[sv-bc] RE: Q: [N] array bounds legal for unpacked but not packed arrays?

And I believe the grammar doesn't allow it for packed dimensions, in which case the LRM is clear on this.


From: owner-sv-bc@eda.org [mailto:owner-sv-bc@eda.org] On Behalf Of Bresticker, Shalom
Sent: Tuesday, September 30, 2014 3:40 PM
To: erik.seligman@intel.com; sv-bc@eda.org
Subject: [sv-bc] RE: Q: [N] array bounds legal for unpacked but not packed arrays?

It was not an oversight, but I don't remember the reason this syntax was not extended to packed dimensions as well.

From: owner-sv-bc@eda.org [mailto:owner-sv-bc@eda.org] On Behalf Of Seligman, Erik
Sent: Tuesday, September 30, 2014 22:34
To: sv-bc@eda.org
Subject: [sv-bc] Q: [N] array bounds legal for unpacked but not packed arrays?


Recently I saw a vendor tool fail on a declaration like this:

    logic [N]   foo;

To make it work, I had to change it to

    logic [N-1:0] foo;

Looking at section 7.4.1-7.4.2 of the LRM, it seems like this option of a single number for the array bound declaration is described only for unpacked arrays.    It doesn't specifically say it's not allowed for packed arrays, so many tools accept it, but it doesn't directly allow it either.

Is this difference in syntax requirements between packed and unpacked array bounds an oversight, or is there an intentional reason for it?

Thanks!


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