Re: continuous assignment LHS

From: Gordon Vreugdenhil (gvreugde@synopsys.com)
Date: Wed Jan 15 2003 - 08:25:58 PST

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    Shalom Bresticker wrote:
    >
    > Precedence: bulk
    >
    > Question:
    > With the addition in 1364-2001 of multi-dimensional nets and array
    > element
    > bit-selects and part-selects, what was the intention to allow on the
    > left-hand side of continuous assignments?
    >
    > The BNF of the LHS is net_lvalue, which allows an arbitrary array
    > element constant bit-select or part-select.
    >
    > Was that the intention?

    I can't really address the original intent, but I would certainly
    consider a multi-dimensional net with all constant indices to be a
    structural net expression. If not, then you couldn't use them in
    a port connect either which is "clearly" against the expected use
    with generate. Since the LHS of a continuous assign just needs to
    be a structural net expression, I consider LHS constant-indexed
    multidimensional net selects to be valid. BTW, this also includes
    fully constant indexed part selects (I lump "indexed part select"
    as a form of "part select" but didn't know if you were assuming that
    as well in your comments above).

    Gord.

    > While we discussed this with respect to procedural assignments
    > (e.g., http://www.boydtechinc.com/btf/archive/btf_2002/1815.html),
    > I don't know what was the intent with respect to continuous assignments.
    >
    > Anyone remember?
    >
    > --
    > 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
    >
    > "The devil is in the details." 

    -- 
----------------------------------------------------------------------
Gord Vreugdenhil                                 gvreugde@synopsys.com
Staff Engineer, VCS (Verification Tech. Group)   (503) 547-6054
Synopsys Inc., Beaverton OR

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