National-instruments Graphical User Interface Ultiboard Uživatelský manuál stáhnout pdf (Strana 95)

Chapter 3 Setting Up a Design

Net Group Settings

For net groups, the following Group Settings are available:

• Group Name

• Clearance Settings

• Trace Width Settings

• Trace Length Settings

• Routing Layers

• Routing Priority

• Locked

As well as setting the clearance for a net group, you can set clearances for

individual nets within that group. You can, for example, set the clearance

for the net group to 10 mils, and the clearance for two or more nets within

that group to 5 mils. In this case, if any net from the group comes within 10

mils of any element that is not in the net group, a DRC error is generated.

If one of the traces that you set to a 5 mils clearance moves to 5 mils or less

from one of the other traces with the 5 mils clearance setting, a DRC error

occurs.

Note Set individual trace clearances in the Nets tab of the Spreadsheet View. To do this,

select the desired trace, and locate the Trace Clearance column. Highlight Use Group

Settings and type in the desired clearance for that trace. You can also edit a trace’s

clearance from the General tab of its properties dialog box.

For information on any setting, select it in the Group Settings list. A

description appears in the field at the bottom of the dialog. You may need

to make the dialog box larger to view some of the descriptions. Do this by

dragging the dialog’s lower-right corner.

Part Group Settings

For part groups, the following Group Settings are available:

• Group Name

• Clearance Settings

• Part Spacing Settings

• Pin & Gate Swapping Settings

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National-instruments Graphical User Interface Ultiboard Uživatelský manuál Strana 95