Bernard L Stewart

US Patent:

6370495, Apr 9, 2002

Filed:

Feb 2, 1999

Appl. No.:

09/241578

Inventors:

Eugene Weddle - San Jose CA
Roy Wen - San Jose CA
Bernard E. Stewart - Fremont CA

Assignee:

Oak Technology - Sunnyvale CA

International Classification:

G06F 1750

US Classification:

703 19, 703 15, 716 6, 714814

Abstract:

The present invention simulates the behavior of a storage component by first determining whether a timing violation has occurred for the storage component. If one or more timing violations is detected, then an x (indicating uncertainty) is reflected at the output of the storage component. This x is maintained at the output of the storage component for a predetermined number of timing units. After the predetermined number of timing units has expired, the output of the storage component is changed from x to a certain value, such as a logical 1 or a logical 0. By changing the output to a certain value, the present invention prevents the x at the output of the storage component from indefinitely propagating to other components in the circuit. This in turn prevents large numbers of xs from appearing in the simulation results provided to the designer. Instead, values that are certain will appear in the results.

US Patent:

51425386, Aug 25, 1992

Filed:

Apr 19, 1990

Appl. No.:

7/511333

Inventors:

Stanley L. Fickes - San Jose CA
Bernard E. Stewart - Campbell CA
Robert J. Grady - Windsor CA
Rick L. Reagan - Santa Clara CA
John Piccone - San Jose CA
Richard C. Allen - Los Gatos CA

Assignee:

Photonics Corporation - Campbell CA

International Classification:

G08C 2502
H04L 114

US Classification:

371 34

Abstract:

An infrared RS 232 communication link protocol is particularly suited for correcting any errors introduced during a transmission of information. The information is transmitted from a transmitting station to a receiving station. Each of the stations has a control counter each of which toggles between a logic 0 and 1. The control counter for the transmitter and the receiver are phase locked so that all errors may be corrected. The receiver echoes each data bit back to the transmitter which compares the echoed data to the transmitted data. If there is a match, the transmission was successful. If there is no match, the data must be retransmitted. A retransmit control character RTXx is sent to indicate that the receiver should discard the previous character and prepare for a retransmission of the character having the error. Under the proper circumstances and if the counters are still phase locked, the receiver then discards the previously stored character and inverts the counter. If the receiver detects that it has received an erroneous character, such as one having multiple or no PPM pulses, the receiver will simply respond with the reject control character REJ.

US Patent:

55637280, Oct 8, 1996

Filed:

Feb 22, 1991

Appl. No.:

7/659501

Inventors:

Richard C. Allen - Los Gatos CA
Gary M. Cisneros - San Jose CA
Stanley L. Fickes - San Jose CA
Gary N. Hughes - Portola Valley CA
Walter S. Johnson - San Jose CA
James L. Konsevich - San Jose CA
John Piccone - San Jose CA
Bernard E. Stewart - Fremont CA

International Classification:

H04B 1000

US Classification:

359172

Abstract:

A diffuse infrared communication link provides for communication directly between nodes each having a transceiver. A repeater may be present to facilitate communication. Each node is automatically reconfigurable between operation with or without a repeater. When a repeater is present each node automatically ignores any transmission by another node.

US Patent:

51192268, Jun 2, 1992

Filed:

Mar 30, 1989

Appl. No.:

7/331607

Inventors:

Richard C. Allen - Los Gatos CA
Robert J. Grady - Windsor CA
Louis R. Janis - Campbell CA
John Piccone - San Jose CA
Bernard E. Stewart - Campbell CA

Assignee:

Photonics Corporation - Campbell CA

International Classification:

H04B 1010
H04J 1408

US Classification:

359172

Abstract:

The present invention is for a radiation transmitter which transmits radiation to an illumination spot for forming reflected radiation. The transmitter includes a plurality of radiation transmission sources. Each of the sources transmits to a portion of the illumination spot. The transmitter includes means for alternately activating a portion of the transmission sources to illuminate a portion of the illumination spot for aligning a radiation receiver to receive the reflected radiation. Each resident of network transmits in turn its address and the address of each resident that it recognizes. Once a prospective resident can recognize each resident of the network it announces that it is joining the network and states its new address and the address of each resident it can see. Every resident then amends its list of recognized residents to include the new member.

US Patent:

52454606, Sep 14, 1993

Filed:

Jun 2, 1992

Appl. No.:

7/892221

Inventors:

Richard C. Allen - Los Gatos CA
Robert J. Grady - Windsor CA
Louis R. Janis - Campbell CA
John Piccone - San Jose CA
Bernard E. Stewart - Campbell CA

Assignee:

Photonics Corporation - San Jose CA

International Classification:

H04B 1010

US Classification:

359155

Abstract:

The present invention is for a radiation transmitter which transmits radiation to an illumination spot for forming reflected radiation. The transmitter includes a plurality of radiation transmission sources. Each of the sources transmits to a portion of the illumination spot. The transmitter includes means for alternately activating a portion of the transmission sources to illuminate a portion of the illumination spot for aligning a radiation receiver to receive the reflected radiation. Each resident of network transmits in turn its address and the address of each resident that it recognizes. Once a prospective resident can recognize each resident of the network it announces that it is joining the network and states its new address and the address of each resident it can see. Every resident then amends its list of recognized residents to include the new member.

US Patent:

53846524, Jan 24, 1995

Filed:

Jan 6, 1993

Appl. No.:

8/000970

Inventors:

Richard C. Allen - Los Gatos CA
Gary M. Cisneros - San Jose CA
Stanley L. Fickes - San Jose CA
Gary N. Hughes - Portola Valley CA
Walter S. Johnson - San Jose CA
James L. Konsevich - San Jose CA
John Piccone - San Jose CA
Bernard E. Stewart - Fremont CA

Assignee:

Photonics Corporation - San Jose CA

International Classification:

H04B 1000
H04B 1002

US Classification:

359172

Abstract:

A diffuse infrared communication link provides for communication directly between nodes each having a transceiver. A repeater may be present to facilitate communication. Each node is automatically reconfigurable between operation with or without a repeater. When a repeater is present each node automatically ignores any transmission by another node.