David Cheonho Chung

US Patent:

6363067, Mar 26, 2002

Filed:

Mar 19, 1999

Appl. No.:

09/272829

Inventors:

David Chung - Sunnyvale CA

Assignee:

Sony Corporation - Tokyo
Sony Electronics, Inc. - Park Ridge NJ

International Classification:

H04L 1250

US Classification:

370364, 370408, 370402

Abstract:

A staged partitioned communication bus for interconnecting the ports of a multi-port bridge for a local area network. The communication bus is partitioned into a plurality of data bus segments. Each data bus segment is coupled to one or more ports of the multi-port bridge and includes a same number of signal lines. A multiplexer is coupled to each data bus segment and to a memory device. A bus controller is coupled to each port and to the multiplexer. Each port requests access to the memory device from the bus controller for storing packets in the memory device and for retrieving packets therefrom. In response, the bus controller conditions the multiplexer to provide a signal path between the memory device to and the data bus segment which includes the requesting port. The memory device temporarily stores packets undergoing communication between the ports. Accordingly, a source port for a packet transfers the packet to the memory device via the multiplexer and, then, a destination port for the packet retrieves the packet from the memory device via the multiplexer.

US Patent:

6611377, Aug 26, 2003

Filed:

Jul 10, 2000

Appl. No.:

09/613119

Inventors:

David B. Chung - Cupertino CA

Assignee:

Intel Corporation - Santa Clara CA

International Classification:

G02B 518

US Classification:

359572, 359569, 359573, 359223, 359224, 359290, 359291, 359900, 345 85, 345108

Abstract:

A micromechanical reflection phase grating may be formed of spring-like ribbon reflectors that are secured to a transparent cover positioned over a substrate such as a silicon substrate. The ribbon reflectors are formed independently of the silicon substrate. If a defect occurs in the phase grating and particularly the ribbon reflectors, the top plate assembly can be reworked or discarded without sacrificing the relatively expensive silicon substrate.

US Patent:

6617879, Sep 9, 2003

Filed:

Mar 19, 1999

Appl. No.:

09/272894

Inventors:

David Chung - Sunnyvale CA

Assignee:

Sony Corporation - Tokyo
Sony Electronics Inc. - Park Ridge NJ

International Classification:

H03K 19173

US Classification:

326 82, 326 38, 370401, 370413

Abstract:

A transparently partitioned communication bus for interconnecting the ports of a multi-port bridge for a local area network. The communication bus is partitioned into a plurality of bus segments, each segment coupled to one or more ports of the multi-port bridge and including a same number (n) of signal lines. A controller pre-charges each signal line to a logic high voltage level by activating pre-charge transistors coupled between a voltage supply and a plurality of diodes, each diode coupled to a corresponding one of the signal lines. The pre-charging operation includes all the signal lines. The ports request access to the partitioned bus. A port having been granted access to the partitioned bus applies data to its associated bus segment. The transparent controller then senses the data applied by the port via sense lines. Then, the transparent controller replicates this data to each other bus segment by discharging appropriate ones of the signal lines of each other bus segment via appropriate ones of a plurality of discharge transistors.

US Patent:

6642987, Nov 4, 2003

Filed:

Sep 19, 2001

Appl. No.:

09/956626

Inventors:

David B. Chung - Cupertino CA
Michael Kozhukh - Palo Alto CA
Sergei Rutman - Boulder Creek CA

Assignee:

Intel Corporation - Santa Clara CA

International Classification:

G02F 11339

US Classification:

349155, 349113, 349156

Abstract:

Liquid crystal on silicon (LCOS) cells include a plurality of pixel elements formed between substrates. Spacers are formed on a portion of some of the pixel elements and positioned in the cell gap. The spacers on each of these LCOS cells reflecting different colors are formed in different locations in each cell. The result is that substantially none of the spacers create overlapping dead spots in a composite image. The spacers are further distributed among these pixel elements such that spacers are absent from some pixel elements and such that there is a substantially uniform thickness in the cell gaps. The reduced severity of the dead spots in the composite image as a result of the spacers in different locations, the reduced size and number of the spacers, and the uniformity in the cell gaps provide higher optical image quality.

