Jonathan S Chang

US Patent:

6580072, Jun 17, 2003

Filed:

May 3, 2000

Appl. No.:

09/564058

Inventors:

Jonathan Cheang-Whang Chang - Mountain View CA
Brian J. Wollard - San Jose CA

Assignee:

Xilinx, Inc. - San Jose CA

International Classification:

H01J 37304

US Classification:

250297, 2504922, 25049221, 250398, 250309, 438618, 438620, 438768, 257700, 257701, 257706

Abstract:

Described are methods of adapting FIB techniques to copper metallization, and to structures that result from the application of such techniques. A method in accordance with the invention can be used to sever copper traces without damaging adjacent material or creating conductive bridges to adjacent traces. Semiconductor devices that employ copper traces typically include a protective passivation layer that protects the copper. This passivation layer is removed to render the copper traces visible to an FIB operator. The copper surface is then oxidized, as by heating the device in air, to form a copper-oxide layer on the exposed copper. With the copper-oxide layer in place, an FIB is used to mill through the copper-oxide and copper layers of a selected copper trace to sever the trace. The copper-oxide layer protects copper surfaces away from the mill site from reactive chemicals used during the milling process. In one embodiment, a copper-oxide layer of at least 40 nanometers thick affords adequate protection.

US Patent:

7091077, Aug 15, 2006

Filed:

Jun 7, 2005

Appl. No.:

11/146514

Inventors:

David Kuan-Yu Liu - Fremont CA, US
Jonathan Cheang-Whang Chang - Mountain View CA, US

Assignee:

Xilinx, Inc. - San Jose CA

International Classification:

H01L 21/336

US Classification:

438197, 257E21327, 257E21623

Abstract:

Polysilicon or other material is directionally trimmed using two layers of photoresist and a photoresist etching process, such as ashing. A first layer of photoresist is patterned on a wafer. Portions of the first patterned photoresist are covered with a second layer of photoresist. The photoresist is trimmed to reduce the size of the exposed portions of the first patterned photoresist without reducing the size of the covered portions of the first patterned photoresist. The second layer of photoresist is removed. The selectively etched patterned first layer of photoresist is used as a process mask to define a structure in the underlying material. In a particular embodiment, the second photoresist covers endcap portions of gate photoresist. Directional trimming reduces the width of a polysilicon gate structure (i. e. gate length) over an active area of an FET, without reducing the length of original first patterned photoresist.

US Patent:

7635843, Dec 22, 2009

Filed:

Jul 13, 2007

Appl. No.:

11/827730

Inventors:

Yuhao Luo - San Jose CA, US
Jonathan Cheang-Whang Chang - Mountain View CA, US

Assignee:

Xilinx, Inc. - San Jose CA

International Classification:

G01N 23/00

US Classification:

250307, 250310, 324751, 324752, 324753

Abstract:

A method of testing a semiconductor wafer having a test structure performs an E-beam stress scan of the test structure in an E-beam system to electrically stress the test structure to produce a stress defect. An inspection scan is performed in the E-beam system to identify the stress defect.

US Patent:

7782859, Aug 24, 2010

Filed:

May 7, 2007

Appl. No.:

11/745078

Inventors:

Ming Zhang - San Jose CA, US
Ram Krisnan - Sunnyvale CA, US
Jonathan J. Chang - Cupertino CA, US
Flavio Giovanni Bonomi - Palo Alto CA, US

Assignee:

Cisco Technology, Inc. - San Jose CA

International Classification:

H04L 12/28
H04L 12/56
G06F 12/00

US Classification:

370392, 37039531, 711202, 711221

Abstract:

A method for classifying a data packet containing a header is provided. The method may comprise parsing the header of a data packet into header elements. Rules in secondary lookup tables generated from a primary lookup table may be accessed. The respective header elements of the data packet may be compared to the respective fields of each of the secondary lookup tables, and rule results for each of the secondary lookup tables in a combinable format may be generated. In another embodiment, a method for generating secondary lookup tables from a primary lookup table is provided. The method may comprise accessing a primary lookup table defining packet classification rules and generating multiple secondary lookup tables from the primary lookup table. For each secondary lookup table, a selection of classification rules and a selection of fields of the multiple fields based on a rule set identifying predefined entries may be extracted.

