Peter M Lai

US Patent:

6954914, Oct 11, 2005

Filed:

Mar 24, 2003

Appl. No.:

10/395436

Inventors:

Shyam Sundar - Sunnyvale CA, US
Aveek Sarkar - Mountain View CA, US
Peter F. Lai - San Jose CA, US
Rambabu Pyapali - Cupertino CA, US
Teong Ming Cheah - Sunnyvale CA, US

Assignee:

Sun Microsystems, Inc. - Santa Clara CA

International Classification:

G06F017/50

US Classification:

716 5, 716 6, 716 2

Abstract:

The present application describes various embodiments of a method and an apparatus for determining electromigration risks for signal nets in integrated circuits. A model for each one of the global nets connecting various circuit blocks in an integrated circuit is created using circuit blocks' timing model and detailed standard parasitic format representation (DSPF) of each global net. The final layout of the integrated circuit is not necessary to determine the electromigration risks. The models can be generated during the early stages of the design cycle once the DSPF of the global nets is available.

US Patent:

7007256, Feb 28, 2006

Filed:

Mar 6, 2003

Appl. No.:

10/383092

Inventors:

Aveek Sarkar - Mountain View CA, US
Shyam Sundar - Sunnyvale CA, US
Peter F. Lai - San Jose CA, US
Rambabu Pyapali - Cupertino CA, US

Assignee:

Sun Microsystems, Inc. - Santa Clara CA

International Classification:

G06F 9/45
G06F 9/455
G06F 17/50

US Classification:

716 6, 716 4, 716 11, 703 14, 703 19

Abstract:

The present invention describes a method and an apparatus for determining switching power consumption of global devices (e. g. , repeaters, flops or the like) in an integrated circuit design during high-level design phase after the global routing for the integrated circuit is available. The clock cycle is divided into various timing intervals and the timing reports are generated for each cycle to determine a time-domain staggered distribution of each device's switching activity within a given timing interval. Each device's switching activity is analyzed within the given timing interval (or segment thereof). The power consumption is determined for each device that switches in the given timing interval.

US Patent:

7032200, Apr 18, 2006

Filed:

Sep 9, 2003

Appl. No.:

10/657964

Inventors:

Sriram Satakopan - Sunnyvale CA, US
Arvindvel Shanmugavel - Mountain View CA, US
Shunjiang Xu - Sunnyvale CA, US
Von-Kyoung Kim - Santa Clara CA, US
Peter Lai - San Jose CA, US

Assignee:

Sun Microsystems, Inc. - Santa Clara CA

International Classification:

G06F 17/50

US Classification:

716 6, 716 4, 716 5

Abstract:

A technique improves the performance of an integrated circuit design by selectively replacing low Vtransistors with standard Vtransistors. The selection of gates for replacement may be based on a multi-path timing analysis. If a low Vvariant of a gate instance increases a path cycle time as compared to a standard Vcounterpart, the maximum of the path cycle times for all paths that include the low Vvariant and the maximum of the path cycle time for these paths with a standard Vvariant are calculated. If the maximum path cycle time for the path including the low Vvariant is greater than the maximum path cycle time for the path including the standard Vvariant, then that low Vvariant is substituted with a standard Vvariant. Thus, integrated circuit designs prepared in accordance with the invention may exhibit improved cycle times.

US Patent:

7036096, Apr 25, 2006

Filed:

Sep 8, 2003

Appl. No.:

10/657431

Inventors:

Aveek Sarkar - Mountain View CA, US
Yongning Sheng - Sunnyvale CA, US
Peter F. Lai - San Jose CA, US
Rambabu Pyapali - Cupertino CA, US

Assignee:

Sun Microsystems, Inc. - Santa Clara CA

International Classification:

G06F 17/50

US Classification:

716 1, 716 5, 716 11, 716 18

Abstract:

The capacitances of one or more inputs/outputs of a circuit are estimated by using an extraction tool () to extract information associated with the inputs/outputs from a netlist. The information includes information associated with circuit devices directly connected to the inputs/outputs, particularly information related to device connectivity and the feature sizes of the device. Once the information is extracted, a capacitance determination element () aggregates the feature sizes of all the circuit devices connected to each respective input or output, to obtain aggregate feature sizes for each respective input/output. The aggregate feature size is used in determining the total capacitance of the input/output. The total capacitance thus determined can be provided to a timing analysis tool (), which uses the total capacitance of each input or output to generate a timing model for the circuit.

