[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

 

 

 

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

 

 

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.

 

-Regards,

Ayan

.

 


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