Virtuoso Schematic Composer User Guide

Creating a Multisheet Schematic

The following sheet title block shows the information from the form on the previous page.

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Editing the Sheet Border Size and Type

To change the existing size and type of a schematic border, do the following:

1.Choose Sheet – Edit Size.

The Change Sheet Border Size form appears.

Change Sheet Border Size

Virtuoso Schematic Composer User Guide

Creating a Multisheet Schematic

2.Change the Border Size and Border Type cyclic fields.

To delete the sheet border of a schematic sheet, set the Border Size to none.

3.Click OK.

Understanding Offsheet Pins and Their Naming

Conventions

Offsheet pins are the pins you use to connect nets between sheets of a multisheet schematic.

Hierarchical pins (schematic pins) connect signals that span different levels of a hierarchical design. When you place a hierarchical pin or offsheet pin in a sheet schematic, the schematic editor creates an equivalent pin in the index schematic.

The following examples show how to use hierarchical and offsheet pins in a multisheet schematic. See the pin naming conventions used in these four examples.

Example 1

Two hierarchical pins, A<0:7> and OUT1<0:7>, are placed in sheet 1. Bus signal A<0:7> appears in both sheets. To connect these sheets, you need either an offsheet pin in sheet 1 or a matching hierarchical pin named out2<0:7> in sheet 1.

KEY:

Schematic pins

Offsheet pins

Example 2

In this example, the following hierarchical pins represent the partitioned bit width of a bus signal, A<0:7> and OUT<0:7>:

A<0:3>, B<0:3>, OUT<0:3> (in sheet 1)

A<4:7> and OUT<4:7> (in sheet 2)

Virtuoso Schematic Composer User Guide

Creating a Multisheet Schematic

The example shows the usage of offsheet pin S<0:3> connecting sheet 1 to sheet 2 and vice versa.

Example 3

Pin A is hierarchical in sheet 1.

To access pin A from sheet 2, you use an offsheet pin.

KEY:

Schematic pins

Offsheet pins

Example 4

A hierarchical pin for the bus B<0:7> is placed in sheet 1.

Sheet 2 uses only two bits of the bus, which you access with offsheet pin B<0:1>.

Virtuoso Schematic Composer User Guide

Creating a Multisheet Schematic

Sheet 3 uses another two bits, which you access with offsheet pin B<6:7>.

Sheet 3

KEY: Schematic pins Offsheet pins

B<6:7>

Adding Offsheet Pins to Multisheet Schematics

To add offsheet pins to connect signals that span several sheets, do the following:

1.Choose Add – Pin.

The Add Pin form appears.