LEF file in mosis library?

[Lee]

Hi,

I have a mosis library, but I cannot find the LEF file in this
library. This library contains the cells (layout, abstract view and
....). Can I make the LEF file by myself for the existing
library?How?Thanks,

 

[Simon S. IBM]

yxl4444@louisiana.edu (Lee) wrote in message news:<5c3c88bc.0405060835.2898bff2@posting.google.com>...

Can I make the LEF file by myself for the existing
library?How?Thanks,

Sure. For the macro LEF, use the cadence abstract generator
(executable name is "abstract" strangely enough) in the DFII
bin directory in the later releases.

Big-time hint: Do NOT use the CIW menu selection:
File ... Export ... LEF
to generate macro lef. It works OK (barely) to generate
technology LEF (which will require much hand editing if the
P&R constructs are not yet in your dfii tech file); but it
won't generate good macro lef.

Yes, I know, you'd think that works. But, Cadence only puts
energy into the abstract generator (they use it for all their
tools, including the digital side) so it's the most powerful
abstract editor on the planet (and, of course, it reads DFII
data and outputs LEF on demand).

With the cadence abstract generator, you'll never need another
abgen tool ever again (once you learn how to use it).

Simon

 

[S. Badel]

yep, except when it crashes without any notice,
and despite the fact that it is incredibly slow.
Abgen wasn't that bad after all...

"Simon S. IBM" <cmos_nand_gate@yahoo.com> wrote in message
news:3520d403.0405090202.18ec89a5@posting.google.com...

yxl4444@louisiana.edu (Lee) wrote in message
news:<5c3c88bc.0405060835.2898bff2@posting.google.com>...
Can I make the LEF file by myself for the existing
library?How?Thanks,

Sure. For the macro LEF, use the cadence abstract generator
(executable name is "abstract" strangely enough) in the DFII
bin directory in the later releases.

Big-time hint: Do NOT use the CIW menu selection:
File ... Export ... LEF
to generate macro lef. It works OK (barely) to generate
technology LEF (which will require much hand editing if the
P&R constructs are not yet in your dfii tech file); but it
won't generate good macro lef.

Yes, I know, you'd think that works. But, Cadence only puts
energy into the abstract generator (they use it for all their
tools, including the digital side) so it's the most powerful
abstract editor on the planet (and, of course, it reads DFII
data and outputs LEF on demand).

With the cadence abstract generator, you'll never need another
abgen tool ever again (once you learn how to use it).

Simon

 

[Ronald]

Lee,

We have been using Cadence Envisia abstract generator (abstract) for
more than two years. It's powerful and good tool.
However you need to have DPUX file, gdsII file, and Verilog stub file.
I'm not sure if you have this DPUX file.

I notice that you have "abstract view" already. You could
actually generate the LEF file from Opus (File->Export->LEF) easily.

Simon's comment on bad LEF file using File->Export->LEF is valid for
layout view only.

FYI, abstract view is generated by feeding LEF file into Opus. You
just need to do the exact opposite step to get this LEF file.


thanks,
ronald



"S. Badel" <stephane.badel@epfl.ch> wrote in message news:<409f2da4$1@epflnews.epfl.ch>...

yep, except when it crashes without any notice,
and despite the fact that it is incredibly slow.
Abgen wasn't that bad after all...

"Simon S. IBM" <cmos_nand_gate@yahoo.com> wrote in message
news:3520d403.0405090202.18ec89a5@posting.google.com...
yxl4444@louisiana.edu (Lee) wrote in message
news:<5c3c88bc.0405060835.2898bff2@posting.google.com>...
Can I make the LEF file by myself for the existing
library?How?Thanks,

Sure. For the macro LEF, use the cadence abstract generator
(executable name is "abstract" strangely enough) in the DFII
bin directory in the later releases.

Big-time hint: Do NOT use the CIW menu selection:
File ... Export ... LEF
to generate macro lef. It works OK (barely) to generate
technology LEF (which will require much hand editing if the
P&R constructs are not yet in your dfii tech file); but it
won't generate good macro lef.

Yes, I know, you'd think that works. But, Cadence only puts
energy into the abstract generator (they use it for all their
tools, including the digital side) so it's the most powerful
abstract editor on the planet (and, of course, it reads DFII
data and outputs LEF on demand).

With the cadence abstract generator, you'll never need another
abgen tool ever again (once you learn how to use it).

Simon

 

[John Gianni]

rkdocc@yahoo.com (Ronald) wrote in message news:<f96c3977.0405101301.79f192e7@posting.google.com>...

I notice that you have "abstract view" already. You could
actually generate the LEF file from Opus (File->Export->LEF) easily.

Simon's comment on bad LEF file using File->Export->LEF is valid for
layout view only.

FYI, abstract view is generated by feeding LEF file into Opus. You
just need to do the exact opposite step to get this LEF file.

Everything Ron says above is correct.

For example:
If you already have a DFII abstract view (by whatever means),
you can successfully use File->Export->LEF to create the LEF
for the macro cells.

And, Ron mentions basically that these DFII abstract views are
often automatically generated when you import macro & technology
LEF into DFII (File->Import->LEF, if I remember correctly).

However, if you don't already have a DFII abstract view, nobody
suggests you try to create macro LEF using File->Export->LEF.
Everyone suggests you use the Cadence abstract editor (the
binary is named "abstract") to create macro LEF for DFII layout
cell views.

The only thing I'd add to in Ron's email is this statement:

However you need to have DPUX file, gdsII file, and Verilog stub file.
I'm not sure if you have this DPUX file.

The latest Cadence abstract generator can read almost any Cadence
database, including CDBA & OpenAccess (which are the most common
for DFII layout data); not just HLD DPUX data (which was the precurser
to Genesis & OpenAccess).

--
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