hi john,
regarding the recent NRAO memo on word boundry detection
(in your link below):
i think the early ATA engineers tested prototype hardware
that didn't use 8/10 encoding in high speed serial links.
(since the data is noise like, one shouldn't need two
extra bits to insure sufficient transitions and detect word
boundries), but they encountered problems, and abandoned them
in favor of 8/10 encoding.
philosophically, i prefer industry standards,
like 8/10 encoding. one can transmit test patterns or any
data one wants; it's more flexible and upgradable,
and doesn't cost much more - it's sometimes cheaper
to stick with industry standards, especially if one
includes NRE costs. and SERDES's have tricky stuff inside - many
of them don't gaurantee specs if you don't 8/10 encode.
best wishes,
dan
John Ford wrote:
Thought this might be of interest:
New Electronics Division Technical Note
EDTN No. 213
Title: Word-Boundary Detection in a Serialized, Gaussian-Distributed,
White-Noise Data Stream
Authors: Matt Morgan, Rick Fisher
Date: October 13, 2009
http://www.gb.nrao.edu/electronics/edtn/index.html
