Schematic Editor, Virtuoso Analog. Design Environment, or Figure 1: The industry-standard Virtuoso Layout Suite user interface to repetitive manual tasks. Figure Dialog for creating a Layout View of the inverter cell. Figure Initial nactive rectangle. Page 4. CHAPTER 5: Virtuoso Layout Editor. Figure Virtuoso XL Layout Editor User Guide Virtuoso Layout Editor User Guide.
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To virtuoao a pin with a text label simply select, Pin After you are done, your layout should look like this: We are getting ready to finish this cell and your boss has just informed you that the power use have been changed from M1 to M2.
For example, if you need to go from poly up to M1, then you simply start drawing a path type p in poly, viftuoso click the left mouse button somewhere close to where you want the contact to be and change the layer in the “Create Path” menu to “metal1”. Before we go any further, here is how to get help if you ever need it. Simply type in “nand2” under cell name and “layout” under view.
Notice that the inputs and outputs are all found within the power straps.
Virtuoso Tutorial Version 1.0
You can undo whatever you have just done in Virtuoso. If you have trouble with the p command see the next section for some hints. Now that you have laid out your power and ground rails you should wire them up using the wiring mode as before.
At the bottom of the window is the Virtuoso Message Area.
Virtuoso XL Layout Editor User Guide
It is a complete layout environment. The Virtuoso Message Area is a sort of mini-help feature. Two nfet’s merged stacked together should appear.
The zoomed-in nmos should look like this:. In this window, you will place transistors, draw mask layers etc. Consult CDK manuals if needed.
Now you can continue to draw your path in the new layer. Once you have drawn the top power line you can simply copy it and move it down. Click on Parameters and change the width to 1. OK, now that we are here, let’s say our boss comes over again and says “sorry but you need to bring the outputs to the bottom of the cells”. For documentation on Cadence tools use openbook. The cursor changes to let you know you are in Edit Edge mode.
Before proceeding you should bring up the Virtuoso Manual and see what’s there. Read more about layout macros such as nmos here. To change them simply select the upper Vdd rail and hit q to enter layer properties.
Your layout should look like this practical advice: Clicking once on a polygon or cell will select the object. Our little NAND gate example should now be done. Using r and p hotkeys to draw rectangles and paths, wire up the two left contact regions and add the connection to the right pfet contacts.
Place it close to the nmos as shown below:. After you hit “OK”, Virtuoso screen will appear as shown below in addition, LSW window with various mask layers will automatically pop up:. Welcome to Virtuoso, the full custom layout editor from Uswr, Inc. Once you have selected an object or paint you can do lots of things with it.
Wiring Mode – Changing Layers Notice that the inputs and outputs are all found within the power straps. Place it close to the nmos as shown below: Hit “Enter”, following window will pop up: Simple Layout OK, let’s get started on some layout.
It can say something like ” Select the figure to be stretched Once you have the edge you want click the left mouse button Button-1 and move the mouse in the direction you wish to stretch the edge. You should now be editing layout view of “row” cell. Clicking the left mouse button once on a piece of paint selects that particular rectangle of paint.