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'[PIC]: JTAG'
2003\06\03@124419
by
Digiled dot com
2003\06\03@130623
by
Tim Webb
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
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
2003\06\03@134439
by
hael Rigby-Jones
|
> -----Original Message-----
> From: Tim Webb [SMTP:tim_webb
spam_OUTAGILENT.COM]
> Sent: Tuesday, June 03, 2003 5:58 PM
> To: @spam@PICLISTKILLspam
MITVMA.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
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
>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
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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