Re: Verilog-AMS Committee Call - 12th May 2011

Here is a list of issues I found while reading the draft, but first.

Regarding Shalom's suggestion to use 1800-2009 as the base for this
specification like was done for 1800-2005; I believe that would be a poor
choice. 1800-2005 was an extension to the functionality in 1364-2005 that was
intended to eventually be merged anyway, so it made complete sense that it used
the other as a reference (base). This specification or at least the Verilog-A
portion is completely independent so I don't see the linkage. My understanding
is that this revision is trying to make the Verilog-A definition compatible with
1800-2009 (Verilog-D). To me, that requires that the common descriptions be
updated to match what is in 1800-2009 not repalced with references to 1800-2009.
I would agree that the digital descriptions belong in 1800-2009, but the analog
definitions and the Verilog-A/Verilog-D interface should be fully specified in
this document not split between this document and 1800-2009. If someone is only
interested in Verilog-A they should not also need 1800-2009 to understand the
specification.

I'm new to the discussion so I may be misunderstanding the purpose of this
revision. I'm sure any misunderstanding will be corrected shortly ;-).

Section two errata.

Page 10, section 2.3:
  spaces, tabs, newlines, and formfeeds are used to define
  white space, but in the last paragraph blanks and tabs are
  used when describing string literals. What is the definition
  of blanks (should this be spaces).

Page 10, syntax 2-1:
  I believe the \n should be in red.

Page 11, syntax 2-1:
  Should \n be excluded from the comment_text definition? Should
  all non-printing characters be excluded?

Page 12, section 2.6.3, 1st sentence:
  This should be user-defined "system" tasks and functions.
  Normal user-defined tasks and functions use a different syntax.

Page 12, syntax 2-2:
  Remove the task_enable syntax since this is describing system
  tasks/function. Add that an analog_system_task_identifier is
  defined to be a system_task_identifier. Also add a definition
  for the analog_system_function_identifier.

Page 13, syntax 2-3:
  The non_zero_unsigned_number should have footnote 2 and the
  "_" character should be in red.

Page 14, section 2.7.1, 6th paragraph:
  The text describes that the number should immediately follow
  the format, but then contradicts this by saying a space is
  allowed between the format and the number. I believe that the
  word "immediately" should be removed.

Page 15, example 2, second line:
  There needs to be a 5 before the `D to make this a 5-bit value.

Page 16, section 2.7.1, last sentence:
  Which X/Z is this sentence referring to?

Page 16, section 2.7.2, 2nd paragraph:
  Add that an underscore cannot be the first character of the
  exponent.

Page 17, section 2.7.3:
  I've always found this section significantly under specified.
  For example:

    How should X/Z be handled when converting to real?

    For large positive/negative real values there are no LSBs
    so should we really use zero for the bit based value?

    In discrete real modeling generating +-inf or NaN is a
    possibility how should these be converted?

  I have some personal opinions on what should be done, but I'll
  save them for future a discussion since this email is focusing
  on errata. Maybe this section should be marked "Needs more
  discussion before release."

----- Original Message ----
From: Dave Miller <David.L.Miller@freescale.com>
To: Verilog-AMS LRM Committee <verilog-ams@eda.org>
Sent: Tue, May 10, 2011 7:10:04 PM
Subject: Verilog-AMS Committee Call - 12th May 2011

Hello all,
We have a call scheduled for Thursday 12th May 2011.

Agenda:
* Review of Chapter 2 - Lexical conventions. Document can be found at:
http://www.eda.org/twiki/bin/view.cgi/VerilogAMS/SVAMSSectionWork#2_Lexical_conventions

* Update on Verilog-AMS representation in the SV-DC.

Call Time: (Thursday 01.00pm UTC):

San Francisco, Thurs 06.00a
Austin, 08.00a
Boston, 09.00a
Amsterdam, 03.00p
Tel Aviv, 04.00p
New Delhi, 06:30p
Adelaide, 10:30p

Call-In Details:
USA Toll Free : 8008671147
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Passcode: 0970751#

Cheers...
Dave

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