National-instruments Graphical User Interface Ultiboard Manual de usuario descargar pdf (Pagina 212)

Chapter 7 Autorouting and Autoplacement

• Distance-2 (2 Grid) Cost Factor—Controls the use of channels

left by ripped-up traces in the far distance (2 or more grid points,

trace-to-trace). A high value results in infrequent use of these

channels, forcing relatively more global changes during rip-up

and retry routing.

3. Optionally, enable the Memory Cleanup During Routing checkbox

in the Router Housekeeping area to purge the memory of unneeded

information.

4. If you wish to return the values to the default settings for Ultiboard,

click Default.

Caution The Default button sets default values for all tabs in the Routing Options dialog

box.

Routing Options: Optimization Tab

Complete the following steps to set optimizer options:

1. Select the Optimization tab in the Routing Options dialog box.

2. Edit one or both of the fields in the Optimizer area:

• Optimizer Passes—Use to set the number of optimizer passes

that are automatically activated after the autorouter achieves

100 percent completion.

• Optimization Direction—Select Normal to instruct the

optimizer to ignore layer-specific preferred routing directions to

keep the number of vias to a minimum; Preferred Direction

instruct the optimizer to consider layer-specific preferred routing

directions. This may increase the number of vias on your board;

45 Degrees

to instruct the optimizer to prefer 45 degree routing

where appropriate.

3. Optionally, enable the Memory Cleanup During Optimizing

checkbox in the Optimizer Housekeeping area to purge the memory

of unneeded information.

4. If you wish to return the values to the default settings for Ultiboard,

click Default.

Caution The Default button sets default values for all tabs in the Routing Options dialog

box.

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National-instruments Graphical User Interface Ultiboard Manual de usuario Pagina 212