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An example of the Edit PCB Rule dialog (displaying Clearance Rule)
The Edit PCB Rule dialog allows you to edit the properties of the selected design rule, including the name, scope, and constraints.
The dialog is accessed from within the PCB Editor in the following ways:
When defining the scope of a design rule - the extent of its application - you are essentially building a query to define the member objects that are governed by the rule. Use the options available in the dialog to build the query required. Depending on whether the rule is unary or binary, you will need to define one or two scopes, respectively.
Controls are identical, whether defining one or two rule scopes and are detailed in the following sections.
This region of the dialog presents the constraints applicable to the type of rule being edited. The controls vary depending upon the type of design rule being edited. Use the various controls to configure these constraints as required.
Controls highlighted in blue can be clicked on and edited, if desired. Enable any of the various options provided, if desired.
Click on a cell to edit the data, as required.
Brackets have the highest precedence within an order of precedence that has been defined for the various operators and that determines how queries are interpreted by the software (whenever you have not provided brackets). The sequence of this order is as follows:
Brackets
Not
^, *, /, Div, Mod, And
+, -, Or, Xor
=, <>, <, >, <=, >=
&&, ||
This order of precedence is similar to that used in Pascal type languages. Ambiguities are resolved by working from left to right. Parentheses are evaluated from inside to outside and equal levels are evaluated left to right.
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