[ibis-macro] Re: Usage type of jitter parameters in ibis5.1
- From: "Muranyi, Arpad" <Arpad_Muranyi@xxxxxxxxxx>
- To: 'IBIS-ATM' <ibis-macro@xxxxxxxxxxxxx>
- Date: Mon, 8 Jul 2013 16:56:05 +0000
Bob,
We can certainly discuss this tomorrow if needed.
But, as far as I remember, the problem with Usage Out parameters
is that both the AMI_Init and the AMI_GetWave functions have an
argument "AMI_parameters_out" and the spec doesn't go into the
details on which function of the model would/should return the
Usage Out value(s).
In the case of the jitter parameters, most (if not all) of them
would inform the EDA tool on how to jitter the signal. But if
the spec doesn't describe the rules for the model on when it should
return these parameters to the EDA tool, or for the EDA tool on
when to look for these parameters when executing the model, we
can have serious problems.
I am not saying that there are no situations when Usage Out jitter
parameters might be needed or useful, or that these rules can't be
defined in the specification, but as far as I remember, we didn't
want to deal with all this at the time when the question was raised
about Usage Out in the jitter parameters, so the easiest solution at
the time was to remove Usage Out for the jitter parameters.
Considering that defining such rules would require considerable
amount of writing and discussion, I doubt that we can just take care
of this as an editorial change and put back Usage Out for the
jitter parameters. If we did that, we would open the door for all
kinds of incompatibilities and ambiguities which is not desirable.
As usual, comments welcome...
Thanks,
Arpad
=======================================================================
-----Original Message-----
From: ibis-macro-bounce@xxxxxxxxxxxxx [mailto:ibis-macro-bounce@xxxxxxxxxxxxx]
On Behalf Of Bob Ross
Sent: Monday, July 08, 2013 10:57 AM
To: mike@xxxxxxxxxxx; fangyi_rao@xxxxxxxxxxx
Cc: 'Walter Katz'; 'IBIS-ATM'
Subject: [ibis-macro] Re: Usage type of jitter parameters in ibis5.1
All:
Is this worth bringing up at the next ATM meeting?
If there is need to revert back to including Usage Out
for Tx_Jitter and Tx_DCD in Version 6.0 we could do it
with a quick correction BIRD. Usage Out is currently supported
in Version 5.1, so there is no known damage. We could
consider other Jitter and Noise Parameters at that time.
We are editing this area, so we want to get this right
for the next release.
Bob
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