Virtuoso Schematic Composer User Guide

Creating a Multisheet Schematic

If there is already a sheet with the new sheet number, the sheet whose number you want to change is inserted before the existing sheet and gets the specified sheet number. The sheets following it are automatically renumbered. On the example form above, sheet 1 becomes sheet 10. sheets 2 through 9 stay the same, and sheets 10 and up, if they exist, are increased by 1. The values displayed in the title block change to reflect the new sheet numbers.

Renumbering Sheets

To sequentially renumber all sheets in a multisheet schematic beginning with 1, do the following:

From an index schematic, choose Sheet – Resequence.

The schematic editor renumbers all sheets sequentially beginning with sheet 1. For example, if you previously deleted sheets 4 and 5 so that your sheets are numbered 1 2 3 6 7, this command reorders the pages in the correct sequence, 1 2 3 4 5.

Working with Cross-References

You can display cross-reference annotations to schematic and offsheet pins to indicate other locations in the design where the same pins are used on different sheets.

You can cross-reference multisheet pins to

■Reference all pins on all sheets of a multisheet schematic

■Zoom in automatically from one pin to the cross-referenced pin

■Use the index schematic to link directly to specific hierarchical pins in your design

■Produce a cross-reference report of all locations in your schematic where pins are crossreferenced

This section discusses the following topics:

■Understanding Cross-Reference Zones on page 215

■Understanding Pin Cross-References on page 216

■Understanding Cross-Reference Reports on page 217

■Preparing to Cross-Reference on page 217

■Displaying Cross-References on page 218

Virtuoso Schematic Composer User Guide

Creating a Multisheet Schematic

■Zooming In to View All Cross-Referenced Pins One by One on page 220

■Going to a Specifi Hierarchical Pin on page 221

■Viewing Cross-Reference Reports on page 221

■Editing a Cross-Reference Display on page 223

■Controlling the Format String Syntax on page 224

■Customizing the Format String Syntax on page 225

Understanding Cross-Reference Zones

Multisheet schematics with borders show numbers and letters that reference different zones, similar to the squares on a map.

Aug 10 21:57

Letter zones

Number zones

Virtuoso Schematic Composer User Guide

Creating a Multisheet Schematic

Understanding Pin Cross-References

Pin cross-references are displayed on the schematic next to the pin name.

Pin names i1 and a<0:3>,b

Example 1

Two pin names reference each other if any of the individual bits of the pin names are shared. For example, the bundle a<0:3>,b references the following pins:

a<0:3> b

Example 2

Pin PP<7:0> is referenced at sheet 1, zone A2 by pin name PP<0:3>; at sheet 2, zone A1 by pin name PP<7:0>; and at sheet 3, zone B4 by pin name PP<7:0>. The reference names are not listed for the last two locations because the reference name matches the pin name.

PP<7:0> 1A2(PP<0:3>),2A1,3B4

Virtuoso Schematic Composer User Guide

Creating a Multisheet Schematic

Understanding Cross-Reference Reports

The following cross-reference report shows pin names and lists locations where the pins are referenced.

Preparing to Cross-Reference

You must make sure your schematic is error free before you cross-reference pins, but you do not have to correct warnings.

To check a multisheet schematic for errors before displaying cross-references, do the following:

1. From the index schematic, choose Design – Check and Save.