Re: [sv-bc] RE: Is '1 allowed in a concatenation?

I agree, '1 should be allowed in a concatenation. In a self-determined context, '1 is 1-bit wide. We don't allow unsized integer constants because there is not a defined bit-width for an integer (32 or 64?), but this problem doesn't apply for '1.

Paul
----- Original Message -----
From: "Yulik Feldman" <yulik.feldman@intel.com>
To: "Shalom Bresticker" <shalom.bresticker@intel.com>
Cc: sv-bc@eda.org
Sent: Monday, March 22, 2010 9:07:27 AM
Subject: [sv-bc] RE: Is '1 allowed in a concatenation?

Nice catch. But why not to allow them, writing '1 in concatenation operands is simpler than writing 1b'1, and if the semantics would be well-defined, it would just improve the user experience.

From: owner-sv-bc@eda.org [mailto:owner-sv-bc@eda.org] On Behalf Of Bresticker, Shalom
Sent: Monday, March 22, 2010 2:46 PM
To: sv-bc@eda.org
Subject: [sv-bc] Is '1 allowed in a concatenation?

Is a literal like '1 allowed in a concatenation?

On the one hand, 11.4.12 says, "Unsized constant numbers shall not be allowed in concatenations. This is because the size of each operand in

the concatenation is needed to calculate the complete size of the concatenation."

On the other hand, 5.7.1 says, "An unsized single-bit value can be specified by preceding the single-bit value with an apostrophe ( ' ), but without the base specifier. All bits of the unsized value shall be set to the value of the specified bit. In a self-determined context, an unsized single-bit value shall have a width of 1 bit, and the value shall be treated as unsigned."

I tend to the interpretation that they are not allowed.

Shalom

Shalom Bresticker

Intel LAD DA, Jerusalem, Israel

+972 2 589 6582 (office)

+972 54 721 1033 (cell)

http://www.linkedin.com/in/shalombresticker

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