[SI-LIST] Re: JTAG Guru's
- From: "Jim Antonellis" <jim.antonellis@xxxxxxxxxxxxx>
- To: <treyh123@xxxxxxxxx>, "'Si-List'" <si-list@xxxxxxxxxxxxx>
- Date: Tue, 25 Sep 2001 18:14:42 -0400
I hit the send key by mistake.... I was going to
list a few of the other pointers that came up with
a google search on "JTAG & TUTORIAL".... but you
can take it from here.
-
Jim Antonellis jim.antonellis@xxxxxxxxxxxxx
Sandburst Corp www.sandburst.com
(978) 689-1669
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Trey Henderson
Sent: Tuesday, September 25, 2001 5:40 PM
To: Si-List
Subject: [SI-LIST] JTAG Guru's
I am hoping there are a few people in the group that
know JTAG fairly well. I am currently using it now
for flashing in a new design, but I have some
unanswered questions.
The JTAG interface is made up of 5 signals:
TMS : Test Mode Select
TCK : Test Clock
TREST_N : Test Reset
TDI : Test Data IN
TDO : Test Data OUT
These signals go into the TAP (Test Access Port) and
allow me to do boundary scan and somehow give the part
test instructions.
Questions:
1. What happens if I continuously toggle the JTAG
pins when I am not flashing the part (eg, when it is
in 'normal' operation). Will this cause the processor
to freak out? Will it matter for some pins but not
others?
2. I am unsure what the TMS pin does. Do I need to
continuously do something to this pin..or, do I just
hold it low for testing? I've read the the TAP
controller responds to "changing" of the TMS and TCK.
3. After power-up, before I do testing or flashing,
do I need to hold the TRESET_N pin low.
4. Anyone have a short tutorial for JTAG?
Thanks for your help,
-Trey
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