Virtuoso Schematic Composer User Guide

Creating Schematics

Adding Wires and Pins to Blocks

Do not create a block pin using the Add – Pin command in either the symbol editor or schematic editor.

For general information, see Adding Narrow or Wide Wires.

When you add a wire that touches the edge of a block, the editor automatically creates a block pin attached to the wire.

To add wires to a block, do the following:

1.Choose Add – Wire.

2.Click to indicate wire segment endpoints.

You can either start a wire or end a wire along the edge of a block. The system creates a pin where the wire touches the block edge. The pin name is constructed from the pin name prefix and a unique sequence number. The pin direction depends on the block pin direction rule.

pinName blockName

Changing the Block Pin Direction Rule

When the block pin direction rule is set to edge,

■Any pin created on the left side of the block becomes an input pin

■Any pin created on the right side of the block becomes an output pin

Virtuoso Schematic Composer User Guide

Creating Schematics

■Any pin created on the top or bottom side of the block becomes an inputOutput pin

InputOutput pin

When the block pin direction rule is set to order of entry, one of the following applies:

■Ending the wire on the edge of the block creates an input pin

■Starting the wire on the edge of the block creates an output pin

Starting the wire on the edge of the block creates an output pin.

To set the block pin direction rule for new block pins to edge or order of entry, do the following:

1. Choose Options – Editor.

Virtuoso Schematic Composer User Guide

Creating Schematics

The Editor Options form appears.

2.Select the Block Pin Direction Rule option you want.

3.Click OK.

Changing the Direction or Name of a Single Block Pin

To change the direction or name property of a pin, do the following:

1.Select the block pin only.

2.Choose Edit – Properties – Objects.

Virtuoso Schematic Composer User Guide

Creating Schematics

The Edit Object Properties form appears.

Edit Object Properties

3.Change the pin Name or Direction properties.

4.Click OK.

Changing the Names and Directions of Multiple Block Pins

To change the name and direction of multiple block pins, do the following:

1.Select the block.

2.Choose Edit – Properties – Objects.

Virtuoso Schematic Composer User Guide

Creating Schematics

The Edit Object Properties form appears.

Edit Object Properties

3.In the Show field, turn on thesystem button.

4.Do one of the following:

In the Pin Direction cyclic fields, change the pin directions.

Turn on the Inherit button to use the associated net name as the pin name.

5.Click OK.