Viewing internal nets during Quartus functional simulation

I am trying to perform a functional simulation of a circuit
which contains a multiplier (LPM_MULT) feeding into a ram
cell (VHDL code).  Using the Node Finder, I have added the
output of the multiplier "mult:inst|result" to my .vwf file,
but I get the following warning message when I simulate:

Warning: Can't find node mult:inst|result[0] for functional
simulation. Ignored vector source file node.

I have read the question posed by Christos (10/9/2003), and
responded to by Subroto Datta (10/9/2003).

Since I am performing a functional simulation, and the Node
Finder can find the node of interest:

(1) Should the LCELL still be necessary?

(2) Why can't the node be found, is it stripped out when I
run the "Generate Functional Simulation Netlist" tool?

Regards,
Dalton

Well, I'm learning more as I go...  It seems that you have to
compile the design before you can use the Node Finder.  So I
added an LCELL between the multiplier and the ram, and named
it mult_out.  I can then add mult_out to my .vwf file and it
appears as it should in the output vectors, with the correct
waveforms.

Now if I can get the LCELL automagically stripped out when I
create the actual device...

Dalton Marris wrote:

> I am trying to perform a functional simulation of a circuit
> which contains a multiplier (LPM_MULT) feeding into a ram
> cell (VHDL code).  Using the Node Finder, I have added the
> output of the multiplier "mult:inst|result" to my .vwf file,
> but I get the following warning message when I simulate:
> 
> Warning: Can't find node mult:inst|result[0] for functional
> simulation. Ignored vector source file node.
> 
> I have read the question posed by Christos (10/9/2003), and
> responded to by Subroto Datta (10/9/2003).
> 
> Since I am performing a functional simulation, and the Node
> Finder can find the node of interest:
> 
> (1) Should the LCELL still be necessary?
> 
> (2) Why can't the node be found, is it stripped out when I
> run the "Generate Functional Simulation Netlist" tool?
> 
> Regards,
> Dalton

Hi,

"Dalton Marris" <dmarris@charter.net> wrote in message
news:10i7eeieh5tg452@corp.supernews.com...
> Well, I'm learning more as I go...  It seems that you have to
> compile the design before you can use the Node Finder.  So I
> added an LCELL between the multiplier and the ram, and named
> it mult_out.  I can then add mult_out to my .vwf file and it
> appears as it should in the output vectors, with the correct
> waveforms.
>
> Now if I can get the LCELL automagically stripped out when I
> create the actual device...

In my Quartus II ver. 4.0

Settings > Analysis & Synthesis > More Analysis & Synthesis Settings >
Ignore LCELL Buffers
set this to On (Default is off) and recompile..
If i remember correctly you will get a warning message that it synthesised
them away..

>
> Dalton Marris wrote:
>
> > I am trying to perform a functional simulation of a circuit
> > which contains a multiplier (LPM_MULT) feeding into a ram
> > cell (VHDL code).  Using the Node Finder, I have added the
> > output of the multiplier "mult:inst|result" to my .vwf file,
> > but I get the following warning message when I simulate:
> >
> > Warning: Can't find node mult:inst|result[0] for functional
> > simulation. Ignored vector source file node.
> >
> > I have read the question posed by Christos (10/9/2003), and
> > responded to by Subroto Datta (10/9/2003).
> >
> > Since I am performing a functional simulation, and the Node
> > Finder can find the node of interest:
> >
> > (1) Should the LCELL still be necessary?
> >
> > (2) Why can't the node be found, is it stripped out when I
> > run the "Generate Functional Simulation Netlist" tool?
> >
> > Regards,
> > Dalton


Good luck,

Christos

** christos zamantzas at cern dot ch **

Christos wrote:
> Hi,
> 
> "Dalton Marris" <dmarris@charter.net> wrote in message
> news:10i7eeieh5tg452@corp.supernews.com...
> 
>>Well, I'm learning more as I go...  It seems that you have to
>>compile the design before you can use the Node Finder.  So I
>>added an LCELL between the multiplier and the ram, and named
>>it mult_out.  I can then add mult_out to my .vwf file and it
>>appears as it should in the output vectors, with the correct
>>waveforms.
>>
>>Now if I can get the LCELL automagically stripped out when I
>>create the actual device...
> 
> 
> In my Quartus II ver. 4.0
> 
> Settings > Analysis & Synthesis > More Analysis & Synthesis Settings >
> Ignore LCELL Buffers
> set this to On (Default is off) and recompile..
> If i remember correctly you will get a warning message that it synthesised
> them away..
> 

Very good, found it in Quartus II ver. 4.1:

Assignments > Settings > Analysis & Synthesis Settings > More Settings > 
Ignore LCELL Buffers

("More Settings" is a button which opens the "More Analysis & Synthesis 
Settings" form.)

Now for some more reading and testing...

Thanks!

> 
>>Dalton Marris wrote:
>>
>>
>>>I am trying to perform a functional simulation of a circuit
>>>which contains a multiplier (LPM_MULT) feeding into a ram
>>>cell (VHDL code).  Using the Node Finder, I have added the
>>>output of the multiplier "mult:inst|result" to my .vwf file,
>>>but I get the following warning message when I simulate:
>>>
>>>Warning: Can't find node mult:inst|result[0] for functional
>>>simulation. Ignored vector source file node.
>>>
>>>I have read the question posed by Christos (10/9/2003), and
>>>responded to by Subroto Datta (10/9/2003).
>>>
>>>Since I am performing a functional simulation, and the Node
>>>Finder can find the node of interest:
>>>
>>>(1) Should the LCELL still be necessary?
>>>
>>>(2) Why can't the node be found, is it stripped out when I
>>>run the "Generate Functional Simulation Netlist" tool?
>>>
>>>Regards,
>>>Dalton
> 
> 
> 
> Good luck,
> 
> Christos
> 
> ** christos zamantzas at cern dot ch **