[sv-bc] RE: uniszed unbased literal in a concatenation

Actually, 2 out of 3 that I tried now on regular unsized constants issued errors.
The other issued a warning.

Shalom

From: owner-sv-bc@eda.org [mailto:owner-sv-bc@eda.org] On Behalf Of Rich, Dave
Sent: Monday, October 07, 2013 19:25
To: SV_BC List
Subject: [sv-bc] RE: uniszed unbased literal in a concatenation

Most simulators allow un-sized constants in a concatenation regardless of the standard anyways.

Dave
Mentor Graphics

From: owner-sv-bc@eda.org<mailto:owner-sv-bc@eda.org> [mailto:owner-sv-bc@eda.org] On Behalf Of Bresticker, Shalom
Sent: Monday, October 07, 2013 8:42 AM
To: SV_BC List
Subject: [sv-bc] uniszed unbased literal in a concatenation

Hi, Consider this code:

module test1;

wire [2:0] w1;
wire [3:0] w ;

assign w = {'0, w1};

endmodule

Is this concatenation legal because '0 is 1 bit wide in a self-determined context, or is it illegal because it is an unsized constant in a concatenation?

I tend toward the first interpretation, but I see that some tools accept it and some do not.

Thanks,
Shalom

Shalom Bresticker
Intel, Networking Division DA, Jerusalem, Israel
+972  2 589 6582 (office)
+972 54 721 1033 (cell)
http://www.linkedin.com/in/shalombresticker




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