How to produce a parasitic netlist that you can simulate while using VIRTUAL CONNECT in the LVS and parasitic extraction flow.
Distributed parasitic extraction with Calibre xRC does not automatically connect multiple disjoint fragments of parasitic net models.
To produce a netlist that does not leave disjoint parasitic net model fragments unconnected:
In releases prior to v2009.1 use the environment variable:
setenv PEX_FMT_CHECK_NET_FRAGMENTS ON
In releases v2009.1 and following use the SVRF rule file statement:
PEX NETLIST VIRTUAL CONNECT YES
These settings look for disjoint fragments in a net model and connects them so that
the resulting RC tree structure of the parasitic net model is fully intact and can be simulated.
The connection between the disjoint parts of the RC parasitic net model is made with a small
resistor between the two nearest nodes on each of the disjoint segments of the net model.