[ibis-macro] Problem with IBIS-AMI clock_times definition
- From: "Muranyi, Arpad" <Arpad_Muranyi@xxxxxxxxxx>
- To: "IBIS-ATM" <ibis-macro@xxxxxxxxxxxxx>
- Date: Tue, 16 Jun 2009 17:28:58 -0700
Hello AMI experts,
We stumbled on an interesting problem with the definition
of the clock_times parameter in the GetWave function. This
is what the spec says:
| Vector to return clock times. The clock times are referenced to the
start
| of the simulation (the first AMI_GetWave call). The time is always
| greater or equal to zero.
The problem is that this variable uses a type double. If
you run a few million bits, it will work, but when we run
hundreds of million bits or more, the double precision number
runs out of decimal digits to give an accurate time resolution
for the clock ticks. This can turn into huge errors in the
eye diagram and related curves.
We would have been better off if we would have defined this
value as a relative number with respect to an ideal clock
tick time, kind of like a error term to be used as a
correction value.
Has anyone ran into this problem yet?
I would suggest to fix the AMI spec, because this seems to
be a fairly serious problem.
Thanks,
Arpad
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