Tutorial on device generation using infinity

Venkates

Informations

• Publié par: Lomif
• Nombre de lectures: 12
• Langue: English

Extrait

Tutorial on device generation using infinity

Setting up ‘igm’ infinity generator module

•

Make directory for infinity

mkdir infinity

•

Move to the dirctory

cd infinity

•

Copy the file igm from /home/venkates/setups/

cp /home/venkates/setups/igm

~/infinity/.

Now you are set up to run infinity device generator

Create individual devices

Goto infinity directory

lab1-12> cd infinity

lab1-12> /infinity>./igm

This opens up a window that looks like

This window is the main window of the device generator. From this window you

can create devices, get help regarding usage and report bugs and questions.

In this window you will find a pull down menu ‘Choose Device’. Pull down the

menu and select the device you want to create and hit

OK.

This will pop up another window corresponding to the device you want to create.

If you have selected the wrong device hit cancel.

More information on each device can be found at

www.eng.utah.edu/~venkates/Infinity.html

After you have specified parameters for each of the devices hit OK and this would pop up

a window

This means that your device generation has been successful. On successful

completion you will find the file named output.cif in your infinity directory. This gives

the layout of the device in a Caltech Intermediate Format (CIF). This is one of the most

popular formats used for representing layouts. This file can be imported into cadence

using the stream in process.

Importing layout into cadence:

o

The stream in/out process is not supported in the cadence 4.4.5 that we are using

for the class. We have to use cadence 5.0.0 for this purpose. You can run you

normal simulations and all other designs from cadence 5.0.0. Both versions of

cadence are essentially the same but for a few feature enhancements.

o

To start up cadence source the file in /home/venkates/setups/ncsu.cshrc

•

source /home/venkates/setups/ncsu.cshrc

Important

: You will have to source this file any time you want to import file to

cadence.

Then start cadence as you normally do.

Connect to your cadence directory in case you are not in there

>cd ~/cadence5720

>icfb

This will open the cadence 5.0.0

You will need to create a cell for targeting the created layout. In the library manger go to

file > new > create > cell view and name the cell ‘area’ for layout.

Library name:

your class library

Cell name:

area

View name:

layout

Tool:

virtuoso

Click save and exit the virtuoso window. We will import our design into this cellview.

You need to do this only for the first time. You can use the same cell again.

Now we will import the file into cadence

In the CIW window

Select file > Import > CIF

Cadence supports various file formats for layout, schematic and netlists. GDS and CIF

are two popular formats for layout representation. We are using the CIF format for

infinity.

Selecting the CIF ... opens up a window

Fill in the following values

Run directory:

~/cadence5720

(your default cadence directory)

Input file :

~/infinity/output.cif

(layout file you created)

Top Cell name :

area

(this is the cell name you have created in cadence)

Ouptut :

opus DB

Library name :

csee5720

(library that contains the cell area)

Leave all others to default values.

Hit

OK

On successful import you will see a popup up window that says PIPO CIF IN completed.

Your CIW window should display the above message.

If you get a fatal error or data translation error, then check if you are importing the correct

file and check you file path . Or else the device parameters that you have entered are not

feasible to be created by infinity (i.e) device sizes are too small or to large.

Now from the library manager open the cell named area and view layout. This will have

the layout of the device you have created.

Copy this layout into by selecting the layout fragment and copying it. You can use

shortcut ‘c’ to copy the layout or use edit> copy and paste in the file you would like to.

In the same way all the devices can be generated and copied to your design and

routed to get your final layout.

Good luck for your Project!