Virtuoso extraction to Hspice netlist etc.

[Vani]

hello!

I had two queries regarding cadence layout extraction:
can u pls help me out with this ASAP, since i have some impending
deadlines..

1. can we obtain a Hspice netlist from the extracted layout (virtuoso)?

2. when i extract the netlist (.18um tech) i get
model r = 2.75
instead of
resistance r= 2.75

capacitance gets xtracted properly when i create the netlist in analog
environ.


so i checked the property in the extracted view which shows a resistance
as
a "resistor". hence extraction was proper. but somehow the name is
getting
changed to "model" when i put it for simulation.

Hence, i tried changing the model file (for simulation) where i replaced
all
resistors by "model" but the error remains. the simulator cannot
recognize
the name "model".

i wanted to know if i can edit the netlist somehow to do Find --> Replace
for "model --> resistance", and feed it back to spectre to get rid of the
problem.

can u pls let me know?

thanks and regards
Vani

 

[Diva Physical Verificatio]

On Tue, 24 May 2005 10:25:29 -0400, "Vani" <vani@ee.iitb.ac.in> wrote:

hello!

I had two queries regarding cadence layout extraction:
can u pls help me out with this ASAP, since i have some impending
deadlines..

1. can we obtain a Hspice netlist from the extracted layout (virtuoso)?

2. when i extract the netlist (.18um tech) i get
model r = 2.75
instead of
resistance r= 2.75

capacitance gets xtracted properly when i create the netlist in analog
environ.


so i checked the property in the extracted view which shows a resistance
as
a "resistor". hence extraction was proper. but somehow the name is
getting
changed to "model" when i put it for simulation.

Hence, i tried changing the model file (for simulation) where i replaced
all
resistors by "model" but the error remains. the simulator cannot
recognize
the name "model".

i wanted to know if i can edit the netlist somehow to do Find --> Replace
for "model --> resistance", and feed it back to spectre to get rid of the
problem.

can u pls let me know?

thanks and regards
Vani

For your question 1), the answer is yes. A Diva extracted view is a
essentially a schematic. It can be netlisted for any tool that works
with a schematic, as long as the netlisting form allows you to specify a
view name.

Your question 2) is better answered by someone else, but I would look at
the NLP globals for the cause. Or the NLP expressions for spectre might
be on the spectre view itself instead of the globals. I think the OSS
documentation describes NLP expressions.

 

[Svenn Are Bjerkem]

Vani wrote:

2. when i extract the netlist (.18um tech) i get
model r = 2.75
instead of
resistance r= 2.75

What is the componentName CDS property of the hspice viewName of your
resistor? What happens if you set it to "resistor" in the base property.

--
Svenn

 

[Vani]

extracted properties:

cell name: presistor (corr. to tsmc 0.18um tech file)

and model name: resistor

pls note that i am clueless about how to
extract the parameters into a Hspice netlist
directly...

hence i can solve my problem in two ways
1) getting a full hspice netlist
OR
2) modifying the netlist in cadence itself

so that the word "model" is replaced by
"resistor" in the netlist.

 

[Svenn Are Bjerkem]

Vani wrote:

extracted properties:

cell name: presistor (corr. to tsmc 0.18um tech file)

and model name: resistor

pls note that i am clueless about how to
extract the parameters into a Hspice netlist
directly...

hence i can solve my problem in two ways
1) getting a full hspice netlist
OR
2) modifying the netlist in cadence itself

so that the word "model" is replaced by
"resistor" in the netlist.

What I try to make you do is to check the CDF properties of the cell
view presistor. If this has the componentName set to "model" then it is
no problem to change that "model" to "resistor" and re-netlist. The
problem is that I do not understand what you are saying above. I only
have the suspision that something is wrong with the hspice simulator CDF
description of your setup. Use CIW->Tools->CDF->edit, scroll down to
Simulator Information and check.

--
Svenn