The Track Length Rules dialog is used to specify rules regarding the track length. These rules can apply to Nets or Sub Nets, these two types of item might not define a path, so you can define a rule for the total (including all spurs), or for the maximum pin to pin path (not including any spurs). These rules may also apply to Differential Pairs, Differential Pair Chains or Signal Paths where there is a definite pin to pin path.
The general rule matching mechanism is described here.
Shortcuts
Menu: Setup
Default Keys: T
Command: Technology
Locating this option
Available from: Setup menu > Technology option > Rules - High Speed - Track Length page
Using the Track Length Rules dialog
On selection, the Technology dialog opens, select Track Length. The existing Track Length Rules for the Technology being used will be presented.
Navigation
Using the editing pane
The appropriate rule is found for each net by working down the list of rules until the first match is found.
Hence, the order of the rules is important. A match is when the specified Attribute Name and Match
Value match attributes of a net. So the net must have the given attribute, and it’s value must
wildcard match the value. The
Wildcard Wizard is enabled using the small icon next to
the Match Value entry: 
For Nets And Sub Nets Apply Rule To
Nets and Sub Nets might not define a single pin to pin connection. You can therefore define the rule to be applied to the Total Track Length, or it can be defined as a rule for the Maximum Pin To Pin Track Length. If necessary, you can define two separate rules, one applying to the Total Length, the other to the Pin To Pin Length. Where the item defines a single pin to pin path (such as a Signal Path), then the Total Length and the Pin to Pin Length will be exactly the same, and the first matching rule will apply.
Total Track Length
You can define Minimum and/or Maximum track length. This track length will include any
adjustments caused by Track Length
Factor, Layer Change Length or
Max Vias
Specify the maximum number of vias on a track for the rule. For Pin To Pin checks, this is the number of vias pasted through in the given path.
Export and Import CSV
Use the Export CSV button to export the data in your PCB design into a CSV format file. Using the Export CSV option will provide you with a formatted template ready for you to edit in your own data.
Use the Import CSV button to import data back into the PCB design using a CSV format file.
The data in the file represents a spreadsheet of dialog contents with the data headings along the top row.
Units
The Units button allows you to locally switch between Metric and Imperial units whilst in this dialog. Once the dialog is closed, the units revert back to the original design units. If switching to different units to the design units, the value typed will be converted when you next enter this page.
Related Topics
Technology Overview | Using Dialog Grids | Nets | Differential Pairs | Signal Paths | Sub Nets | Rules Spreadsheet Bar | Track Length Limits | Design Rule Check | Export CSV | Import CSV