Cadence 6.1 Setup

Cadence 6.15 Setup

This tutorial is designed to help students set up their accounts in order to run Cadence 6.15 with the NCSU Cadence Design Kit.

Setup

Once you have successfully logged into your account on a Linux machine, you need to take a few steps before you can start using the IC design tools. The following steps will only need to be perfromed once.

• Set Bash Shell for your account
  • Login to http://www.asw.iastate.edu
  • Click on: Manage user <net-id>
  • Select: "/bin/bash"
  • Click on: Update Shell
  • Click on: Logout
  • Note: These changes will take overnight to take effect. Until that time you will need to set your shell manually by typing bash at the command prompt. You will only need to do this for the first day and then your shell will default to the Bash Shell.

• Creat a .bashrc File

You will need to create a ~/.bashrc file which contains the following 3 lines:

if [ -f /etc/bashrc ]; then
   . /etc/bashrc
fi

• After making sure that these lines are present in the ~/.bashrc file, you need to source this file. You can do this by typing

source ~/.bashrc

• Create a ~/.software File
  • The Computer Support Group (CSG) has made a variety of software available for student use. To enable the use of different software tools, every user needs to have a special file, the .software file located in their home directory (i.e., ~/.software). Using a text editor of your choice, create the new file ~/.software and enter the following lines:

IC
MMSIM

These entries enable the use of the IC design tools with the Spectre circuit simulator. You will need to close your terminal and open a new terminal in order for these changes to take effect. If other tools are needed (i.e., tools for automatic place-and-route) you will have to edit this file and add the appropriate entreis as directed by your TA.

• Create a ~/.bash_profile File
  • Create a file named ~/.bash_profile and add the following lines to that file:

if [ -f ~/.bashrc ]; then
   . ~/.bashrc
fi

BASH_ENV=$HOME/.bashrc
USERNAME=""
export USERNAME BASH_ENV PATH DISPLAY

This file is where you will add any other types of customization to your shell, such as aliases etc.

New Project Setup

The following steps should be taken for every new project.

• Creat a Project Directory
  • It is best to organize your work into multiple directories with each directory being dedicated to a specific class or research project. We will create a new directory where all of our libraries will be stored. Type the following lines at the command line:

mkdir <proj dir>
cd <proj dir>

• You must now copy some Cadence configuration files into your newly created project directory. You will need to copy several files by typing the following commands at the prompt:

cp /remote/ncsu_oa/local/cdssetup/cdsenv ~/<proj dir>/.cdsenv
cp /remote/ncsu_oa/local/cdssetup/cdsinit ~/<proj dir>/.cdsinit
cp /remote/ncsu_oa/local/cdssetup/cds.lib ~/<proj dir>/cds.lib
cp /remote/ncsu_oa/local/cdssetup/display.drf ~/<proj dir>/display.drf

• You will need to edit your cds.lib file in order to add the analogLib. Using a text editor open the cds.lib file and add the following line:

DEFINE analogLib $IC/tools/dfII/etc/cdslib/artist/analogLib

• Finally, you need to edit the ~/<proj dir>/.cdsenv file. Using a text editor add the following lines under their respective heading to your .cdsenv file to set the default simulator as Spectre and set the correct model files (TSMC0.25um, TSMC0.35um, and AMI0.5um CMOS) for NCSU PDK. If there is an existing command of the same type, please alter the existing command.

;--------------------------------------------------------------------------
; Analog Artist Simulation Environment Defaults
; FORMAT: tool[.partition] varName type value private {choices, minmax} comment
;--------------------------------------------------------------------------
asimenv.startup       simulator       string  "spectre"

;--------------------------------------------------------------------------
; Graphics Editor and Design Editor Environment Variables
;--------------------------------------------------------------------------
graphic       drfPath string  "/usr/local/cadence/iclocal/local/cdssetup/display.drf"

;--------------------------------------------------------------------------
; spectre environment variables
;--------------------------------------------------------------------------
spectre.envOpts    modelFiles       string  "$CDK_DIR/models/spectre/standalone/tsmc25N.m \
                                             $CDK_DIR/models/spectre/standalone/tsmc25P.m \
                                             $CDK_DIR/models/spectre/standalone/tsmc35N.m \
                                             $CDK_DIR/models/spectre/standalone/tsmc35P.m \
                                             $CDK_DIR/models/spectre/standalone/ami06N.m \
                                             $CDK_DIR/models/spectre/standalone/ami06P.m"

spectre.envOpts controlMode string "batch"

You may also add the following script to setup the default directory to store simulation results.

asimenv.startup       projectDir      string  "~/cadence/simulation"

• You are now ready to run Cadence 6.15. You can invoke cadence using the following command:

virtuoso &