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

The idea was that a user can create a vector from integer_vector_types, but I understand the confusion.

Shalom
 

> -----Original Message-----
> From: Paul Graham [mailto:pgraham@oasys-ds.com]
> Sent: Tuesday, March 09, 2010 4:42 PM
> To: Bresticker, Shalom
> Cc: sv-bc
> Subject: 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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