[SI-LIST] Draft (updated) Touchstone 2.0 specification available for review

All,

The IBIS Ad Hoc Interconnect Task Group has completed an updated draft 
Touchstone 2.0 document now being reviewed by the IBIS Open Forum.  The draft 
is provided with the objective of soliciting comments and eventually calling 
for a vote within the Open Forum on whether to issue the draft as a formal 
specification and eventual standardization.

In response to industry comments on an earlier draft, this version adds 
explicit support for free-form mixed-mode network data.  Other features/changes 
from the original Touchstone are:

- specific keywords have been added, similar to IBIS, for Version, Number of 
Frequencies, Number of Ports and other information
- an appendix has been added explaining conversion between single-ended and 
mixed-mode data
- per-port impedances (real only) may be defined
- the upper limit on the number of ports in a file has been removed
- network data may be represented in a compact upper-half or lower-half format 
(similar to RLGC matrices)
- normalization is removed for G-, H-, Y- and Z-parameters
- a placeholder section for additional information has been added; this will 
eventually support port-to-terminal mapping
- the original line-wrapping restrictions have been removed
- 100% backward compatibility is preserved; 1.0 files are still valid under the 
2.0 document

You can find the draft document at the following location:

http://www.eda.org/ibis/docs/touchstone/touchstone2_forum_review_draft_a.pdf

A presentation summarizing the changes is available at:

http://www.eda.org/ibis/docs/touchstone/touchstone2-summary-update-09.pdf

Comments are requested, either over the reflectors or privately.

- Michael Mirmak
  Intel Corp.
  Chair, IBIS Open Forum
  http://www.eigroup.org/ibis/
  http://www.eda.org/ibis/

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