STMicroelectronics 28nm CMOS SOI v2.5

[Apr 2015]

This is the latest version of the design kit for the STM 28nm SOI cmos process.

It is restricted to those who have access to the secret cluster of machines,
currently - "marconi", "popov", and "motala".

This design kit  can also be used by the  digital tools for synthesis.

The old version 2.4 should no longer be used.

Notes



Setup procedure

The environment is defined by a setup script which is called by the command

> source /usr/hidden/cmp/soi28v25/setup


The first time this is run, the script will also copy some files that are necessary for proper
function of the design kit. Afterwards the Cadence design tool can be started by

> virtuoso &


Connect new libraries to technology cmos32lp.

New Pad Library

The new pad library will be available for new users. Old ones have to add this line to their cds.lib file.

DEFINE LU_PADS /usr/hidden/cmp/LU_PADS

There is also a short description of the pads in the file ESD_Report.docx in the same directory.

Documentation

There is also an extensive set of maunuals which can be read by a browser which
is started by the command

> unidoc &

Some more can be found in  the library  $PDKITROOT/doc .


Simulation

Use Launch > ADE L to start the Simulation environment.

Be sure to fill in '$PDKITROOT/DATA/MODELS/SPECTRE/CORNERS/corners.scs' as Model File,
(Setup > Model Libraries), or copy it first if changes are to be made.

Then simulate normally.


Design Rule Check

Make sure it reads $U2DK_CALIBRE_DRC_DECK at Rules.

For Antenna checks use $U2DK_CALIBRE_ANTENNA_DRC_DECK instead.

Here is a file listing some errors that are acceptable since they will be fixed by tiling etc.

LVS

For LVS, make sure it reads '$PDKITROOT/DATA/LVS/CALIBRE/LVS_std' in the Rule File box. Do not forget
to tell LVS to export the schematic netlist.


Parasitic Extraction

In order to extract the parasitic components in the design a procedure that uses both Calibre and Cadence QRC
is used. It is shortly described in the first part of the file  $PDKITROOT/DATA/PEX/QRC/README .

This is how it goes.

Use Calibre to create a database, svdb.

Copy the file  $PDKITROOT/DATA/PEX/QRC/calibreqrc.ctrl  to your working directory. Replace "myCell"
with your own cellname. The layout and schematic are probably named something like this


LAYOUT PATH "lvsRunDir/cellname.calibre.db"

SOURCE PATH "lvsRunDir/cellname.src.net"

Execute with  calibre -hier -lvs calibreqrc.ctrl >& lvs_qrc.log

Use Calibre to convert the previously created database.

Copy the file  $PDKITROOT/DATA/PEX/QRC/calibreQRC.query.ctrl . Also create a new library, AGF.
Here is a lot of "myCell" to change.  Then run

calibre -query svdb < calibreQRC.query.ctrl >& calibre_ci.log

Time for extraction with Cadence QRC.

For help with QRC run  $QRC_HOME/tools/bin/cdnshelp .

Start by copying  $PDKITROOT/DATA/PEX/QRC/qrc.ccl  .Here is a lot to change. At the beginning
the extraction type is set ( rc_coupled, c_only_coupled...).

At the end, set the extraction corner (FuncCmax,  FuncCmin,  FuncRCmax, FuncRCmin, nominal).

Uncomment the section that deals with LVS to QRC flow. Make sure that cellnems and libraries are
set correctly.

Uncomment the section that generates the extracted view.

Now it is time to execute  qrc -cmd qrc.ccl >& qrc.log  

There should now be an av_extracted view of the cell in your library.


Slightly More Automatic Extraction

There is a primitive script that generates the command files and executes the three steps above. Please test
it by typing

$ST28SOI/xtract MyCell MyLib Ectraction_Type

MyCell : Cell Name
Mylib   : Library Name
Extraction_type : Type of Extraction Required, f.i. "c_only_coupled"

As usual anything can go wrong!