一元和二元规则类型.pdfVIP

Unary and Binary Rule Types There are two types of design rules - unary and binary. Unary rules apply to one object, or each object in a set of objects. As a consequence, unary design rules have one rule scope. Binary rules apply between two objects, or between any object in one set to any object in a second set. As a consequence, binary design rules have two rule scopes.An example of a unary rule is the Solder Mask Expansion rule. This rule applies individually to each pad identified by the rule scope. An example of a binary rule is the Clearance rule, which applies between any copper object in the first set and any copper object in the second set, as identified by the separate queries of the two rule scopes. Viewing Applicable Unary Rules For any placed object in the current design, you can quickly access information about which unary design rules apply to that object. Position the cursor over the object (or select it), right-click and selectApplicable Unary Rules from the pop-up menu. The Applicable Rules dialog will appear. All defined design rules that could be applied to the selected object are analyzed and listed in the dialog. The specific constraints for each rule are also displayed. Each rule that is listed in the dialog will have either a tick ( ) or a cross ( ) next to it. A tick indicates that this is the rule with the highest priority out of all applicable rules of the same type and is the rule currently applied. Lower priority rules of the same type are listed with a cross next to them, indicating that they are applicable but, as they are not the highest priority rule, they are not currently applied.Any rules that would apply to the object but are currently disabled also have a cross next to them and are shown using strike through highlighting. Viewing Applicable Binary Rules In a similar fashion, you can also access information about the binary design rules that apply between two placed objects in a design. Position the cu