RE: [sv-bc] Some query related with enum.

I would say:

The legal values for enum names are

2'sb10  (-2)
2'sb11  (-1)
2'sb00  (0)
2'sb01  (1)

So RED becomes 2'sb10, which is -2.

YELLOW becomes 2'sb11, which is -1.

Case 1: GREEN = 2'b00 , which is 0. This looks OK.
Case 2: GREEN = 2'b11. This is 3, which is outside the representable
range of the enum, so it should be illegal. Even if you say that 2'b11
is converted to 2'sb11, it duplicates YELLOW, and is still illegal.
Case 3: GREEN = 2'b10. This is 2. For similar reasons, this should also
be illegal.
Case 4: GREEN = 3. Also outside the representable range, and thus also
illegal.

> typedef enum reg signed [1:0] { RED = 2'sb10,YELLOW,GREEN = 2'b00}
light; 
> typedef enum reg signed [1:0] { RED = 2'sb10,YELLOW,GREEN = 2'b11}
light; 
> typedef enum reg signed [1:0] { RED = 2'sb10,YELLOW,GREEN = 2'b10}
light; 
> typedef enum reg signed [1:0] { RED = 2'sb10,YELLOW,GREEN = 3} light;
> 
> Can you let me know that which one should be correct and 
> which one are wrong as different simulator are behaving in 
> different way.

Regards,
Shalom
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