[ibis-macro] BIRD 117 AMI parameter uniqueness
- From: Mike LaBonte <mike@xxxxxxxxxxx>
- To: IBIS-ATM <ibis-macro@xxxxxxxxxxxxx>
- Date: Sat, 7 Apr 2012 09:02:59 -0400
As we have been discussing BIRD 117, which offers a way to reference
AMI-style parameters trees, I am wondering if we might suffer from
name ambiguity. Consider this fragment of a .ami file:
(Model_Specific
(dfe
(mode (Usage In)(Type Integer)(List 0 1)(Description "DFE on/off
control"))
)
(agc
(mode (Usage In)(Type Integer)(List 0 1)(Description "AGC on/off
control"))
)
)
The parameter "mode" appears twice, but as far as I can tell that is
legal because it follows the BIRD 127 rule that "Each sub-branch of a
branch must have a unique name.". I can't find any rule disallowing
two parameters with the same name in different branches.
EDA tools handle this ambiguity by using a syntax like "dfe.mode" and
"agc.mode" when giving users control. But nothing like that is
suggested in BIRD 117. The examples there are simple parameter names
like "MyTrise". It seems it would be up to the EDA tool to walk
through the various branch levels until it finds a parameter at any
level with a matching name. If only one is found, great. If more than
one is found ... then what?
I would feel more comfortable if parameters were always referenced by
full hierarchy. For example:
| D_to_A d_port port1 port2 vlow vhigh trise
tfall corner_name
D_to_A D_drive my_drive my_ref MyVlow MyVhigh1 MyTfall MyTrise Typ
could be...
| D_to_A d_port port1 port2 vlow vhigh trise
tfall corner_name
D_to_A D_drive my_drive my_ref (Vlow) (Vhigh1) (Tfall) (Trise) Typ
or...
| D_to_A d_port port1 port2 vlow vhigh trise
tfall corner_name
D_to_A D_drive my_drive my_ref (Vd2a(low)) (Vd2a(high))
(Td2a(fall)) (Td2a(rise)) Typ
depending on where the parameters fall in the tree hierarchy.
Mike
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