Re: errata/226: PROPOSAL - Illegal to assign mintypmax expression to parameter?

From: Shalom.Bresticker@motorola.com
Date: Sun Jun 22 2003 - 22:40:04 PDT

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    The following reply was made to PR errata/226; it has been noted by GNATS.

    From: Shalom.Bresticker@motorola.com
    To: etf-bugs@boyd.com
    Cc:
    Subject: Re: errata/226: PROPOSAL - Illegal to assign mintypmax expression
     to parameter?
    Date: Mon, 23 Jun 2003 08:37:52 +0300 (IDT)

     I do not accept that explanation.
     
     Historically, specparams were only allowed in specify blocks.
     Only in 1364-2001 were they allowed also outside of specify blocks.
     
     Parameters were always allowed min:typ:max expressions.
     The only question is about the parentheses.
     As already pointed out, even the 1364-1995 tools allow them without parentheses
     in certain situations.
     
     Shalom
     
     
    > Keep the existing behaviour. Section 3.11.3 describe the difference between
       parameters and specify parameters and it states that specify parameters is a
       special type of parameter intended only for providing timing and delay values.
       Specparams allow the use of mintypmax_expression but parameter declarations
       does not. Table 8 in section 3.11.3 is clearly stating that parameters may not
       be assigned specparams so it is ok that they are declared differently.
     
    > Parameters may be assigned constant_expressions which include constant_primary and
       constant_primary include (constant_mintypmax_expression), hence example
       m_legal is OK but m_illegal is not.
    >
    > Add the following line in the last example in section 3.11.1:
    > parameter p = (1:2:3); //parenthesis required since constant_mintypmax_expression is not allowed.
     
    > http://boydtechinc.com/cgi-bin/issueproposal.pl?cmd=view&pr=226
     
     --
     Shalom Bresticker Shalom.Bresticker@motorola.com
     Design & Reuse Methodology Tel: +972 9 9522268
     Motorola Semiconductor Israel, Ltd. Fax: +972 9 9522890
     POB 2208, Herzlia 46120, ISRAEL Cell: +972 50 441478
     

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