clock tree and skew

Clock Trees and Skew Groups
Clock trees and skew groups are the two key object types used in the CCOpt clock specification. The term object is used here
because clock tree and skew group objects can be defined, modified, and deleted using commands. For example,
create_ccopt_clock_tree , create_ccopt_skew_group , modify_ccopt_skew_group , and delete_ccopt_skew_groups .
Properties can be set per skew group or clock tree instead of globally.
For example,
set_ccopt_property
–skew_group name
target_skew value .
The report_ccopt_clock_trees and report_ccopt_skew_groups commands can be used to generate reports on clock trees and
skew groups. For more information, see the Reporting section.
Clock Trees
The union of all clock trees specifies the subset of the circuit graph that CTS will buffer. The circuit subset covered by clock tree
definitions is best referred to as a clock tree graph since clock trees may inter

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