RE: [vhdl-200x-ft] to_string (time, resolution) problem

Dave,

You can use time'pos(value) to get the number of primary units in a time
value. The result is of type universal_integer. It doesn't get around the
problem of exceeding the representable range of universal_integer, but it
does avoid using "/".

Cheers,

PA

--
Dr. Peter J. Ashenden                        peter@ashenden.com.au
Ashenden Designs Pty. Ltd.                   www.ashenden.com.au
PO Box 640                                   Ph:  +61 8 8339 7532
Stirling, SA 5152                            Fax: +61 8 8339 2616
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> -----Original Message-----
> From: owner-vhdl-200x-ft@eda.org 
> [mailto:owner-vhdl-200x-ft@eda.org] On Behalf Of David Bishop
> Sent: Tuesday, 28 September 2004 05:48
> To: vhdl-200x-ft@eda.org
> Subject: [vhdl-200x-ft] to_string (time, resolution) problem
> 
> 
> I was playing around with the to_string function:
> 
>    function to_string (
>      VALUE     : in TIME;
>      JUSTIFIED : in SIDE  := right;
>      FIELD     : in WIDTH := 0;
>      resolution : in TIME := Sim_Resolution
>      ) return STRING;
> 
> and looking into implementations.
> 
> In the LRM, there is only one way to get "time" into any 
> other format: function "/" (anonymous, anonymous: TIME) 
> return universal_integer;
> 
> Since 1 hr / 1 fs > integer'high there is no way I can do 
> this, because I need to use "real" math to manipulate the number.
> 
> Can I recommend that we drop this one and go back to:
>    function to_string (
>      VALUE     : in TIME;
>      JUSTIFIED : in SIDE  := right;
>      FIELD     : in WIDTH := 0
>      ) return STRING;
> 
> Though I like the idea of the deferred constant 
> "sim_resolution". It gives you something to check in your 
> testbenches to make sure that you have the correct simulation 
> resolution set.
> 
> If somebody comes up with a clever idea, we can always 
> revisit it later.
> 
> -- 
> David W. Bishop dbishop@vhdl.org       All standard disclaimers apply.
>