defparams

From: Shalom Bresticker (Shalom.Bresticker@freescale.com)
Date: Tue Jun 29 2004 - 00:02:28 PDT

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    Since we mentioned defparams yesterday, I'd like to give an example how we use
    them.
    The following description is only approximate.

    In our gate-level cell libraries, every cell definition has a parameter called
    Xfilter,
    which when set to 1, which is default, causes the output of the cell to go to X
    if there is a timing violation on the inputs, e.g., in an SDF simulation.

    However, sometimes you don't want that behavior,
    such as on the first flipflop of a synchronizer.

    So we attach a file which is the list of cell instances in which we want to
    disable this behavior.
    Each line is of the form:

    defparam top. ....full hierarchial path ...cell_instance_name.Xfilter = 0 ; 

    --
Shalom Bresticker                         Shalom.Bresticker @freescale.com
Design & Reuse Methodology                            Tel: +972 9  9522268
Freescale Semiconductor Israel, Ltd.                  Fax: +972 9  9522890
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