RE: [sv-bc] Query about '1

See more on parameter assignment in Mantis 1065.
 
Shalom


________________________________

	From: owner-sv-bc@server.eda.org
[mailto:owner-sv-bc@server.eda.org] On Behalf Of Bresticker, Shalom
	Sent: Tuesday, July 08, 2008 4:40 PM
	To: Banerjee, Ayan; sv-bc@server.eda-stds.org
	Subject: RE: [sv-bc] Query about '1
	
	
	I think the answers should be:


________________________________

		From: owner-sv-bc@server.eda.org
[mailto:owner-sv-bc@server.eda.org] On Behalf Of Banerjee, Ayan
		Sent: Tuesday, July 08, 2008 3:57 PM
		To: sv-bc@server.eda-stds.org
		Subject: [sv-bc] Query about '1
		
		

		Hi,

		 

		I have 3 queries about what should be the correct
behavior for the following 3 cases.

		 

		1)

		What should be behavior if '1 is passed to a port as is
done in the following testcase?

		 

		module top;

		bottom inst('1);

		endmodule

		 

		module bottom(a);

		input [63:0] a;

		 

		initial

		    $display("%b", a);

		endmodule

		 

		 Should it be a)
1111111111111111111111111111111111111111111111111111111111111111 or

		                    b)
zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz1 or

		                    c)
0000000000000000000000000000000000000000000000000000000000000001

		 

		[SB] a. This should be treated as the continuous
assignment "bottom.a = '1" . 

		 

		 

		2) What should be the behavior if '1 is used as
parameter value

		module top;

		parameter [63:0] p1 = '1;

		initial

		    $display("%b",p1);

		endmodule

		 

		Should it be a)
1111111111111111111111111111111111111111111111111111111111111111 or

		                  b)
0000000000000000000000000000000000000000000000000000000000000001

		 

		[SB] a. Treated as assignment "p1[63:0] = '1". 

		 

		3) Similar to 2 but in a more general case what should
be the value of parameter if range is specified which is more than 32
but the expression assigned is of 32 bit. Should the expression be
evaluated in 32 bit or with the size of parameter?

		 

		module top;

		parameter [63:0] p1 = 1'b1 << 63;

		initial

		    $display("%b",p1);

		endmodule

		 

		Should it be a)
0000000000000000000000000000000000000000000000000000000000000000  or

		                  b)
1000000000000000000000000000000000000000000000000000000000000000

		 

		The behavior of simulators are different in the above
cases. Thanks in advance for your help.

		 [SB] With the size of the parameter. The answer should
be b. We discussed this in the past.

		 

		Shalom

		 

		 

		 

		 

		-Regards,

		Ayan

	
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