Use clause usage with XST?

Hi,
When I heavily make use of a package in a particular source file, I use
the following syntax:

library work;
use work.PkgMisc.all;

....and then happily use anything declared in the package.

But recently I had a situation where I only wanted to use a few things
from a package. According to the "The designers guide to VHDL,
Ashenden", I can do the following:

library work;
use work.PkgMisc; -- no all suffix

then when I come to use specific items from the package:

variable MyVbl : PkgMisc.MyVbl_type;

I like the idea of this syntax when I'm not heavily using the package,
it makes it immediately obvious to the reader where the defintion of
MyVbl_type is located. However, XST gives me this error when I try to
use something from the package:

ERROR:HDLParsers:1217 - "C:/project/.../Src/PcmRxInterface.vhd" Line
167. Symbol PkgMisc can't be used as a prefix in a selected name.

Is there an error in my syntax I'm missing? Does XST support this usage
of the USE clause? Has anyone sucessfully done this before?

Regards
Andrew

Andrew FPGA

Von Andrew FPGA:

> When I heavily make use of a package in a particular source file, I use
> the following syntax:
>
> library work;
> use work.PkgMisc.all;
>
> ...and then happily use anything declared in the package.
>
> But recently I had a situation where I only wanted to use a few things
> from a package. According to the "The designers guide to VHDL,
> Ashenden", I can do the following:
>
> library work;
> use work.PkgMisc; -- no all suffix
>
> then when I come to use specific items from the package:
>
> variable MyVbl : PkgMisc.MyVbl_type;
>
> I like the idea of this syntax when I'm not heavily using the package,
> it makes it immediately obvious to the reader where the defintion of
> MyVbl_type is located. However, XST gives me this error when I try to
> use something from the package:
>
> ERROR:HDLParsers:1217 - "C:/project/.../Src/PcmRxInterface.vhd" Line
> 167. Symbol PkgMisc can't be used as a prefix in a selected name.
>
> Is there an error in my syntax I'm missing? Does XST support this usage
> of the USE clause? Has anyone sucessfully done this before?

use work.PkgMisc.MyVbl_type;
....
variable MyVbl: MyVbl_type;

HTH

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