nport and layout LVS

Hello,

My schematic has many n2port components that I'm using to import
s-param for different things. My question is how can I avoid LVS errors
while generating my layout through XL editor (pcells)? As it currently
stands the layout won't match the schematic because of those n2port
components. This is a specific case but in general how can you tell
LVS to ignore part of the schematic, etc? Hopefully someone knows what
to do here. Thanks

-Mike

 

[Erik Wanta]

Mike:
Add a property called lvsIgnore to the n2port in the schematic. Note
its type is boolean and set it to t. I don't know why this isn't
already set for the components in analogLib.
---
Erik

 

Hi Erik,

Thanks for the reply. I'm basically ADS guy and don't know too much
about Cadence. What do you mean by 'adding a property called
lvsIgnore'? How do I add a property manually for a component? Also,
exactly what's this lvsIgnore doing? Meaning, I have a node(1) that
connects to n2port and the output/other side node(2) connects to a
resistor; would LVS still know that the node(1) wire through something
(n2port thing) should connect to the resistor? I don't know if the
question is making any sense. At least please let me know how to add
that lvsIgnore property. Thanks

-Mike

 

Hi,

Sorry I asked the question before looking into it. I found out how to
add property but after I set the type to boolean it didn't provide a
textbox to enter value 't'. Any suggestions??

-Mike

 

[Andrew Beckett]

On 25 Feb 2006 10:41:18 -0800, mxkdirs@yahoo.com wrote:

Hi,

Sorry I asked the question before looking into it. I found out how to
add property but after I set the type to boolean it didn't provide a
textbox to enter value 't'. Any suggestions??

-Mike

If you make it boolean, you can just turn on the checkbox that is shown. That is
setting the value t but in a more graphical way...

Andrew.

 

[Erik Wanta]

Mike:
By adding the lvsIgnore property this instance will be ignored totally
and won't show up in the schematic netlist used for LVS. If you still
want LVS to netlist the connectivity I would recommend creating a
schematic_lvs view for the n2port and connect your ports with metal
resistors or cds_alias components.
---
Erik