05912820 is referenced by 15 patents and cites 37 patents.

A method and apparatus for distributing clock drivers within a hierarchical circuit design, wherein the clock drivers are concentrated in locations where they are actually needed rather than uniformly distributed throughout the circuit design. In an exemplary embodiment, the actual clock loads within a selected hierarchical region are determined, and a sufficient number of clock drivers are added as children objects to the selected hierarchical region. Since many placement tools may place the children objects within an outer boundary of the corresponding parent object, the clock drivers, as children objects of the selected hierarchical region, may be placed within the outer boundary of the selected hierarchical region. Accordingly, the clock drivers may be concentrated in the locations where actually needed.

Title
Method and apparatus for distributing a clock tree within a hierarchical circuit design
Application Number
8/786851
Publication Number
5912820
Application Date
January 22, 1997
Publication Date
June 15, 1999
Inventor
John T Rusterholz
Roseville
MN, US
James E Rezek
Mounds View
MN, US
Joseph P Kerzman
New Brighton
MN, US
Agent
Mark T Nawrocki Rooney & Silvertson P A Starr
Charles A Johnson
Assignee
Unisys Corporation
PA, US
IPC
G06F 17/50
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