[sv-bc] unsized number literals

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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