[ibis-macro] Re: A technical question on UI
- From: <radek_biernacki@xxxxxxxxxxx>
- To: <Arpad_Muranyi@xxxxxxxxxx>, <ibis-macro@xxxxxxxxxxxxx>
- Date: Wed, 18 Apr 2012 16:53:16 -0600
Hi Arpad,
I am as surprised by this interpretation as you are.
Actually, even for the reserved parameters I do not recall any requirement to
convert a value specified in terms of UI to absolute seconds. In other words if
the model creator designates a parameter as of type UI the model should expect
the fraction of UI (time normalized w.r.t. the bit time) as its input.
Otherwise, why would we need Type UI at all?
Radek
-----Original Message-----
From: ibis-macro-bounce@xxxxxxxxxxxxx [mailto:ibis-macro-bounce@xxxxxxxxxxxxx]
On Behalf Of Muranyi, Arpad
Sent: Wednesday, April 18, 2012 3:09 PM
To: IBIS-ATM
Subject: [ibis-macro] A technical question on UI
Hello everyone,
An interesting question was raised in the Editorial Committee meeting this
morning, and I got the AR to write an email on this reflector to solicit for
some comments and feedback.
The question is revolving around parameters which are expressed in terms of UI
(unit interval). A statement was made in the Editorial Committee meeting this
morning, that if a parameter is a Reserved_Parameter, the tool will know what
to do with it because all Reserved_Parameters are completely described in the
specification.
However, if the parameter is a Model_Specific parameter, the EDA tool will have
to convert the value from UI to time and pass the time value to the AMI
executable model.
For example, if the bit time is 400e-12 (ps) and the UI value is
0.5 for a certain parameter, the EDA tool would have to pass
200e-12 to the DLL, and not 0.5.
(Please correct me if this summary is not accurate).
This surprised me, because I don't recall anything in the IBIS-AMI
specification that states that the EDA tool has to convert parameters expressed
in UI to time and pass the time value to the DLL. If I were writing the
simulation software, I would just pass 0.5 to the DLL.
Does anyone have any comments on how this is supposed to be handled by the EDA
tool?
Once we have consensus on that question, the next question will be whether we
can correct/clarify this as part of the Editorial Committee, or whether a BIRD
is necessary to address this question.
Thanks in advance for the comments,
Arpad
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