Passing user-defined types through the port (global variable

Guest
I have had to define a data type to deal with logarithmic values. It's
basically a real number ranging from -10000 to 10000. However, I would like
to use this user-defined data type in the entity of the device, i.e. given
the user-defined type is called llrValue, the architecture port would be

ENTITY sova_decoder IS
PORT (
Approiri : IN llrValue
)

Where do I define the data type such that it would be recognised once it
appears in the entity? Or is there some other way to do this?

cheers



--
- Kwaj
http://alpha400.ee.unsw.edu.au/~p3015094
 
<dougs@dougs.com> wrote in message
news:bvpvpp$slu$1@tomahawk.unsw.edu.au...
I have had to define a data type to deal with logarithmic values.
It's
basically a real number ranging from -10000 to 10000. However, I
would like
to use this user-defined data type in the entity of the device, i.e.
given
the user-defined type is called llrValue, the architecture port
would be

ENTITY sova_decoder IS
PORT (
Approiri : IN llrValue
)

Where do I define the data type such that it would be recognised
once it
appears in the entity? Or is there some other way to do this?
Click to expand...
You need to use a package, e.g.

package types is

subtype llrvalue is real range -10000.0 to 10000.0;

end;

Then if you compile it into the same library you are using for your
entity, it will appear in the current working library, so you can
say

use WORK.types.all;
entity sova_decoder is ...


regards

Alan

--
Alan Fitch
Consultant

DOULOS - Developing Design Know-how
VHDL * Verilog * SystemC * Perl * Tcl/Tk * Verification * Project
Services

Doulos Ltd. Church Hatch, 22 Market Place, Ringwood, Hampshire, BH24
1AW, UK
Tel: +44 (0)1425 471223 mail:
alan.fitch@doulos.com
Fax: +44 (0)1425 471573 Web:
http://www.doulos.com

The contents of this message may contain personal views which are not
the
views of Doulos Ltd., unless specifically stated.
 
On Wed, 4 Feb 2004 16:29:48 +1100, <dougs@dougs.com> wrote:

I have had to define a data type to deal with logarithmic values. It's
basically a real number ranging from -10000 to 10000. However, I would like
to use this user-defined data type in the entity of the device, i.e. given
the user-defined type is called llrValue, the architecture port would be

ENTITY sova_decoder IS
PORT (
Approiri : IN llrValue
)

Where do I define the data type such that it would be recognised once it
appears in the entity? Or is there some other way to do this?
Click to expand...
Define the type in a package, then "use" the package before the entity
declaration.

lib mylib;
use mylib.mypkg.all;

entity sova_decoder is
port (
Approiri : IN llrValue



Regards,
Allan.
 
cheers

"Alan Fitch" <alan.fitch@doulos.com> wrote in message
news:bvqcon$aqa$1$8300dec7@news.demon.co.uk...
dougs@dougs.com> wrote in message
news:bvpvpp$slu$1@tomahawk.unsw.edu.au...
I have had to define a data type to deal with logarithmic values.
It's
basically a real number ranging from -10000 to 10000. However, I
would like
to use this user-defined data type in the entity of the device, i.e.
given
the user-defined type is called llrValue, the architecture port
would be

ENTITY sova_decoder IS
PORT (
Approiri : IN llrValue
)

Where do I define the data type such that it would be recognised
once it
appears in the entity? Or is there some other way to do this?

You need to use a package, e.g.

package types is

subtype llrvalue is real range -10000.0 to 10000.0;

end;

Then if you compile it into the same library you are using for your
entity, it will appear in the current working library, so you can
say

use WORK.types.all;
entity sova_decoder is ...


regards

Alan

--
Alan Fitch
Consultant

DOULOS - Developing Design Know-how
VHDL * Verilog * SystemC * Perl * Tcl/Tk * Verification * Project
Services

Doulos Ltd. Church Hatch, 22 Market Place, Ringwood, Hampshire, BH24
1AW, UK
Tel: +44 (0)1425 471223 mail:
alan.fitch@doulos.com
Fax: +44 (0)1425 471573 Web:
http://www.doulos.com

The contents of this message may contain personal views which are not
the
views of Doulos Ltd., unless specifically stated.
Click to expand...
 
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