US Patent:

7813350, Oct 12, 2010

Filed:

Oct 23, 2006

Appl. No.:

11/551932

Inventors:

Sumeet Singh - Fremont CA, US
George Varghese - Sunnyvale CA, US
Flavio Giovanni Bonomi - Palo Alto CA, US
Jonathan J. Chang - Cupertino CA, US

Assignee:

Cisco Technology, Inc. - San Jose CA

International Classification:

H04L 12/28

US Classification:

37039532, 37039543

Abstract:

A method and device to process a packet received by a network device is described. The method may comprise analyzing the packet to identify at least one set of a plurality of sets, mapping the at least one set to at least one functional unit, and performing functionality associated with the at least one functional unit. Analyzing the packet to identify at least one of a plurality of sets may comprise determining when the packet includes at least one set identifier, and identifying the at least one set based on the at least one set identifier. A set status identifier may be defined for each set, the set status identifier indicating when set identifiers associated with a corresponding set are detected in the packet. The device may be a router, switch or any other device that processes digital data e. g. , packet data including packets headers, payload or the like.

US Patent:

7827384, Nov 2, 2010

Filed:

Jul 16, 2007

Appl. No.:

11/778151

Inventors:

Ming Zhang - San Jose CA, US
Jui-Yang Lu - Fremont CA, US
Jonathan J. Chang - Cupertino CA, US
Stephanie W. Ti - Fremont CA, US

Assignee:

Cisco Technology, Inc. - San Jose CA

International Classification:

G06F 12/00

US Classification:

711216

Abstract:

Various systems and methods for implementing a Galois-based incremental hash module are disclosed. For example, a method involves computing a first hash of a first string of an input stream. The first hash is computed by performing one or more Galois mathematical operations upon portions of the first string. A second hash of a second string, which overlaps the first string, can then be computed by processing the first hash.

US Patent:

7894358, Feb 22, 2011

Filed:

Mar 15, 2007

Appl. No.:

11/724911

Inventors:

Cecilia Martin - Morgan Hill CA, US
John Huber - San Diego CA, US
Mei Wang - Mountain View CA, US
Jonathan Chang - Cupertino CA, US
Flavio Bonomi - Palo Alto CA, US
Sumeet Singh - Fremont CA, US

Assignee:

Cisco Technology, Inc. - San Jose CA

International Classification:

H04L 12/26
H04L 12/28

US Classification:

370252, 370412

Abstract:

A device includes a multistage filter and an elephant trap. The multistage filter has hash functions and an array. The multistage filter is operable to receive a packet associated with a candidate heavy network user and send the packet to the hash functions. The hash functions generate hash function output values corresponding to indices in the array. The elephant trap is connected to the multistage filter. The elephant trap includes a buffer and probabilistic sampling logic. The probabilistic sampling logic is operable to attempt to add information associated with the packet to the buffer a particular percentage of the time based in part on the result of the multistage filter lookup. The buffer is operable to hold information associated with the packet, counter information, and timestamp information.

US Patent:

8139586, Mar 20, 2012

Filed:

Aug 20, 2010

Appl. No.:

12/860757

Inventors:

Ming Zhang - San Jose CA, US
Ram Krisnan - Sunnyvale CA, US
Jonathan J. Chang - Cupertino CA, US
Flavio Giovanni Bonomi - Palo Alto CA, US

Assignee:

Cisco Technology, Inc. - San Jose CA

International Classification:

H04L 12/28
H04L 12/56
G06F 9/26
G06F 9/34

US Classification:

37039531, 370392, 711202, 711221

Abstract:

A method for classifying a data packet containing a header is provided. The method may comprise parsing the header of a data packet into header elements. Rules in secondary lookup tables generated from a primary lookup table may be accessed. The respective header elements of the data packet may be compared to the respective fields of each of the secondary lookup tables, and rule results for each of the secondary lookup tables in a combinable format may be generated. In another embodiment, a method for generating secondary lookup tables from a primary lookup table is provided. The method may comprise accessing a primary lookup table defining packet classification rules and generating multiple secondary lookup tables from the primary lookup table. For each secondary lookup table, a selection of classification rules and a selection of fields of the multiple fields based on a rule set identifying predefined entries may be extracted.