MicroManiac



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PostPosted: Fri Nov 07, 2008 9:00 am     Reply with quote
OK
I am new at the JTAG Protocol.
I want to debug a couple of chips in JTAG Mode but i don't have any clear idea about how JTAG works.
You can say that i want to use the JTAG in Master mode to communicate with the devices.
Thanks in advance
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"Any intelligent fool can make things bigger, more complex, and more violent. It takes a touch of genius -- and a lot of courage -- to move in the opposite direction."
Albert Einstein
FvM



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PostPosted: Fri Nov 07, 2008 11:00 am     Reply with quote
A simple C-language project (originally dedicated to a PC lpt port) is http://www.inaccessnetworks.com/projects/ianjtag. There are also more complex projects at gnu.org.

This Altera application note is also an instructive literature to my opinion:http://www.altera.com/literature/an/an039.pdf
treitmey



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PostPosted: Fri Nov 07, 2008 11:41 am     Reply with quote
http://www.ftdichip.com/Products/FT2232C.htm
http://www.ftdichip.com/Resources/Links.htm
http://focus.ti.com/docs/toolsw/folders/print/scan_educator.html
Quote:
Application Notes Abstract
JTAG Scan Educator - Ver. 2 (Rev. A)
An educational software program for DOS, JTAG Scan Educator, introduces the fundamentals of the IEEE 1149.1 boundary-scan standard, including architecture protocol, and required instruction sets.
Self-paced and menu-driven, it contains both information and animated boundary-scan test simulations.

http://focus.ti.com/docs/apps/catalog/resources/appnoteabstract.jhtml?abstractName=satb002a

Last edited by treitmey on Fri Nov 07, 2008 1:05 pm; edited 1 time in total
MicroManiac



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PostPosted: Fri Nov 07, 2008 12:40 pm     Reply with quote
ok thank you all
i'll try to make the best out of everything you have given me
_________________
"Any intelligent fool can make things bigger, more complex, and more violent. It takes a touch of genius -- and a lot of courage -- to move in the opposite direction."
Albert Einstein
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