Introduction to VLSI Design

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Example : Creating a Symbol

Step 4 : Editing the shape of the symbol icon

1. In the new window, the automatically generated symbol is shown.

As seen in the window, the default shape of the symbol icon is a rectangle, with the pins located as defined during the previous step in Symbol Generation Options pop-up window. The small red squares indicate the connection points for each corresponding pin. The red rectangle surrounding the whole symbol determines the clickable area to select the symbol when used in a schematic.

Symbol level view

2. If you are not satisfied with the symbol properties, then you can create a new symbol simply by editing the existing one.

You can do the following operations on your symbol :

The following is an example for a manually created inverter symbol, which was obtained by editing the symbol above.

New symbol after editing

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Last Updated by Ilhan Hatirnaz on 10/30/1998