Problem with Fix_std

[Luca]

Hi people,

we are using this fix_std library, but we have a problem with the
assignament. If we use local variables, it works right... but if we use
global signals, the value doesn't change and remain "UUUU...".

Why?

Thanks to all!!!

Bye

 

[Ajeetha]

I believe you are referring to:

FIX_STD from:

http://www.doulos.com/knowhow/vhdl_designers_guide/models/fp_arith/

Can you show us your code that uses this pkg? Without it it is hard to
comment

Regards
Ajeetha, CVC
www.noveldv.com

Luca wrote:

Hi people,

we are using this fix_std library, but we have a problem with the
assignament. If we use local variables, it works right... but if we use
global signals, the value doesn't change and remain "UUUU...".

Why?

Thanks to all!!!

Bye

 

[Jonathan Bromley]

On 24 Nov 2006 02:45:11 -0800, "Luca" <you.writeme@gmail.com> wrote:

we are using this fix_std library, but we have a problem with the
assignament. If we use local variables, it works right... but if we use
global signals, the value doesn't change and remain "UUUU...".

hi Luca,

if you're talking about my fix_std package, downloaded from
doulos.com, then your best recommendation is: Don't.

I stopped work on it when the VHDL-200x standards group released
David Bishop's much more comprehensive packages. There are
several significant bugs in fix_std. The few people who used it in
the early days, and who kept in contact with me, were informed
about the worst of the bugs and given fixes. To be honest I
should have removed it completely from the website, but it was
never part of my core work and I'm sorry to say I haven't given
it any attention.

I'm not aware of any problem with fix_std that gives different
behaviour with variables and signals; if you post a code fragment
then perhaps we can try to comment, as Ajeetha said.

Thanks for the reminder; I'll take down the obsolete code from the
website as soon as I get back to the office next Thursday.
--
Jonathan Bromley, Consultant

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

Doulos Ltd., 22 Market Place, Ringwood, BH24 1AW, UK
jonathan.bromley@MYCOMPANY.com
http://www.MYCOMPANY.com

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