Generating Symbol View

You may want to revisit previous tutorials ( Setting up Unix Environment, Schematic Entry with Composer) before doing this tutoruial.
In this tutorial, we are going to create a symbol for inverter to create a hierarchical schematic at the logic gate level.

To create a symbol,  

1. Select File --> New --> Cell view in library manager and choose library under which you would like to create the new cell view
2. Enter a cell view name and choose Composer-Symbol as the tool. View name should be symbol exactly according to Figure 11.


creating symbol  
Figure 11. Creating a symbol 
 


Then, the symbol editing window should be appeared. It allows you to draw any kind of shape to represent you logic gate.
The important thing is to have input and output pins match whatever it is you are representing. In this case, we need to match input pin "IN" and output pin "OUT"
of the inverter. Rather than drawing an symbol of inverter, it is much easier to copy one that has already been drawn.


To import a symbol,

1. From Symbol Editing menu, select Add --> Import Symbol.   This brings out Import Symbol form. Click on Browse and select inverter in library of
    NCSU_Digital_Parts. The form should be same like Figure 12.


importing symbol  
Figure 12. Importing symbol



2.  Put the symbol down in the Symbol Editing like in Figure 13.


The inverter symbol    
Figure 13. The inverter symbol



3. Don't forget to save by selecting Design --> Check and Save in Symbol Editing menu.

 










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