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PICList Thread
'[PIC]: JTAG'
2003\06\03@124419 by Digiled dot com

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Hello piclister,
     Sorry to post this in the list.

     Anyone have an article of JTAG ? Protocol, Hardware interface,
     programs, etc.. ?
     Thanks in advance.
     Gus

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2003\06\03@130623 by Tim Webb

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What is JTAG?

I keep seeing this word somewhere and I keep wondering what it is or stands for.

What is is used for?

{Original Message removed}

2003\06\03@130644 by Picdude

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I googled for this recently and came up with a lot of good info.
Cheers,
-Neil.


On Tuesday 03 June 2003 11:45, Digiled dot com scribbled:
> Hello piclister,
>       Sorry to post this in the list.
>
>       Anyone have an article of JTAG ? Protocol, Hardware interface,
>       programs, etc.. ?
>       Thanks in advance.
>       Gus

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2003\06\03@133238 by Micro Eng

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google search should find a source, but look on Altera's website for a
programmer, etc

serial in, serial out, clock  is about it


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2003\06\03@134439 by hael Rigby-Jones

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> -----Original Message-----
> From: Tim Webb [SMTP:tim_webbspamspam_OUTAGILENT.COM]
> Sent: Tuesday, June 03, 2003 5:58 PM
> To:   @spam@PICLISTKILLspamspamMITVMA.MIT.EDU
> Subject:      Re: [PIC]: JTAG
>
> What is JTAG?
>
> I keep seeing this word somewhere and I keep wondering what it is or
> stands for.
>
> What is is used for?
>
JTAG =  Joint Test Action Group.  It is a defined five pin hardware and
serial communication protocol to primarily allow JTAG equipped complex IC's
to be daisy chained together and functionaly tested in circuit.  It is also
used as a programming protocol for some devices.

Regards

Mike


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2003\06\04@123510 by Tim Webb

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Thanks Mike,

Sounds interesting, would you happen to know where I could see a simple example of a JTAG circuit application or any part numbers of IC's using JTAG so that I can look up the data sheet.

Thanks,

Tim

{Original Message removed}

2003\06\04@154436 by Barry Gershenfeld

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>Sounds interesting, would you happen to know where I could see a simple
example of a JTAG circuit application or any part numbers of IC's using JTAG
so that I can look up the data sheet.
>Thanks,
>Tim

>JTAG =  Joint Test Action Group.  It is a defined five pin hardware and
>serial communication protocol to primarily allow JTAG equipped complex IC's
>to be daisy chained together and functionaly tested in circuit.  It is also
>used as a programming protocol for some devices.
>Regards
>Mike

JTAG is a lot like SPI. In fact, it has the same reset-clock-data-in/out
connections.  The one I saw ran at 10 MHz.  There may be some kind
of command/data protocol but I think most of the protocol
is specific to the JTAG hardware inside each processor.

It can be used to read out the state of each pin, some or all
registers, and anything else the manufacturer/designer saw
fit to connect it to.  Likewise you can write to these things
to pre set them.  The way JTAG can load a program is by using
memory write cycles to place a program in memory...usually a
loader program.

ARM processors have it.  So did the Pentium II (but not the AMD).
Probably later Pentium chips but I don't know.

Barry

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2003\06\04@163649 by gtyler

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Your satalite decoder will most probably have one too, although they are
taking them out now for security issues.

gtyler
{Original Message removed}

2003\06\06@182206 by Micro Eng

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Altera 7xxx series use JTAG and JAM


>From: Tim Webb <spamBeGonetim_webbspamBeGonespamAGILENT.COM>
>Reply-To: pic microcontroller discussion list <TakeThisOuTPICLISTEraseMEspamspam_OUTMITVMA.MIT.EDU>
>To: RemoveMEPICLISTspamTakeThisOuTMITVMA.MIT.EDU
>Subject: Re: [PIC]: JTAG
>Date: Wed, 4 Jun 2003 10:33:55 -0600
>
>Thanks Mike,
>
>Sounds interesting, would you happen to know where I could see a simple
>example of a JTAG circuit application or any part numbers of IC's using
>JTAG so that I can look up the data sheet.
>
>Thanks,
>
>Tim
>
>{Original Message removed}

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