Chapter 7
Autorouting and Autoplacement
©
National Instruments Corporation
7-15
•
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
to
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.
