Allegro Constraint Compiler User Guide
Allegro Constraint Compiler
October 2019 23 Product Version 17.4-2019
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■ Rule Set name with prefix PCS_ added to the new Physical CSet name
Note: Multi-Row Header Rule= designation indicates the beginning of a Rule Set with all
constraint columns included in it until another Rule= designation starts.
Object Rule Specification Table
The Object Rule Specification table is used to assign rules to objects in a design. Rule
assignment can be accomplished by referencing group or Kind name and type classification
defined in an Object table or an existing Net or XNet in the design. The primary use for the
Object Rule table is to define explicit pin to pin rules of a group of objects by specifying a from-
to component designation. Once these pin-pairs are defined a rule set or an existing CSet
can be applied to the appropriate object level (Net Class, Net Group, and so on).
You can specify one-to-many constraint expansion that propagate rules down to the lowest
level while generating all supporting objects. For example, if relative propagation delay rules
are defined, the compiler automatically creates the required match groups. In addition, part
assignment can be driven by a mapping table to create many pin-pair relationships with
associated match groups.
Note: Relative Propagation Delay rules are only supported when an explicit pin-pair is
specified in the table using from component to component. Specifying global or local Scope
or longest pin-pair, longest driver/receiver and all drivers/all receivers are ignored.
