[ibis-macro] Re: clock times
- From: Mike Steinberger <msteinb@xxxxxxxxxx>
- To: scott@xxxxxxxxxxxxx
- Date: Thu, 01 Apr 2010 17:52:52 -0500
Scott-
We've been using your option A.
Mike S.
Scott McMorrow wrote:
All
We are looking at the specification for clock_times and have come
across the following problem with these two sentences:
The clock times are the times at which clock signal at the output
of the clock
| recovery loop crosses the logic threshold. It is to be assumed
that the
| input data signal is sampled at *exactly one half clock period*
after a
| clock time.
I really hate assumptions in specifications since they may be wrong,
and are up to interpretation. I believe that the spec really means to
define the internal sample point of the sampler, slicer, track hold
... whatever, by having the EDA platform move the delivered clock tick
from the clock_times vector by 1/2 a clock period, or UI. If that
interpretation is correct then which of the two is correct?
1/2 a clock period is defined to be:
A) one half of the nominal UI
B) one half of the instantaneous UI between two clock samples
How is this currently being implemented in currently developed models?
regards,
Scott
--
Scott McMorrow
Teraspeed Consulting Group LLC
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(401) 284-1827 Business
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