US Patent:

6738384, May 18, 2004

Filed:

Mar 19, 1999

Appl. No.:

09/272833

Inventors:

David Chung - Sunnyvale CA

Assignee:

Sony Corporation - Tokyo
Sony Electronics Inc. - Park Ridge NJ

International Classification:

H04L 1256

US Classification:

370412, 370401

Abstract:

A technique for optimizing cut-through for broadcast and multi-cast data packets in a multi-port bridge for a local area network (LAN). The multi-port bridge includes a plurality of ports for communicating packets with an associated segment of the LAN. Each of the ports is coupled to a data bus for communicating packets among the ports. A packet buffer is coupled to the data bus for temporarily storing packets undergoing communication between the ports. At least one of the ports includes a transmit packet store for receiving packets to be transmitted by the port and a broadcast packet store for receiving broadcast and multi-cast packets to be transmitted by the port wherein the broadcast packet store receives a broadcast or multi-cast packet only when the transmit packet store is occupied. The transmit packet store can receive a packet from the packet buffer or at the same time the packet buffer receives the packet. Because the broadcast packet store receives the broadcast or multi-cast packet from the data bus at the same time the packet buffer receives it, even when the transmit packet store is occupied, the invention minimizes the number of ports which need to retrieve such a broadcast or multi-cast packet from the packet buffers.

US Patent:

6744728, Jun 1, 2004

Filed:

Mar 19, 1999

Appl. No.:

09/273134

Inventors:

David Chung - Sunnyvale CA

Assignee:

Sony Corporation Sony Electronics, Inc. - Park Ridge NJ

International Classification:

H04J 314

US Classification:

370229, 370401

Abstract:

A method of optimizing a data path in a multi-port bridge for a local area network (LAN) includes steps of: identifying a data path through the multi-port bridge wherein the data path includes a plurality of stages in a serial arrangement, wherein each stage performs a corresponding operation on data received from the LAN by the multi-port bridge; identifying a stage in the data path wherein the identified stage requires a period of time to perform its corresponding operation which is longer than any other stage; and subdividing the identified stage into two or more subdivided stages wherein the operations performed by the subdivided stages collectively perform the operation associated with the identified stage and wherein each of the two or more subdivided stages requires a period of time to perform its corresponding operation which is shorter than the period of time required for the identified stage to perform its corresponding operation. The method can include determining a bandwidth required for the multi-port bridge; and determining a frequency for a clock signal based upon the bandwidth. The method can also include repeatedly subdividing selected stages until a slowest stage in the data path is operable according to the clock signal.

US Patent:

6751225, Jun 15, 2004

Filed:

Mar 19, 1999

Appl. No.:

09/272846

Inventors:

David Chung - Sunnyvale CA

Assignee:

Sony Corporation - Tokyo
Sony Electronics Inc. - Park Ridge NJ

International Classification:

H04L 1256

US Classification:

370401

Abstract:

The invention is a port in a multi-port bridge for a local area network having a vector buffer for storing vectors relating to the routing of data packets received in the port. The bridge includes a plurality of ports coupled a data bus and to a look-up bus. A look-up table coupled to the look-up bus correlates destination node addresses from each packet to an appropriate destination port. In addition, a packet buffer is coupled to the data bus for temporarily storing data packets. When a packet is received into a receive buffer of a source port, a destination and source address included in the packet are utilized to update the look-up table and to identify the appropriate destination port for the packet. This is preferably performed by the source port communicating with the look-up table via the look-up bus. Once the destination port has been identified, the identification of the destination port is stored in the receive vector for the packet.

US Patent:

6774955, Aug 10, 2004

Filed:

Jul 15, 2003

Appl. No.:

10/620722

Inventors:

David B. Chung - Cupertino CA
Michael Kozhukh - Palo Alto CA
Sergei Rutman - Boulder Creek CA

Assignee:

Intel Corporation - Santa Clara CA

International Classification:

G02F 11339

US Classification:

349 5, 349156, 349113, 349114

Abstract:

Liquid crystal on silicon (LCOS) cells include a plurality of pixel elements formed between substrates. Spacers are formed on a portion of some of the pixel elements and positioned in the cell gap. The spacers on each of these LCOS cells reflecting different colors are formed in different locations in each cell. The result is that substantially none of the spacers create overlapping dead spots in a composite image. The spacers are further distributed among these pixel elements such that spacers are absent from some pixel elements and such that there is a substantially uniform thickness in the cell gaps. The reduced severity of the dead spots in the composite image as a result of the spacers in different locations, the reduced size and number of the spacers, and the uniformity in the cell gaps provide higher optical image quality.