Virtuoso XL Update Device Correspondence

[Erik Wanta]

Note: Use the Connectivity - Update - Device Correspondence command
with designs that are not LVS correct and have been created using
Virtuoso XL. Use the Create - Device Correspondence command for LVS
correct designs that have not been created using Virtuoso XL.

Does the Create Device Correspondence command use the LVS results at
all? If so, does it use Diva or Assura results. One would think that
there would be a way to use the LVS mappings to make the layout VXL
compatible.

---
Erik

 

[Ethan Dawe]

"Erik Wanta" <erikwanta@starband.net> wrote in message
news:84018314.0310271208.6f259733@posting.google.com...

Note: Use the Connectivity - Update - Device Correspondence command
with designs that are not LVS correct and have been created using
Virtuoso XL. Use the Create - Device Correspondence command for LVS
correct designs that have not been created using Virtuoso XL.

Does the Create Device Correspondence command use the LVS results at
all? If so, does it use Diva or Assura results. One would think that
there would be a way to use the LVS mappings to make the layout VXL
compatible.

---
Erik

Hi Erik,

All this allows you to do is to manually create a correspondence between a
layout component and a schematic component for VXL. This will then allow you
to use VXL to make updates/changes. It doesn't use the LVS data in either
case.

It's important to note that VXL can easily become confused with its
connectivity and correspondence, especially if you break up devices into
smaller pieces or accidently create a short. If the connectivity to a
particular devices looks wrong, don't waste too much time with it. Either
hook it as you think it should be and run LVS, or re-create the component
from the linked schematic!

Ethan

 

[Erik Wanta]

"Ethan Dawe" <ethan.dawe@gcdchips.com> wrote in message news:<16WdnckhBr0QQQCiRVn-jA@metrocast.net>...

"Erik Wanta" <erikwanta@starband.net> wrote in message
news:84018314.0310271208.6f259733@posting.google.com...
Note: Use the Connectivity - Update - Device Correspondence command
with designs that are not LVS correct and have been created using
Virtuoso XL. Use the Create - Device Correspondence command for LVS
correct designs that have not been created using Virtuoso XL.

Does the Create Device Correspondence command use the LVS results at
all? If so, does it use Diva or Assura results. One would think that
there would be a way to use the LVS mappings to make the layout VXL
compatible.

---
Erik

Hi Erik,

All this allows you to do is to manually create a correspondence between a
layout component and a schematic component for VXL. This will then allow you
to use VXL to make updates/changes. It doesn't use the LVS data in either
case.

It's important to note that VXL can easily become confused with its
connectivity and correspondence, especially if you break up devices into
smaller pieces or accidently create a short. If the connectivity to a
particular devices looks wrong, don't waste too much time with it. Either
hook it as you think it should be and run LVS, or re-create the component
from the linked schematic!

Ethan

Ethan:
We have a situation where we reuse old layouts that may or may not
have been done with layoutXL. We really like layoutXL and would like
to use it on the layout being reused. I would be nice if there was a
way to make the layout XL compatible. I have found this to be
difficult with create device correspondence and update device
correspondence. One would think that the LVS device mappings could be
used to rename the layout instance names and make the layoutXL
compatible.
---
Erik

 

[Andrew Beckett]

Erik,

You might think that they could be used, but at the moment they can't. It's probably
not as simple as it might at first seem, because most verification tools would work
by identifying the polygons which form the devices, and finding the correspondence
at that level - not by starting from any existing pcells and finding the correspondence
there. In other words, they extract the devices and connectivity from the raw
shapes, not the pcells - and so to get the devices mapped back into VXL, it
would have to re-identify the components from which the shapes that the
verification tool used to form the devices. Nothing impossible here, but it's not
as straightforward as it might first seem - certainly not as simple as just
taking the device mappings directly.

Andew.

On 28 Oct 2003 08:07:01 -0800, erikwanta@starband.net (Erik Wanta) wrote:

Ethan:
We have a situation where we reuse old layouts that may or may not
have been done with layoutXL. We really like layoutXL and would like
to use it on the layout being reused. I would be nice if there was a
way to make the layout XL compatible. I have found this to be
difficult with create device correspondence and update device
correspondence. One would think that the LVS device mappings could be
used to rename the layout instance names and make the layoutXL
compatible.
---
Erik

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