Re: [sv-bc] unsized number literals

From: Surya Pratik Saha <spsaha@cal.interrasystems.com>
Date: Wed Aug 04 2010 - 04:52:53 PDT

Hi Dhiraj,
I don't agree, I did not get anything explicit in LRM supporting your answer. We have already discussed about that in past. See the mail thread with subject "Query about '1" around early July 2008 time frame.

Regards
Surya

-------- Original Message  --------
Subject: Re:[sv-bc] unsized number literals
From: Dhiraj Kumar Prasad <dhiraj@cal.interrasystems.com>
To: Bresticker, Shalom <shalom.bresticker@intel.com>
Cc: "sv-bc@eda.org" <sv-bc@eda.org>, Dhiraj Kumar Prasad <dhiraj@cal.interrasystems.com>
Date: Wednesday, August 04, 2010 5:09:57 PM

Hello Shalom,

The correct behavior should be 2'b11 . Even I  have  tested the three simulator and  all are giving 2'b11 as output
with One of them is showing warning as  port size differ in port connection.

-dhiRAj



Bresticker, Shalom wrote:

Consider the following code:

 

module top;

bot bot('1);

endmodule

 

 

module bot(input [1:0] i);

initial #10 $displayb(i);

endmodule

 

We have a port connection of '1 to a 2-bit port.

 

I would expect '1 to expand to 2'b11 without a problem.

 

In fact, the three simulators I tested showed different behaviors.

 

One did in fact show that i was assigned 2'b11 without any problem.

 

One simulator also assigned 2'b11 to i, but also issued a port-size mismatch warning.

 

One simulator also issued such a warning and assigned 2'bz1 to i.

 

What is the correct behavior?

 

Thanks,

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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