Cad Wiki for Analog IC Courses

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===== Access to Cadence Tools =====

In order to use Cadence from outside the UD Campus, you will need to use VPN  to access the ECE VMs (i.e. **cpeg424.ece.udel.edu**). If you are in the campus network, then skip the VPN setup.

==== VPN Setup ====
Follow these steps to setup your off-Campus Cadence access:

  -Download and setup the [[https://services.udel.edu/TDClient/32/Portal/KB/ArticleDet?ID=113|AnyConnect VPN client software]]. Please note that Cisco VPN client only supports Windows 7 or higher version OS.
  -As the above site mentions, you will need **Google two-factor authentication (2FA)** whose code will be the second password in the AnyConnect software. The 2FA code is read from an app that you install on your smartphone.

<note important> Please email UD IT helpdesk ([[askit@udel.edu]]) directly for VPN related assistance/troubleshooting. Their webapge is [[http://www1.udel.edu/it/|here]].</note>

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==== Method 1: VNC Remote Connection Setup (Preferred Method) ====
You can use a [[vnc_install|VNC client]] with X11 forwarding over ssh to access the servers. A VNC remote connection is slightly tedious to setup the first time but infinitely more stable than X2Go.

Some of my PhD students successfully use [[https://mobaxterm.mobatek.net/|MobaXterm]] but I haven't explored it.

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==== Method 2: X2Go Client Setup ====
X2Go software is buggy and we have switched to VNC.

If needed, follow the instructions at [[x2go_install|X2Go Client]] to download and install X2Go client. 

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==== Method 3: X11 Forwarding over SSH ====
If for some reason VNC or X2Go are not working, Windows users can use graphics forwarding over ssh by following the link:  [[ssh_X11|SSH X11]]

**Linux and Mac users** can use ssh instead of the X2Go client. Mac users will need to install the [[https://www.xquartz.org/|XQuartz]] software. Use the following command

<code> ssh -XY [username]@cpeg424.ece.udel.edu  </code>

You could also try using [[https://www.realvnc.com/en/connect/download/viewer/macos/|MacOS]] version of RealVNC client. Please note that the Mac options haven't been tested by the instructor/TA. Please contact [[https://www.eecis.udel.edu/helprequest|EECIS IT]] for help with Mac issues. 

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==== Useful Tips on Improving Remote Desktop Performance ====
 <note tip>For VPN access problems, check if you are using the right VPN client for your OS. Also make sure that you don't have any Firewall blocking VPN access/ports on your personal computer.</note>

  * If possible, use an Ethernet LAN connection at home instead of accessing Cadence over the Wireless LAN. Wireless LAN in a dense urban environment offers lower throughput due to interference and due to the protocol overheads. A slow WLAN connection may drop a user session, make remote desktop freeze up, and you may lose your work. 
  * There are some Ethernet-to-USB adaptors on the market which can be used in laptops that don't have an Ethernet port. 
  * Please keep saving your work and occasionally take backups using FTP. The ECE IT Admins may reboot the Server every Friday midnight. 

<note tip>Its a good idea to save your files and take regular backups. It is recommended that you take FTP backups (e.g. using bitvise sftp or Filezilla) from the server on your personal machine (or mail to yourself).</note>
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