[ibis-macro] Re: Typos_Format_Value_Default_BIRD_4 discussion
- From: "Muranyi, Arpad" <Arpad_Muranyi@xxxxxxxxxx>
- To: "IBIS-ATM" <ibis-macro@xxxxxxxxxxxxx>
- Date: Fri, 22 Oct 2010 10:50:28 -0700
Bob,
I am looking at the "txtaps" example, and I don't understand
what you are saying with "parameter_structure_x". Here is
the example from pg. 150:
(Model_Specific | Required heading
(txtaps
(-2 (Usage Inout)(Type Tap) (Format Range 0.1 -0.1 0.2)(Default
0.1)
(Description "Second Precursor Tap"))
(-1 (Usage Inout)(Type Tap) (Format Range 0.2 -0.4 0.4)(Default
0.2)
(Description "First Precursor Tap"))
(0 (Usage Inout)(Type Tap) (Format Range 1 -1 2)(Default 1)
(Description "Main Tap"))
(1 (Usage Inout)(Type Tap) (Format Range 0.2 -0.4 0.4)(Default2
0.2)
(Description "First Post cursor Tap"))
(2 (Usage Inout)(Type Tap) (Format Range 0.1 -0.1 0.2)(Default
0.1)
(Description "Second Post cursor Tap"))
) | End txtaps
As far as I understand, the "-2", "-1",... "2" entries are
parameter names which are followed by Usage, Type, Format,
Default and Description. This corresponds to:
|* (parameter_name (Usage <usage>)
|* (Type <data_type>)
|* (Format <data_format> <data>)
|* (Default <value>)
|* (Description <string>)
|* )
Where is "parameter_structure" in this? Also, what is
"txtap"? Is it a parameter name, or branch name, or what?
(I am still struggling with understanding what branches
and leafs really are)...
Thanks,
Arpad
============================================================
-----Original Message-----
From: Bob Ross [mailto:bob@xxxxxxxxxxxxx]
Sent: Thursday, October 21, 2010 10:17 AM
To: Muranyi, Arpad
Cc: IBIS-ATM; bob@xxxxxxxxxxxxx
Subject: Re: [ibis-macro] Typos_Format_Value_Default_BIRD_4 discussion
Arpad:
There are probably several effective ways to document the
general syntax, such as with your proposal shown here. In fact
it could be reduced to the last choice with some notes nearby.
|* All parameters must be in one of the two following
|* formats (order not important):
|*
|* (parameter_name (Usage <usage>)
|* (Type <data_type>)
|* (<data_format> <data>)
|* (Default <value>)
|* (Description <string>))
|*
|* (parameter_name (Usage <usage>)
|* (Type <data_type>)
|* (Format <data_format> <data>)
|* (Default <value>)
|* (Description <string>))
1. The word 'Format' is optional and can be ignored by EDA tools.
The examples in this section not show the word 'Format'.
2. Certain Reserved_Parameter names allow only certain <data_format>
selections, as sumarized in Table ....
3. When permitted, the <data_format> selection of Value and Default
are always mutually exclusive. Value or Default are required, but
Value and Default cannot be used together.
4. <data_format> is always required for selections other than Value
5. Default is optional when <data format> is not Value.
------
These clarification should be documented with the syntax, even if they
repeat what is stated 3 or pages elsewhere.
Note, rule 3. The current specification requires Format for all
parameters except the first four Reserved_Parameters, and makes
Default optional. So the cases for Value and Default together are
currently allowed. However, due to lack of clarity, it does make
sense to make this awkward situation illegal, as proposed. The
few models that have this can be fixed.
Finally the more general rule, at least for Model_Specific
parameters at this time, is that parameter_structures are
optionally part of the syntax - recursively. If the whole
syntax can be referred to as a 'parameter_structure', the
more general syntax is:
|* (parameter_name (Usage <usage>)
|* (Type <data_type>)
|* (Format <data_format> <data>)
|* (Default <value>)
|* (Description <string>)
(paramater_structure_1)
(parameter_structure_2)
....
|* )
The example for txtaps illustrates this. The parameter_name
'txtaps' encloses parameter structures for each tap parameter
name: '-2' to '2'. This is consistent with the general
tree-structure basis of the .ami file.
Bob
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