Tutorials:Cadence:AdvancedTopics

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Advanced Topics

Pad frame

One tiny chip unit is 1.5mm x 1.5mm. The pad frame provided here has a total of 40 pins. The 4 corner pins are used for VDD and GND (note the +/- symbols in the layout) and the remaining 36 pins are available for I/O.

To use the pad frame, please do the following steps:

  1. Download Padframe_C5N.tgz into $HOME/cadence/library.
  2. Type "cd $HOME/cadence/library".
  3. Type "tar -xzvf Padframe_C5N.tgz". This will extract the pad library.
  4. Type "cd ..".

  5. Edit cds.lib and add the following line:

    DEFINE pad library/pad
  6. Execute virtuoso. The pad library will now appear in the Library Manager.


The pad frame layout is shown below.

Tutorials-Cadence-Padframe-001.png



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