[ibis-macro] Re: AMI BIRD Default Amendment

  • From: Bob Ross <bob@xxxxxxxxxxxxx>
  • To: Walter Katz <wkatz@xxxxxxxxxx>
  • Date: Fri, 26 Feb 2010 00:00:41 -0800

Walter:

Without getting into other detailed concerns, the proposed Default amendment
as stated is works as applied to the Boolean parameters.  I was not clear
that my specific concern is where the amendment does not apply:

Ignore_Bits:
|
|              Ignore_Bits is of usage Info and type Integer.  Allowed-Value
|              must be Value. It tells the
|              EDA platform how long the time variant model takes to complete
|              initialization.  This parameter is meant for AMI_GetWave
|              functions that model how equalization adapts to the input
|              stream.  The value in this field tells the EDA platform how
|              many bits of the AMI_Getwave output should be ignored.
|              Examples of Ignore_Bits declaration are:
|               (Ignore_Bits (Usage Info)(Type Integer) (Value 100))



It states that Allowed Value MUST be Value.  That means any model with
or without Default is syntactically invalid.   So the parser developer
will create an Error condition if Value is missing even if Default exists.

We could state that either Value OR Default is required as one option
for Ignore_Bits to resolve this.

Bob


Walter Katz wrote:

Bob,

My intent was to make it simple and allow Default as an alternative to Value
for all parameters, thus eliminating and special code for specific
parameters. Note that all 5.0 AMI models will work, it just relaxes a rule a
little. The recommended way for future models is to use Value instead of
Default for all parameters, but one will be able to use either Default or
Value. Note that if there is both Default and Value specified, and since
Default must be a legal Allowed Value then either the value of Default must
equal the value of Value or the Value must me NA.

The following
Currently Value is required and therefore not identified as a
parameter which will allow only Default per V5.0.  This is also
rigidly enforced in V5.0 IBIS-AMI.  A rule for this case needs to be
added.
I disagree that a rule needs to be added for this. True the existing parse
will need to be modified for the new AMI format, but the existing 5.0 AMI
files which obey the above rule will still pass the new parser.

Walter

Walter Katz
303.449-2308
Mobile 720.333-1107
wkatz@xxxxxxxxxx
www.sisoft.com

-----Original Message-----
From: Bob Ross [mailto:bob@xxxxxxxxxxxxx]
Sent: Tuesday, February 23, 2010 8:54 PM
To: wkatz@xxxxxxxxxx
Cc: IBIS-ATM
Subject: Re: [ibis-macro] AMI BIRD Default Amendment

Walter:

Ok, this is a combined amendment where we are also assuming
that we now can make optional certain parameters in five "boolean"
keywords.   The simple sentence

|       If there is no Allowed-Value method, and (Default <value>) is
specified,

          then the
|       only Allowed Value will be <value>.

We need to identify explicitly which parameters support "no allowed-value".

Specifically we are now creating special case rules for a group of
"boolean_reserved_parameters" where we can optionally omit either or both
Value and Type.

   Init_Returns_Impulse |      || Required   || first 5 are boolean
parameters
   GetWave_Exists |            || Required
   Use_Init_Output |

   Init_Returns_Filter |       || New

   Max_Init_Aggressors |

Page 144 of the spec also applies to Ignore_Bits, of Type Integer.

   Ignore_Bits |               || Type Integer, different rules

Currently Value is required and therefore not identified as a
parameter which will allow only Default per V5.0.  This is also
rigidly enforced in V5.0 IBIS-AMI.  A rule for this case needs to be
added.

Bob

I still object to making some of the syntax optional, but that
will be on my issues to be resolved/discussed list.


Walter Katz wrote:


All,



I am enclosing a ?Default Amendment?, that should allow IBIS 5.0 ami
files to be legal in the revised standard by allowing Default to be
specified without having an Allowed Value field. In effect, Default
becomes an alternative way of saying Value.



Walter



Walter Katz

303.449-2308

Mobile 720.333-1107

wkatz@xxxxxxxxxx

www.sisoft.com







--
Bob Ross
Teraspeed Consulting Group LLC     Teraspeed Labs
121 North River Drive              13610 SW Harness Lane
Narragansett, RI 02882             Beaverton, OR 97008
401-284-1827                       503-430-1065
http://www.teraspeed.com           503-246-8048 Direct
bob@xxxxxxxxxxxxx

Teraspeed is a registered service mark of Teraspeed Consulting Group LLC





--
Bob Ross
Teraspeed Consulting Group LLC     Teraspeed Labs
121 North River Drive              13610 SW Harness Lane
Narragansett, RI 02882             Beaverton, OR 97008
401-284-1827                       503-430-1065
http://www.teraspeed.com           503-246-8048 Direct
bob@xxxxxxxxxxxxx

Teraspeed is a registered service mark of Teraspeed Consulting Group LLC

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