[ibis-macro] issue raised by Walter in last ATM
- From: <fangyi_rao@xxxxxxxxxxx>
- To: <ibis-macro@xxxxxxxxxxxxx>
- Date: Mon, 15 Jul 2013 15:25:07 -0600
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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