VLSI

Group_path

NAME
group_path
Groups a set of paths for cost function calculations.

ARGUMENTS

   -weight weight_value
          Specifies   a   cost   function  weight  for  this  group.   The
          weight_value must be  a  number  between  0.0  and  100.0.   The
          default  is  1.0.   A weight of 0.0 eliminates the paths in this
          group from cost function calculations.  Do not  use  very  small
          values (for example, 0.0001); smaller values can prevent compile
          from implementing small improvements  to  the  design.   If  you
          specify  -weight  when you add members to an existing group, the
          new weight for the group is used.

   -critical_range range_value
          Specifies a margin of delay for group_name during  optimization.
          The  range_value must be positive or 0.0.  If you do not specify
          a range_value for a group, the default is the value set with the
          set_critical_range  command  (the  default  setting  is 0.0).  A
          range_value of 0.0 means that only the most critical paths  (the
          ones  with the worst violation) are optimized.  If you specify a
          nonzero range_value, other near-critical  violating  paths  (one
          per  endpoint)  within  that  amount  of the worst path are also
          optimized if possible.  If more than one  critical  path  to  an
          endpoint  must  be  optimized, use a separate group_path command
          for each distinct critical path to that endpoint.  To force com-
          pile   to  optimize  all  violating  paths,  use  a  very  large
          range_value (larger than any expected path violations).

   -default
          Specifies that endpoints or paths be moved to the default  group
          and  removed  from the current group.  You must specify -default
          unless you use -name; -name and -default are mutually exclusive.

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VLSI

Verdi Configuration File novas.rc

When Novas Verdi is invoked, the Rule Configuration file novas.rc is automatically loaded which sets the appearance and preference of Verdi application.

You may optionally place novas.rc at several locations, and the searching order of them are -

  1. Command-line: -rcFile <novas.rc>
  2. System variable: $NOVAS_RC
  3. ./novas.rc
  4. ~/novas.rc
  5. $VERDI_HOME/etc/novas.rc
Linux

Automount NFS Share in Linux Using Autofs

Autofs is a service in Linux like operating system which automatically mounts the file system and remote shares when it is accessed. Main advantage of autofs is that you don’t need to mount file system at all time, file system is only mounted when it is in demand.

Autofs service reads two files Master map file ( /etc/auto.master ) and a map file like /etc/auto.misc or /etc/auto.xxxx.

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Linux

Install Perl PAR::Packer

Online Installation

Install Necessary RPMs

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[root]# yum install perl-ExtUtils-Embed
[root]# yum install perl-Crypt-OpenSSL*
[root]# yum install openssl*
[root]# yum install perl-CPAN

Install Required Perl Modules

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[root]# perl -MCPAN -e 'install Filter::Crypto'
[root]# perl -MCPAN -e 'install ExtUtils::CBuilder'
[root]# perl -MCPAN -e 'install PAR::Packer'

It will might report Errors when installing PAR::Packer. You must install the missing Perl package prior to installation of PAR::Packer.

Offline Installation

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Linux

Script: Add a Linux User 

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#!/bin/bash
# Script to add a user to Linux system
# -------------------------------------------------------------------------
# Copyright (c) 2007 nixCraft project <http://bash.cyberciti.biz/>
# This script is licensed under GNU GPL version 2.0 or above
# Comment/suggestion: <vivek at nixCraft DOT com>
# -------------------------------------------------------------------------
# See url for more info:
# http://www.cyberciti.biz/tips/howto-write-shell-script-to-add-user.html
# -------------------------------------------------------------------------
if [ $(id -u) -eq 0 ]; then
	read -p "Enter username : " username
	read -s -p "Enter password : " password
	egrep "^$username" /etc/passwd >/dev/null
	if [ $? -eq 0 ]; then
		echo "$username exists!"
		exit 1
	else
		pass=$(perl -e 'print crypt($ARGV[0], "password")' $password)
		useradd -m -p $pass $username
		[ $? -eq 0 ] && echo "User has been added to system!" || echo "Failed to add a user!"
	fi
else
	echo "Only root may add a user to the system"
	exit 2
fi
Linux

Install Perl Module

List all installed Perl modules
perldoc perllocal or instmodsh

Check if a specified module is installed
perldoc -li math::round # -l = list; -i = ignore case

Install Perl modules
Given an example of Math::Round to be installed

  1. Search & download the module (Math-Round-0.07.tar.gz) at https://metacpan.org/.
  2. Install the module
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    % tar xvf Math-Round-0.07.tar.gz`
    % perl Makefile.PL
    % make
    % make test
    % sudo make install
VLSI

Integrate SOS in Virtuoso

To get Cliosoft SOS integrated in Cadence Virtuoso, what you need to do is just to put 3 files in your $HOME (~/).

1) .cdsinit

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% cat ~/.cdsinit
let( (clioDir)
  clioDir = getShellEnvVar("CLIOSOFT_DIR")
  load((strcat clioDir "/scripts/cds_sosviadfII.il"))
)

2) cdsLibMgr.il

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% cat ~/cdsLibMgr.il
let( (clioDir)
  clioDir = getShellEnvVar("CLIOSOFT_DIR")
  load((strcat clioDir "/scripts/cdsLibMgr.il"))
)

3) cdsinfo.tag

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% cat ~/cdsinfo.tag
DMTYPE sos
Linux

Linux Command: Ip

ip 是个命令， ip 命令的功能很多！基本上它整合了 ifconfig 与 route 这两个命令，不过 ip 的功能更强大。

ip命令用法

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% sudo ip
Usage: ip [ OPTIONS ] OBJECT { COMMAND | help }
       ip [ -force ] -batch filename
where  OBJECT := { link | addr | addrlabel | route | rule | neigh | ntable |
                   tunnel | maddr | mroute | mrule | monitor | xfrm | token }
       OPTIONS := { -V[ersion] | -s[tatistics] | -d[etails] | -r[esolve] |
                    -h[uman-readable] | -iec |
                    -f[amily] { inet | inet6 | ipx | dnet | link } |
                    -o[neline] | -t[imestamp] | -b[atch] [filename] |
                    -rc[vbuf] [size]}

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