Create "basic_unit" layout

If you have not created "pcell_demo" Pcell yet, please click here.

In order to build a mesh out of our Pcell "pcell_demo", we will first build a "basic_unit" layout, then use "basic_unit" to build a "2by2_unit" layout. Then we will build a mesh using "2by2_unit" layout. This tutorial assumes you have set up and started Cadence properly. This tutorial is process independent. However if you choose to skip steps, pre-created tutorial Pcells exists in hp_cds (MOSIS HP 0.5um process).

Part I. Create "basic_unit" layout
Part II. Use "basic_unit" to create "2by2_unit" layout
Next: Create a mesh layout with "2by2_unit" layout

Part I. Create "basic_unit" layout

1. Start with a new layout cell view "basic_unit". Please refer to Layout Edit Help on how to create a new layout.
2. In layout window, click Instance icon, a Create Instance window will pop up:
   
   
   
   
3. In Create Instance window, click on Browse button:
   
   
   
4. A Library Browser - Create Instance window will pop up. Select the layout view of the "pcell_demo" cell in the "demo_lib" library.
   
   
   
   Click on Close.
   
5. The Create Instance window will change to include the parameters of the Pcell.
   
   
   
   Input desired parameters:
   finger_length = 32
   fingers = 5
   step_distance = 8
   Then click on Hide button.
   Red circle indicates user input.
6. In layout window, carefully left click at x=2.0, y=0 to position the first instance of pcell_demo at x=2.0, y=0
   
   
   
7. Press SHIFT-F to see the entire layout .
   
   
   
8. Now we need to instantiate second set of fingers. In layout window, click on Instance icon. Create Instance window pops up:
   
   
   
   Input desired parameters:
   finger_length = 32
   fingers = 5
   step_distance = 8
   Then click on Hide button.
   Red circle indicates user input.
   
9. In layout window, carefully left click at x=4.0, y=4.0 to position the second instance of pcell_demo at x=4.0, y=4.0
   
   
   
10. Press F to see full view of the layout. Now add two rectangles as shown below.
    
    
    
11. Save your layout. We are done with "basic_unit" layout.

Now that we can proceed to create "2by2_unit" layout using "basic_unit" cell we just created.

Created September 17, 2001 by Kai He at khe@ece.cmu.edu