| Author |
Message |
Ranjith
Guest
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 Posted:
Tue Feb 08, 2005 5:36 am Post subject:
Problem with netlist extraction in Mentor Graphics |
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Hello Everyone,
I am facing a problem with extracting the netlist from the mentor
graphics. I am using IC station to build my layout (currently having an
inverter with a signal conditioner and load). When I extract the
netlist using PEX, I get the following
(Only a part of it is shown below)
-------------------------------
mM0 IN IN1 VDD VDD P L=4e-07 W=1.8e-06 AD=2.16e-12 AS=2.16e-12 PD=6e-06
+ PS=6e-06 NRD=0.222222 NRS=0.222222
mM1 OUT IN VDD VDD P L=4e-07 W=1.8e-06 AD=2.16e-12 AS=2.16e-12 PD=6e-06
+ PS=6e-06 NRD=0.222222 NRS=0.222222
mM2 OUT2 OUT VDD VDD P L=4e-07 W=1.8e-06 AD=2.16e-12 AS=2.16e-12
PD=6e-06
+ PS=6e-06 NRD=0.222222 NRS=0.222222
mM3 IN IN1 GND GND N L=4e-07 W=1.2e-06 AD=1.44e-12 AS=1.44e-12
PD=4.8e-06
+ PS=4.8e-06 NRD=0.333333 NRS=0.333333
mM4 OUT IN GND GND N L=4e-07 W=1.2e-06 AD=1.44e-12 AS=1.44e-12
PD=4.8e-06
+ PS=4.8e-06 NRD=0.333333 NRS=0.333333
mM5 OUT2 OUT GND GND N L=4e-07 W=1.2e-06 AD=1.44e-12 AS=1.44e-12
PD=4.8e-06
+ PS=4.8e-06 NRD=0.333333 NRS=0.333333
c_1 1 0 1.1728f
c_2 2 0 2.1136f
c_3 3 0 2.1136f
c_4 4 0 3.0023f
c_5 5 0 3.0537f
c_6 6 0 0.7216f
---------------------------------
In the layout I had 4 ports namely IN, IN1, OUT, OUT2.
IN and OUT are the ports of the inverter under consideration.
IN1 is the input to the signal conditioner
OUT2 is the output at the load.
(Signal conditioner and load are similar inverters)
You can see from the netlist, that the capacitors are given as between
1 & 0, 2 & 0 and so on. Its not saying between which ports and ground
or another port with naming them as IN, IN1 etc.
-----------------------------------
When I run "eldo" it gives me these warnings:
Warning 112: NODE "1": Connected to grounded capacitors only.
This node has been removed from the netlist.
Warning 112: NODE "2": Connected to grounded capacitors only.
This node has been removed from the netlist.
Warning 112: NODE "3": Connected to grounded capacitors only.
This node has been removed from the netlist.
Warning 29: Set .option MSGNODE = 0 to receive all such warnings.
------------------------------------
I suspect that the netlist generated has the errors (which might be due
to the layout, I am not sure about this). If the Ports are mentioned in
the netlist for capacitors, these warnings wont appear. Can anyone help
me why it is generating this way?
Thanks in Advance,
Ranjith
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Ranjith
Guest
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| Posted:
Tue Feb 08, 2005 8:41 am Post subject:
Re: Problem with netlist extraction in Mentor Graphics |
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Since this is the layout I am starting with (a simple one), I can do
this manually. What will happen when i have to do this for a huge
circuit? |
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Chaos Master
Guest
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| Posted:
Tue Feb 08, 2005 8:41 am Post subject:
Re: Problem with netlist extraction in Mentor Graphics |
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This is Ranjith for forever:
| Quote: | ------------------------------------
I suspect that the netlist generated has the errors (which might be due
to the layout, I am not sure about this). If the Ports are mentioned in
the netlist for capacitors, these warnings wont appear. Can anyone help
me why it is generating this way?
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I think the netlist generator doesn't "see" the node _names_ and connect
the capacitors to a node _number_.
If you can edit the output netlist manually, you may wish to change the
node names of capacitors.
[]s
--
Chaos Master®, posting from Canoas, Rio Grande do Sul, Brazil - 29.55° S
/ 51.11° W / GMT-2h / 15m .
"People told me I can't dress like a fairy.
I say, I'm in a rock band and I can do what the hell I want!"
-- Amy Lee
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