SJTAG

SJTAG Newsletter
http://www.sjtag.org

Issue 13 - Spring 2010

You are receiving this email because you are a valued contact of the SJTAG Working Group. If you no longer wish to receive this newsletter, or would like to change your mailing preferences, then please use the links at the bottom of the newsletter.

Any comments on this newsletter can be mailed to admin@sjtag.org.

From the Chair

In our last newsletter we told you that we would be looking at the system architecture aspects for our White Paper. Those of you who may have been monitoring our Wiki pages will probably have noted that there has been no change to White Paper so far: However this does not mean that we have not made substantial progress.

In fact, we have been developing the subject in the form of a tutorial presentation slide set which we have been gradually building up during our weekly meetings. We believe that the format we have just now, while still incomplete, not only helps to introduce the novice to the issues of applying JTAG to the system level but also helps to explain why many of the commercial solutions behave the way they do.

The following are some examples of some elemental building block primitives we have been discovering in the SJTAG problem space. They help us describe the various elements involved with interacting with data registers inside devices that may be buried under multiple levels of hierarchy.

buf.png pbuf.png gbuf.png isw.png osw.png dist.png sync.png

Basic Primitives


tbe.png

Compound Primitive - TAP Bypass Element

Converting this presentation format into a more formal written form for the wiki/White Paper is not trivial and is a task we are just about to commence.

http://wiki.sjtag.org/index.php?title=Volume_3


2009 Survey

We completed the initial analysis of the survey during early March, which means it took us a lot longer than we had originally anticipated. Interpretation of the results had been quite difficult as many of the responses we had were seemingly contradictory and required us to look very closely at the patterns of responses to properly understand the apparent contradictions

The net result is that we haven't had time to format up the results in readily digestable way that we could present on our website. That is still our intent, but it will need a while longer before we can have this ready for you. For now, here a few snippets that we've extracted as a taster:

q3-9.png

There's no arguing with this result: Universal agreement that re-use is desireable. But we do wonder if all the implications that go with this are fully appreciated by all the respondents.



q5-8.png
q5-9.png

It was interesting to see a high correlation between board level and system level requirements to access device instrumentation. We had thought this might swing one way or the other but weren't too sure which way.



q6-2.png

This one seems to have people a bit confused, so it seems that we need to do a bit more work to explain what we mean by "interfaces" and "layers".


http://www.sjtag.org/misc/survey2009.html


Next Newsletter

The Summer edition of this newsletter will be published towards the end of August 2010. Copies of past newsletters are always available on the SJTAG website.

http://www.sjtag.org/newsletters.html


News from the website

A selection of recent RSS/ATOM news items from the website:

Meeting Minutes from May 17th (Issued: Sat, 29 May 2010 20:00:00 GMT)

The minutes from the weekly meeting held on May 17th, 2010 have now been published. Featured discussions: a. White Paper Volume 3 Review - Discussion of sample system diagram (continuation).

URL: http://www.sjtag.org/minutes/minutes100517.html


Meeting Minutes from May 10th (Issued: Sat, 29 May 2010 20:00:00 GMT)

The minutes from the weekly meeting held on May 10th, 2010 have now been published. Featured discussions: a. White Paper Volume 3 Review - Discussion of sample system diagram (continuation).

URL: http://www.sjtag.org/minutes/minutes100510.html


Meeting Minutes from May 3rd (Issued: Mon, 10 May 2010 18:00:00 GMT)

The minutes from the weekly meeting held on May 3rd, 2010 have now been published. Featured discussions: a. White Paper Volume 3 Review - Discussion of sample system diagram (continuation).

URL: http://www.sjtag.org/minutes/minutes100503.html


Meeting Minutes from April 26th (Issued: Mon, 03 May 2010 20:17:00 GMT)

The minutes from the weekly meeting held on April 26th, 2010 have now been published. Featured discussions: a. White Paper Volume 3 Review - Discussion of sample system diagram (continuation).

URL: http://www.sjtag.org/minutes/minutes100426.html


Meeting Minutes from April 19th (Issued: Mon, 26 Apr 2010 22:21:00 GMT)

The minutes from the weekly meeting held on April 19th, 2010 have now been published. Featured discussions: a. White Paper Volume 3 Review - Discussion of sample system diagram (continuation).

URL: http://www.sjtag.org/minutes/minutes100419.html


Meeting Minutes from April 12th (Issued: Mon, 12 Apr 2010 22:11:00 GMT)

The minutes from the weekly meeting held on April 12th, 2010 have now been published. Featured discussions: a. White Paper Volume 3 Review - Discussion of sample system diagram (continuation).

URL: http://www.sjtag.org/minutes/minutes100412.html


Meeting Minutes from March 22nd (Issued: Mon, 12 Apr 2010 22:11:00 GMT)

The minutes from the weekly meeting held on March 22nd, 2010 have now been published. Featured discussions: a. White Paper Volume 3 Review - Discussion of sample system diagram.

URL: http://www.sjtag.org/minutes/minutes100322.html


Meeting Minutes from March 29th (Issued: Mon, 12 Apr 2010 22:11:00 GMT)

The minutes from the weekly meeting held on March 29th, 2010 have now been published. Featured discussions: a. White Paper Volume 3 Review - Discussion of sample system diagram (continuation).

URL: http://www.sjtag.org/minutes/minutes100329.html


Meeting Minutes from March 15th (Issued: Mon, 22 Mar 2010 18:50:00 GMT)

The minutes from the weekly meeting held on March 15th, 2010 have now been published. Featured discussions: a. Hot Topics for White Paper Volume 3.

URL: http://www.sjtag.org/minutes/minutes100315.html


Meeting Minutes from March 8th (Issued: Mon, 15 Mar 2010 18:45:00 GMT)

The minutes from the weekly meeting held on March 8th, 2010 have now been published. Featured discussions: a. Review of Survey Results, b. Hot Topics for White Paper Volume 3.

URL: http://www.sjtag.org/minutes/minutes100308.html


Meeting Minutes from March 1st (Issued: Mon, 08 Mar 2010 18:40:00 GMT)

The minutes from the weekly meeting held on March 1st, 2010 have now been published. Featured discussions: a. Review of Survey Results, b. Hot Topics for White Paper Volume 3.

URL: http://www.sjtag.org/minutes/minutes100301.html


Meeting Minutes from February 22nd (Issued: Mon, 01 Mar 2010 18:45:00 GMT)

The minutes from the weekly meeting held on February 22nd, 2010 have now been published. Featured discussions: a. Winter Newsletter, b. Review of Survey Results.

URL: http://www.sjtag.org/minutes/minutes100222.html