Migration Guide for Allegro Platform Products
Core Allegro Platform Back-End Products
October 2019 80 Product Version 17.4-2019
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■ Constraint Manager files are now XML-based and use new extensions.
To run validation checks when editing or creating these files, use the new schema (XSD)
validation files, which are available at /share/pcb/
consmgr/schemas.
■ Front-end Constraint Manager files, such as .dcf, pstcmdb.dat,
pstcmbc.dat, are now single-file databases. On saving a pre-17.x design for the first
time, these files will be overwritten with the new single-file databases.
■ The default units of constraint values have been changed to length-based units from
time-based units.
■ In 17.x, differential constraints captured in both, the physical, and electrical domains, will
now honor values from the following:
❑ Physical domain: if the object is not part of a differential pair
❑ Electrical domain: if the object is part of a differential pair
Differential constraints captured in both the physical and electrical domains are as
follows:
❍ DIFFP_PRIMARY_GAP
❍ DIFFP_COUPLED_PLUS
❍ DIFFP_COUPLED_MINUS
❍ DIFFP_MIN_SPACE
❍ MIN_LINE_WIDTH
❍ DIFFP_NECK_GAP
❍ MIN_NECK_WIDTH
■ In 17.x, Class-Class and Region-Class-Class objects will no longer inherit constraints
from their parent Class objects.
■ The base copy files, which reflect information used in the previous flow, are included in
the destination database (schematic or layout). The schematic Constraint Manager
File Extension
Constraint file .dcfx
Technology file .tcfx
Customization file .wcfx
