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Simulators >> AMS Simulators >> NCelab error: unresolved instance
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Message started by Cri Azzolini on May 8^th, 2006, 9:24am

Title: NCelab error: unresolved instance
Post by Cri Azzolini on May 8^th, 2006, 9:24am

Hi all!

I am trying to simulate a circuit with Cadence AMS-Designer; the DesigPrep phase goes well (neither warning nor errors) but when I launch "Run Simulation" from the AMS-plugin menu of the Cadence Hierarchy Editor, I have got:

ncelab: *E,CUCFUN (no HDL source, 0|0): istance 'I15' of the unit <my_cell_A> is uresolved in <my_library.my_cell_B.schematic>

The log file ncelab.log consulted by means of the Cadene NCBrowse provide the following explanation:

"The specified instance in the named module could not be resolved using the 5.x configuration specification available"

Actually I can not fix this error since I do not undestand what the "5.x config specification" is!
May anyone help me?

Is there a exaustive manual for all the NCelab warnings/errors? I was not able to find it in the CDSdoc hierarchy ....

Thanks and bye,
Cri

Title: Re: NCelab error: unresolved instance
Post by bernd on May 8^th, 2006, 9:44am

Try to create an explicit *.vams netlist for
your cell <my_library.my_cell_B.schematic>,
e.g. with 'CIW->Tools->AMS->Netlist...'.

The retry the 'Design Prep...' & 'Run Simulation...'
steps.

Bernd

Title: Re: NCelab error: unresolved instance
Post by Cri Azzolini on May 8^th, 2006, 10:04am

Thanks Bernd,

it seems to work! Thanks!
Now I have to netlist a lot of blocks since the error I posted is repeated for many istances.

Thanks again and bye,
Cri

Title: Re: NCelab error: unresolved instance
Post by bernd on May 9^th, 2006, 12:56am

Quote:

Now I have to netlist a lot of blocks since the error I posted is repeated for many instances.

This should not be the case, maybe it helps if you put 'my_library' into
the Hierarchy Editors Global Bindings Library List and then do a Design Prep
again, this is just an assumption.

But you can always create a AMS netlist for your schematic if you modify
your Check & Save options, CIW->Tools->AMS->Options..., 'Check and Save',
enable 'Generate AMS netlist' there.

Bernd

Title: Re: NCelab error: unresolved instance
Post by Cri Azzolini on May 9^th, 2006, 1:32am

Thanks for your time, Bernd: I am happy to find a great expert on this field! On the contrary, I am at the very beginning of mixed-mode simulation.

As far as I can see, I found a little but significative difference between the analog flow (Analog Design Environment -> Spectre -> Calculator -> Waveform Window AWD) and the AMS-Designer flow suggested by the Tutorial (Hierarchy Editor -> NCsim -> SimVision for result display): in SimVision, before starting the mixed-mode simulation, I have to choose the signal I am interested to and to add them to the SimVision waveform display. Then the simulation is started and the result are dislayed: it happens to me that if I add a signal (not previously chosen) to the wavform strips, no data are available and the signal is not displayed! This is very frustrating since for large circuits, you cannot always forecast which signal you need to check, especially if the circuit does not work properly and a debug is needed!
In your experience, is it possibile to add signal to the SimVision waveform strip once the simulation is finished or are only the previously chosen signal saved?

Thanks again and bye,
Cri

Title: Re: NCelab error: unresolved instance
Post by bernd on May 9^th, 2006, 2:34am

Quote:

In your experience, is it possible to add signal to the SimVision waveform strip once the simulation is finished or are only the previously chosen signal saved

No not as far as I know.

But you can also use AMS out of the Analog Design Environment
if you use the most recent Cadence versions/updates
of NC-sim (IUS stream) and DFII (IC stream) optional MMSIM stream,
but don't ask me for exact version numbers.
Can you see 'ams' in your simulator choices in the Analog Design Environment?

Quote:

I am happy to find a great expert on this field!

Thanks for the laurels, but I'm just started 2 month ago
to set up the AMS stuff for my company. That's why I
know most of the traps, because I'm steeped in already.

Bernd