[ibis-macro] Re: usage type of Tx_DCD and Tx_Jitter in IBIS 6.0
- From: "Walter Katz" <wkatz@xxxxxxxxxx>
- To: <fangyi_rao@xxxxxxxxxxx>, <ibis-macro@xxxxxxxxxxxxx>
- Date: Wed, 3 Jul 2013 21:44:21 -0400 (EDT)
Fangyi,
When BIRD 123 was discussed, we had a specific discussion on whether the
new parameters should be Info or Info/Out, I left that decision to the ATM
committee. The ATM committee agreed that they should be only Info, and for
consistency Tx_DCD and Tx_Jitter should not be out. I think some of the
EDA vendors did not want the simulator to change behavior as the results
of outputs of the Model, but I think you should go back to the minutes for
more specific reasons. The version BIRD_123.3_Draft2.docx (11/1/2011) had
all of the new parameters as Info or Out, BIRD_123 3_Draft3.docx
(12/14/2011) had them just Info. Also in BIRD_123.3_Draft2.docx
(11/1/2011) there was the following that got removed when we chose to make
these parameters just Info:
Note:
The EDA Tool/Simulator shall use the values of these Jitter and Noise
parameters directly if they are Usage Info. If they are Usage Out, then
the EDA Tool/Simulator shall use their values generated by AMI_Init. The
model's AMI_GetWave function may return different values for these
parameters than the values returned by AMI_Init; the EDA Tool/Simulator
may report the values of such parameters to the user, but the EDA
Tool/Simulator may not change any inputs to AMI models or change other
result of the simulation based on the values returned for the parameters
in this BIRD by AMI_GetWave.
SiSoft could have gone either way, but deferred to the other EDA vendors
who felt that they did not want to support these parameters changing on
the fly.
So you can look at the minutes between November 1 and December 14 to find
out who said what and why the decision was made this way.
Walter
From: ibis-macro-bounce@xxxxxxxxxxxxx
[mailto:ibis-macro-bounce@xxxxxxxxxxxxx] On Behalf Of
fangyi_rao@xxxxxxxxxxx
Sent: Wednesday, July 03, 2013 7:56 PM
To: ibis-macro@xxxxxxxxxxxxx
Subject: [ibis-macro] usage type of Tx_DCD and Tx_Jitter in IBIS 6.0
It seems that in IBIS 6.0 Tx_DCD and Tx_Jitter are no longer allowed to
have usage type Out. Can anyone remind me why?
Thanks,
Fangyi
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