USER GUIDES

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Global Nets and Inherited Connections

• For detailed documentation check the siemens support page on Global Nets and Inherited Connections (NOTE You need access to Siemens Support)
• Check also a knowledge-base on Net Cap Tool

Overriding the Default Net Expression

Tags #inherited #inherited-connection

• The NetSet property is used on a cell instance to override the global signal within the hierarchy of that specific instance. Example: the schematic dig_tmux_top in A0_dig Lib has two standard-cell circuits dig_tmux_blksel and dig_decoder_3b with global signals power_vdd5 and ground_gnd attached to vdd5! and gnd! respectively. To override the net expression and attach the global signals to the pins (V5V and vsa)

• Steps to pass inherited connections:

  • Select the instance for which you want to override the default global net.
  • Click the Add Property button in the Properties Navigator.
  • For overriding the vdd5! with the pin V5V
    • Name: power_vdd5
    • Type: NetSet
    • Value: V5V
  • For overriding the gnd! with the pin vsa
    • Name: ground_gnd
    • Type: NetSet
    • Value: vsa

REMOTE ACCESS

Secure VNC access through a SSH tunnel

VNC connections are, by default, unencrypted. This guide shows how to tunnel VNC traffic through an SSH connection to a local port. For convenience, this guide uses the same local port number as the VNC server eg. 5901 but could be different.

USING PUTTY IN WINDOWS

• This section assumes a SSH private/public has been created and the public key has been installed in the remote server at ~/.ssh/authorized_keys

• Copy the private key to a safe location in your local drive to be used in PuTTY.

• Open PuTTy and enter the IP address in the Host Name (or IP address) field.

• Open the menu Connections -> SSH -> Auth, click the Browse button in the Private key file for authentication field, browse to the location of the private key and enter it.

• Open the menu Connections -> SSH -> Tunnels and enter 5901 as the Source port and <IP-Address>:5901 as the Destination. Beneath Desination, select Local and Auto. NOTE This example is for the user with VNC server address :1. Similarly, for user with VNS server :2, it will be 5902

• Click Add to add the tunnel info. You should see L5901 IP-Address:5901 in the box under Forwarded Ports:.

• Now click Sessions, enter a name for the session and click Save

• From now on, you can open PuTTy, select the saved session, clicl Load and the click Open at the bottom.

• It will ask for username, enter your remote server username to login.

• Once the PuTTy connection is made to the remote server, there should be a secure SSH tunnel from the local port (eg. 5901) to the remote server (eg. IP-ADDR:5901).

  • In order to check if the port is open, in a Windows command window, type the command netstat -ano | grep 5901 and you should get an output something like:

TCP    127.0.0.1:5901         0.0.0.0:0              LISTENING       7856
TCP    [::1]:5901             [::]:0                 LISTENING       7856 

• Open the VNC client (eg. tightVNC) and enter localhost:5901 in the RemoteHost field and enter the VNC password.