From: Charles Hixson <charleshixsn@earthlink.net>
Subject: Re: Disallowing Pre-Defined Operations
Date: 2000/03/17
Date: 2000-03-17T00:00:00+00:00 [thread overview]
Message-ID: <38D2ACA9.84FBD9F6@earthlink.net> (raw)
In-Reply-To: 38D2A073.A30FF041@cadence.com
Paul Graham wrote:
> Charles Hixson wrote:
> >
> > Re: Units:
> > mks? cgs? or English System? (And is a gallon an Imperial Gallon or a US
> > gallon?) Are angles measures in degrees, radians, or mils? (etc.)
>
> VHDL has a syntax for defining units for a given physical type. For
> instance:
>
> type distance is range integer'left to integer'right
> units angstrom;
> nm = 10 angstrom;
> mm = 1000_000 nm;
> inch = 25 mm;
> end units;
>
> Internally a value of a physical type is represented in terms of its
> base unit, in this case angstroms. This representation is obtained from
> the 'pos attribute. To convert from one unit to another (e.g., for
> display purposes) you can do:
>
> variable d : distance; -- vhdl declaration syntax
> variable d_inches : integer;
> variable d_mm : integer;
>
> d_inches := distance'pos(d) / distance'pos(1 inch);
> d_mm := distance'pos(d) / distance'pos(1 mm);
>
> It's also possible to combine different units of the same type:
>
> d := 3 mm + 4 inch + 2 angstrom;
>
> Paul
That would have saved at least one space probe. (By that here I mean the
automatic conversion of units.)
next prev parent reply other threads:[~2000-03-17 0:00 UTC|newest]
Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-03-10 0:00 Disallowing Pre-Defined Operations Charles H. Sampson
2000-03-09 0:00 ` Keith Thompson
2000-03-09 0:00 ` Samuel T. Harris
2000-03-12 0:00 ` Steven Hovater
2000-03-10 0:00 ` mark_biggar
2000-03-10 0:00 ` Jean-Pierre Rosen
2000-03-11 0:00 ` Tarjei Tj�stheim Jensen
2000-03-11 0:00 ` James S. Rogers
2000-03-13 0:00 ` Tarjei T. Jensen
2000-03-13 0:00 ` dmitry6243
2000-03-13 0:00 ` Robert Dewar
2000-03-13 0:00 ` Keith Thompson
2000-03-15 0:00 ` Robert Dewar
2000-03-15 0:00 ` Charles H. Sampson
2000-03-15 0:00 ` Robert Dewar
2000-03-21 0:00 ` Charles H. Sampson
2000-03-21 0:00 ` Robert A Duff
2000-03-21 0:00 ` Robert Dewar
2000-03-12 0:00 ` claveman
2000-03-12 0:00 ` Robert A Duff
2000-03-13 0:00 ` Tarjei T. Jensen
2000-03-13 0:00 ` Robert A Duff
2000-03-13 0:00 ` Robert Dewar
2000-03-15 0:00 ` Charles H. Sampson
2000-03-15 0:00 ` Tucker Taft
2000-03-15 0:00 ` Paul Graham
2000-03-16 0:00 ` Robert Dewar
2000-03-16 0:00 ` Charles Hixson
2000-03-17 0:00 ` Paul Graham
2000-03-17 0:00 ` Charles Hixson [this message]
2000-03-18 0:00 ` Robert Dewar
2000-03-20 0:00 ` Charles Hixson
2000-03-20 0:00 ` Robert Dewar
2000-03-16 0:00 ` Bryce Bardin
2000-03-16 0:00 ` Tarjei T. Jensen
2000-03-16 0:00 ` Dale Stanbrough
2000-03-16 0:00 ` mark_biggar
2000-03-17 0:00 ` Robert A Duff
2000-03-13 0:00 ` Ted Dennison
2000-03-14 0:00 ` Nick Roberts
2000-03-15 0:00 ` Robert Dewar
2000-03-17 0:00 ` William A Whitaker
2000-03-18 0:00 ` Robert Dewar
2000-03-22 0:00 ` William A Whitaker
2000-03-23 0:00 ` Robert Dewar
2000-04-06 0:00 ` Robert I. Eachus
2000-04-05 0:00 ` Marin D. Condic
2000-04-06 0:00 ` Robert Dewar
2000-04-06 0:00 ` Marin D. Condic
2000-04-07 0:00 ` dale
2000-04-07 0:00 ` Marin D. Condic
2000-04-07 0:00 ` Tarjei T. Jensen
2000-04-07 0:00 ` Marin D. Condic
2000-04-07 0:00 ` tmoran
2000-04-07 0:00 ` Marin D. Condic
2000-04-08 0:00 ` Vladimir Olensky
2000-04-08 0:00 ` Vladimir Olensky
2000-04-08 0:00 ` Dale Stanbrough
2000-04-10 0:00 ` Tarjei T. Jensen
2000-04-15 0:00 ` Niklas Holsti
2000-04-15 0:00 ` Marin D. Condic
2000-04-07 0:00 ` Robert Dewar
2000-04-07 0:00 ` Marin D. Condic
2000-04-09 0:00 ` Robert I. Eachus
2000-03-18 0:00 ` Robert Dewar
2000-03-18 0:00 ` Robert Dewar
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