[ibis-macro] Re: issue raised by Walter in last ATM
- From: "Muranyi, Arpad" <Arpad_Muranyi@xxxxxxxxxx>
- To: "ibis-macro@xxxxxxxxxxxxx" <ibis-macro@xxxxxxxxxxxxx>
- Date: Mon, 15 Jul 2013 21:38:47 +0000
That's what "Format Corner" actually does (pg. 182 in v5.1):
For AMI parameters defined as Format Corner, the EDA tool will pick one of the
three supplied values (<typ value>, <slow value>, <fast value>) in the
parameter definition file for any given model instance. This selection is
governed by the same internal corner variable in the EDA tool that controls the
selection of the "Typ", "Min", "Max" model data. <typ value> corresponds to
"Typ", <slow value> corresponds to "Min" (slow or weak performance) and <fast
value> corresponds to "Max" (fast or strong performance). For AMI parameters,
<slow value> does not have to be less than <fast value>.
Or am I missing something?
Arpad
============================================================
-----Original Message-----
From: fangyi_rao@xxxxxxxxxxx [mailto:fangyi_rao@xxxxxxxxxxx]
Sent: Monday, July 15, 2013 4:36 PM
To: Muranyi, Arpad; ibis-macro@xxxxxxxxxxxxx
Subject: RE: issue raised by Walter in last ATM
Arpad;
That's because EDA tools must make sure that the corner value in the input
parameter string to AMI_Init is consistent with the legacy IBIS model that is
being used.
Fangyi
-----Original Message-----
From: ibis-macro-bounce@xxxxxxxxxxxxx [mailto:ibis-macro-bounce@xxxxxxxxxxxxx]
On Behalf Of Muranyi, Arpad
Sent: Monday, July 15, 2013 2:33 PM
To: ibis-macro@xxxxxxxxxxxxx
Subject: [ibis-macro] Re: issue raised by Walter in last ATM
Fangyi,
I am not sure why a new reserved parameter for corner is needed. Wouldn't the
following work in the Model_Specific
section:
(corner (Usage In) (Corner "Typ" "Min" "Max") (Type String)
(Description "Simulation corner."))
Thanks,
Arpad
=========================================================
-----Original Message-----
From: ibis-macro-bounce@xxxxxxxxxxxxx [mailto:ibis-macro-bounce@xxxxxxxxxxxxx]
On Behalf Of fangyi_rao@xxxxxxxxxxx
Sent: Monday, July 15, 2013 4:25 PM
To: ibis-macro@xxxxxxxxxxxxx
Subject: [ibis-macro] issue raised by Walter in last ATM
Hi, All;
Walter raised an issue during the AMI_Resolve API discussion at last ATM. Since
Dep parameters are not included in the input parameter string to AMI_Init, if
AMI_Init needs to use a Dep parameter value, it'll have to repeat the
calculation in AMI_Resolve. If the parameter depends on corner and/or model
name, AMI_Init cannot access them in current spec. In fact, this issue exists
regardless AMI_Resolve is used or not.
There are two potential solutions.
Solution 1: Require all Dep parameters to be included in the input parameter
string to AMI_Init.
Pro: minimum change to the spec
AMI_Init doesn't need to repeat the calculation in AMI_Resolve
Con: lots of Dep parameters are not designed to be used by AMI_Init
AMI_Init still has no access to corner and model name
Solution 2: Introduce two new AMI reserved parameters, Corner and Model_Name
Required: No
Usage: In
Type: String
Format: Value
Allowed values of Corner: typ, min, max
Allowed values of Model_Name: any string
Their values specified in the .ami file are irrelevant. EDA tools must make
sure that their values in the input parameter string to AMI_Init are consistent
with the legacy IBIS model that is being used.
Pro: AMI_Init has access to corner and model name regardless whether
AMI_Resolve exists.
Con: Two new reserved parameters
AMI_Init repeats the calculation in AMI_Resolve
Let's discuss at tomorrow's ATM.
Thanks,
Fangyi
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