errata/228: PROPOSAL - 4.2.1, indexed part-select with width-expression of -5

From: Shalom.Bresticker@motorola.com
Date: Thu Jan 02 2003 - 01:33:44 PST

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    1. Legal values for the width expressions should be a
    semantic restriction. Specifically, after the sentence,
    "The width_expr shall be a constant expression.",
    add the following:
              
    "The value of the width_expr shall be a positive integer."

    2. Change the Examples preceding Example 1,
    from "reg [31:0] big_vect;" to
    "dword[8*sel +:8] = big_vect[7:0]; // Replace the byte selected."

    with the following:

    <pre>
    reg [31: 0] big_vect;
    reg [0 :31] little_vect;
    reg [63: 0] dword;
    integer sel;

    big_vect[ 0 +: 8] // == big_vect[ 7 : 0]
    big_vect[15 -: 8] // == big_vect[15 : 8]

    little_vect[ 0 +: 8] // == little_vect[0 : 7]
    little_vect[15 -: 8] // == little_vect[8 :15]

    dword[8*sel +: 8] // variable part-select with fixed width
    </pre>
     
    ("reg" and "integer" keywords in bold)
     
    http://boydtechinc.com/cgi-bin/issueproposal.pl?cmd=view&pr=228

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