GlobalNets in Sch Cell

[sampath]

Hi,
I am trying to find the global nets that are present in a schematic cell
view with several levels of hierarchy. is there any easy way to do
this?. As globals can be defined any where in hierarchy we cannot find
them in the list of toplevel schematic nets.Right now, I am traversing
entire schematic hierarchy and looking for signalNames which contain "!".
Thanks
Sampath

 

[Andrew Beckett]

That's pretty much what you have to do. It doesn't keep these on the top level,
because exactly which globals are used depends on the particular view switching
that is done - so you could change the view list and it would change the
globals. Or you could be using a config, and it would change.

So you need to traverse the hierarchy, and collect them. Strictly speaking,
the right thing to do is look for signals in each cellView which have the
isGlobal attribute set to t. signal names ending in "!" is just a convention
that the schematic checker uses to identify signals which it should set the
isGlobal attribute on.

Andrew.


On Fri, 12 Dec 2003 14:39:58 -0700, sampath <sdechu@micron.com> wrote:

Hi,
I am trying to find the global nets that are present in a schematic cell
view with several levels of hierarchy. is there any easy way to do
this?. As globals can be defined any where in hierarchy we cannot find
them in the list of toplevel schematic nets.Right now, I am traversing
entire schematic hierarchy and looking for signalNames which contain "!".
Thanks
Sampath

--
Andrew Beckett
Senior Technical Leader
Custom IC Solutions
Cadence Design Systems Ltd