US Patent:

7136752, Nov 14, 2006

Filed:

Jun 24, 2004

Appl. No.:

10/710178

Inventors:

David D. Needelman - Torrance CA, US
Rongsheng Li - Hacienda Heights CA, US
Richard A. Fowell - Rolling Hills Estates CA, US
Peter C. Lai - Alhambra CA, US

Assignee:

The Boeing Company - Chicago IL

International Classification:

G05D 1/00
G01C 21/02

US Classification:

701222, 244164, 701 13

Abstract:

A system () includes: a) A vehicle () includes an attitude or angular velocity control system (), a plurality of star trackers or star sensors () each having a field of view (); b) a memory () having a star catalog (), an allocated area for a star pair catalog () and a reference table () stored therein; and c) a processor () coupled to the attitude or angular velocity control system (), the star trackers or star sensors (), and the memory (). The processor () populates the star pair catalog (), using the method described herein. The processor () then periodically determines the vehicle inertial attitude or angular velocity or sensor alignment, based, in part, on the star pair catalog () and reference table (). The novel ability of the software to autonomously populate the star pair catalog () allows users to avoid uploading a large amount of data, and the problems associated with such an upload.

US Patent:

7219014, May 15, 2007

Filed:

Apr 29, 2004

Appl. No.:

10/709346

Inventors:

David D. Needelman - Torrance CA, US
Rongsheng Li - Hacienda Heights CA, US
Richard A. Fowell - Rolling Hills Estates CA, US
Peter C. Lai - Alhambra CA, US
Bruce N. Eyerly - Torrance CA, US
Jonathan French - St. Louis MO, US

Assignee:

The Boeing Company - Chicago IL

International Classification:

G01C 21/00
G05D 1/00

US Classification:

701222, 701 3, 701 4, 244164

Abstract:

A vehicle () including a control system () is used for controlling vehicle attitude or angular velocity (). The processor () is coupled to a star sensor or tracker () and a memory () that may include a star catalog (), and an exclusion list (). The exclusion list (), a list of stars to be temporarily excluded from consideration when determining attitude or angular velocity or relative alignment of star sensors or trackers, is calculated on-board. Such a calculation prevents the necessity for a costly, periodic, ground calculation and upload of such data. By manipulating the star catalog, or sub-catalogs derived from said catalog, based upon the exclusion list (), measurements of such excluded stars are prevented from corrupting the attitude or angular velocity or alignment estimates formulated on board.

US Patent:

7228231, Jun 5, 2007

Filed:

Apr 29, 2004

Appl. No.:

10/709348

Inventors:

David D. Needelman - Torrance CA, US
Richard A. Fowell - Rolling Hills Estates CA, US
Peter C. Lai - Alhambra CA, US
Rongsheng Li - Hacienda Heights CA, US

Assignee:

The Boeing Company - Chicago IL

International Classification:

G01C 21/00
B64G 1/10

US Classification:

701222, 701 4, 701226, 2441584

Abstract:

A vehicle () including a control system () is used for controlling vehicle attitude or angular velocity (). The processor () is coupled to a star sensor or tracker () and a memory () that may include a star catalog (), and an exclusion list (). The exclusion list (), a list of stars to be temporarily excluded from consideration when determining attitude or angular velocity or relative alignment of star sensors or trackers, is calculated on board. Such a calculation prevents the necessity for a costly, periodic, ground calculation and upload of such data. By manipulating the star catalog, or sub-catalogs derived from said catalog, based upon the exclusion list (), measurements of such excluded stars are prevented from corrupting the attitude or angular velocity or alignment estimates formulated on board. The system uses multiple stayout zones for excluding stars from the exclusion list. A central exclusion zone excludes all stars while a second or more exclusion zones allow some stars to be used in the attitude determination.

US Patent:

7310578, Dec 18, 2007

Filed:

Jun 24, 2004

Appl. No.:

10/710177

Inventors:

James P. Alstad - Palos Verdes Estate CA, US
David D. Needelman - Torrance CA, US
Rongsheng Li - Hacienda Heights CA, US
Richard A. Fowell - Rolling Hills Estates CA, US
Peter C. Lai - Alhambra CA, US

Assignee:

The Boeing Company - Chicago IL

International Classification:

G06F 7/76

US Classification:

701222, 244164

Abstract:

A system () includes: a) A vehicle () includes an attitude or angular velocity control system (), a plurality of star trackers or star sensors () each having a field of view (); b) a memory () having a star catalog (), a star pair catalog () and a reference table () stored therein; and c) a processor () coupled to the attitude or angular velocity control system (), the star trackers or star sensors (), and the memory (). The processor () determines the vehicle inertial attitude or angular velocity or sensor alignment, based, in part, on the star pair catalog () and reference table (). The design of the star pair catalog () and reference table () is suitable for rapid determination of attitude or angular velocity or sensor alignment, and an efficient use of memory.