Correspondence between schematic and layout in Virtuoso

[Voom]

I have Virtuoso schematics, and corresponding layout views that were
created elsewhere. Next, I want to do schematic driven layout.

My main concern is making Virtuoso understand the correspondence
between the schematic designs.

When only the view names differ, the correspondence is
straightforward. For example, schematic libName/inv/schematic clearly
corresponds to layout libName/inv/layout.

Now, how do I establish the correspondence when there are two
different topologies for a single schematic? For example, for some
instances of libName/inv/schematic, the layout designer uses a tall,
narrow libName/inv_t/layout, and in other cases, uses a short, wide
libName/inv_w/layout. Of course both layouts contain identical
circuitry--they are just a different shape.

How do I tell Virtuoso that one instance of libName/inv/schematic has
layout libName/inv_t/layout, and another instance of libName/inv/
schematic has layout libName/inv_w/layout?

John McGehee
Voom, Inc.

 

[Jean-Marc Bourguet]

Voom <google@voom.net> writes:

I have Virtuoso schematics, and corresponding layout views that were
created elsewhere. Next, I want to do schematic driven layout.

My main concern is making Virtuoso understand the correspondence
between the schematic designs.

When only the view names differ, the correspondence is
straightforward. For example, schematic libName/inv/schematic clearly
corresponds to layout libName/inv/layout.

Now, how do I establish the correspondence when there are two
different topologies for a single schematic? For example, for some
instances of libName/inv/schematic, the layout designer uses a tall,
narrow libName/inv_t/layout, and in other cases, uses a short, wide
libName/inv_w/layout. Of course both layouts contain identical
circuitry--they are just a different shape.

How do I tell Virtuoso that one instance of libName/inv/schematic has
layout libName/inv_t/layout, and another instance of libName/inv/
schematic has layout libName/inv_w/layout?

For 6.1.X Look at the chapter "Configuring the Physical Hierarchy" in
doc/vxlhelp/vxlhep.pdf.

--
Jean-Marc

 

[Tim]

Hi John,

If you change the instanceName of the layout cells to match the
schematic but add a "|" pipe to the beginning the cells will match up
to the schematic. EX: schematic = M1 change layout to |M1

For connectivity to work the layout cell pin names must match the pin
names of the schematic symbols.

After doing this close the cell then reopen it in VXL and they should
now match.

Tim

 

[Andrew Beckett]

Tim wrote, on 03/24/10 14:12:

Hi John,

If you change the instanceName of the layout cells to match the
schematic but add a "|" pipe to the beginning the cells will match up
to the schematic. EX: schematic = M1 change layout to |M1

For connectivity to work the layout cell pin names must match the pin
names of the schematic symbols.

After doing this close the cell then reopen it in VXL and they should
now match.

Tim

Note however that if you're using IC61 (especially IC614), there's no need to
have the instance names matching. The binder in IC61 is net-based rather than
instance-based. IC614 has an "incremental" binder which is very good at handling
chunks of things that have been done outside of the normal VLS XL flow, and is
good at supporting copy and create instance within VLS XL, as well as edits done
in VLS L - without needing to do messing around with setting device correspondence.

Regards,

Andrew.