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Controlling the Routing Functions
© National Instruments Corporation
4.
The Automatic Testpoint Placement Setup dialog box disappears
and one test point is placed on or near each net on your board. If placed
near an existing net, the test point will be automatically connected.
5.
Results of testpoint placements, including a list of any nets which the
router could not connect, will appear in the Results tab of the
Spreadsheet View. You can click on an error to go to the unrouted
testpoint.
Router functions are controlled through the Routing Options dialog box,
which is displayed when you choose Autoroute»Autoroute/place
Options.
Routing Options: General Tab
Complete the following steps to set up general routing options:
1.
Select the General tab in the Routing Options dialog box.
2.
Complete the following fields in the Routing area:
•
Routing Mode—Select Gridbased, to place the traces on a grid;
Gridless to place them off the grid; or Progressive which will
attempt to place the traces on a grid, and then place those that
remain off the grid.
•
Grid Type—Select English - the router grid will be some
sensible number of mils (10 mils, 20 mils, etc.); or Metric - the
router grid will be some sensible number of millimeters (0.2 mm,
0.3 mm, etc.); or Board Settings - Ultiboard will choose either
English or Metric, depending on the units Ultiboard is using. This
setting is independent of the Routing Mode setting in the
Routing area.
•
Optimization Pass checkbox—Enable to permit router passes
that will optimize the placement of the traces.
3.
Complete the following fields in the Settings area:
•
Via Grid—Select 100 mil standard, which places the vias on a
100 mil grid; 50 mil standard, which places the vias on a 50 mil
grid; 25 mil standard, which places the vias on a 25 mil grid; or
None, which will not place the vias on any grid. The optimal grid
size is determined on-the-fly by Ultiboard during the routing
process; if it differs from the Via Grid setting, vias will be placed
at the grid point closest to the 100, 50 or 25 mil setting.
Chapter 7
7-11
Autorouting and Autoplacement
NI Ultiboard User Manual
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