Attributes Used in Silk Screen Checks

Attributes assigned to features in the product model control the analysis.

Feature Attributes

Table 1. Silk Screen Checks Feature Attributes

Name

Description

Copper Feature Ignore

Copper features bearing this attribute are ignored in analysis actions. (Presently implemented only for Rout Test.)

Drill Type

This attribute is attached to hole features in drill layers. It defines the type of drill and is used extensively during fabrication analysis.

SMD Pad

This attribute should be attached to outer layer pads which are lands for SMD components. It is set by the ‘Set SMD Attribute’ Cleanup Action.

Copper Balancing

This attribute is attached to features which are added during a pattern fill operation, either manually or through the Copper Balance DFM action.

String Angle

For text features, the value of this attribute is the original (in the input file) rotation angle of the text string of which this feature is a part. This attribute is assigned to translated jobs of formats: Cadence Allegro BRD or APD, Mentor Graphics Board Station, Mentor Graphics PADS.

Copper Text

This attribute defines a feature as a nomenclature legend. It affects the fabrication analysis by directing spacing checks between such features into a new category (Text to Text).