[SI-LIST] PRBS Data Pattern.
- From: "julian, simba" <sjulian@xxxxxxx>
- To: "'si-list@xxxxxxxxxxxxx'" <si-list@xxxxxxxxxxxxx>
- Date: Tue, 12 Oct 2004 09:25:37 -0400
Greetings fellow SI engineers,
For high speed analysis of serial links, my understanding is that you would
want to use a data pattern that would excite and replicate different ISI
effects in simulation. Before lengthening my simulation time, or turning to
mathematical solutions in MATLAB(or similar products), or new techniques
such as Channel Analysis that I'm sure the list is aware of by now, I would
like to know if there are any techniques that you use to define a
channel/topology specific stimulus to exacerbate the majority of these ISI
effects so that the inner and outer most contours of the eye would be
defined even within a relatively short(or reasonable) simulation time.
Specifically if you use 8b/10b encoding there is a limit on the number of 1s
or 0s that your stimulus should have. Outside of that, is there a relation
between channel length to Bit pattern length? Or channel length to max
number of 1s/0s? Or bit width to pattern relationship? How about running a
TDR type simulation on the actual channel.... is there any useful data from
the results as it relates to derivation of an exhaustive data pattern? I
know I'm fishing here but my gut tells me that there must be some type of
methodology or relation that exists instead of just using this "PRBS"
pattern that I have sitting in a file for use in all serial simulation
cases.
Thanks,
Simba
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