Re: [sv-bc] Can enum base type be struct or multidim array?

Shalom,

No, you didn't miss anything -- I did. Thanks for the reply.

I have to say, the names "integer_atom_type" and "integer_vector_type" are a bit confusing. I understand that integer_atom_type is an "atomic" integer type. Yet integer_atom_type is a vector of bits, while integer_vector_type is a single bit, not a vector.

Paul
----- Original Message -----
From: "Shalom Bresticker" <shalom.bresticker@intel.com>
To: "Paul Graham" <pgraham@oasys-ds.com>, "sv-bc" <sv-bc@eda.org>
Sent: Tuesday, March 9, 2010 9:36:03 AM
Subject: RE: [sv-bc] Can enum base type be struct or multidim array?

Paul,

This is the BNF:

enum_base_type ::=
        integer_atom_type [ signing ]
   | integer_vector_type [ signing ] [ packed_dimension ]
   | type_identifier [ packed_dimension ] 14

14) A type_identifier shall be legal as an enum_base_type if it denotes an integer_atom_type, with which an additional
packed dimension is not permitted, or an integer_vector_type.

integer_atom_type ::= byte | shortint | int | longint | integer | time
integer_vector_type ::= bit | logic | reg

So I don't see that the types you mention are legal.

Did I miss something?

Regards,
Shalom

> -----Original Message-----
> From: owner-sv-bc@eda.org [mailto:owner-sv-bc@eda.org] On
> Behalf Of Paul Graham
> Sent: Tuesday, March 09, 2010 4:28 PM
> To: sv-bc
> Subject: [sv-bc] Can enum base type be struct or multidim array?
>
> It appears that an enum type can be declared with a base type
> which is a packed struct or multidimensional array. That is,
> I don't see any rule prohibiting the following:
>
> typedef struct packed {logic f1, f2, f3;} t1;
> enum t1 {red, blue, green} color1;
>
> typedef logic [1:0][1:0] t2;
> enum t2 {orange, yellow, violet} color2;
>
> If this is legal, then is it legal to access an enum value as
> if it were of the base type? Can
> you do:
>
> logic x = color1.f1;
> logic y = color2[1][0];
>
> Paul
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