[ibis-macro] Re: clock_times .... yet again
- From: Mike Steinberger <msteinb@xxxxxxxxxx>
- To: vladimir_dmitriev-zdorov@xxxxxxxxxx
- Date: Wed, 14 Apr 2010 12:35:25 -0500
Vladimir-
If you want to worry about missing or duplicated data, you might want to
consider the case of an odd/even receiver architecture. As you well
know, the IBIS AMI API is based on the assumption that there is a single
data path, and yet we routinely and successfully use IBIS AMI to model
receivers that have two or four data paths. In such cases, the waveform
in each data interval is the waveform at the decision circuit whose
decision is actually going to be used for that data bit. Thus, the
receiver model output waveform and the resulting eye diagram is built up
from segments of waveform that come from different parts of the circuit
altogether.
This all reproduces measured data quite well, so long as the switch in
waveform segments always occurs at the edge of the eye.
Mike S.
Dmitriev-Zdorov, Vladimir wrote:
But here is a minor technical problem: if you do this way, and the
clock times are not equidistant, then some portions of the waveform in
your histogram are counted twice and some could be missing. This is
another Pandora box: what’s a definition of an eye histogram built
from waveform and non-equidistant clock times?
Vladimir
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