Cadence Simvision question

[xiaobin]

Hi, All:

I am using cadence simvision to view the simulation waveforms. The code is
fine through ncvhdl, ncelab and ncsim. But, after selecting the signals, i
open the waveform window, there is a pop-up which says

"object must have read access"

and then, I can not see the selected signals in simvision!

Anybody know how to handle with this problem? Appreciate any help!

Best,

-/X

[Eyck Jentzsch]

ncsim run in 'performance mode' out of the box. This means that any
possible optimization is active. One of the is to remove access rights
to signals. You can change that by adding the switch -access rwc, where
'r' stands for read (probing), 'w' for writing (forces) and 'c' for
callback (allowing external C functions to wait on signalchange). In
your case '-access r' should be sufficient.
HTH

-Eyck

[Jonathan Bromley]

On Thu, 18 Mar 2004 14:12:06 -0800, "xiaobin"
<xiaob...@hotmail.com> wrote:

>I am using cadence simvision to view the simulation waveforms. The code is
>fine through ncvhdl, ncelab and ncsim. But, after selecting the signals, i
>open the waveform window, there is a pop-up which says
>
>"object must have read access"
>
>
>and then, I can not see the selected signals in simvision!

Make sure you use the correct options to ncvhdl and ncelab.

ncvhdl -linedebug ...
ncelab -access +rwc ...

will enable full visibility of everything, which is great for
debug but limits the optimisations that the simulator can do;
consequently it makes large simulations run slower.

If you only need to see simple signals in the waveform viewer,

ncelab -access +r

is adequate.

Read the online help!
--
Jonathan Bromley, Consultant

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

Doulos Ltd. Church Hatch, 22 Market Place, Ringwood, BH24 1AW, UK
Tel: +44 (0)1425 471223 mail:jonathan...@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.

[Alan Fitch]

"xiaobin" <xiaob...@hotmail.com> wrote in message
news:c3d6go$ibj$1...@news.service.uci.edu...

> Hi, All:
>
> I am using cadence simvision to view the simulation waveforms. The
code is
> fine through ncvhdl, ncelab and ncsim. But, after selecting the
signals, i
> open the waveform window, there is a pop-up which says
>
> "object must have read access"
>
>
> and then, I can not see the selected signals in simvision!
>

You have to specify the access during the elaboration using
the option

ncelab -access +rwc

You might also want to make sure you specify -linedebug
for compilation as well, e.g.

ncvhdl -mess -linedebug

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....@doulos.com

[purs...@gmail.com]

Thanks for your info. It really helped