Viewing internal nets during Quartus functional simulation

D

Dalton Marris

Guest
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
Click to expand...
 
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...
Click to expand...
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
Click to expand...

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..
Click to expand...
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 **
Click to expand...
 
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