James E Farmer

US Patent:

6473844, Oct 29, 2002

Filed:

Apr 29, 2000

Appl. No.:

09/562595

Inventors:

James C. Farmer - Sunnyvale CA
Kent A. Dickey - Westford MA

Assignee:

Hewlett-Packard Company - Palo Alto CA

International Classification:

G06F 1200

US Classification:

711164, 711156

Abstract:

A system and method is described in which protected memory writes are achieved in single transaction without leaving open a window in time for erroneous data to corrupt space in a target register. A single data packet preferably includes both user data to be written to a target storage device or location as well as the key data for authorizing the writing of such user data. Key data is preferably calculated by manipulating user data contained in the same packet or transmission thereby simplifying a verification process conducted the controller associated with target storage location.

US Patent:

6658543, Dec 2, 2003

Filed:

Sep 19, 2002

Appl. No.:

10/247098

Inventors:

James C. Farmer - Sunnyvale CA
Kent A. Dickey - Westford MA

Assignee:

Hewlett-Packard Development Company, L.P. - Houston TX

International Classification:

G06F 1200

US Classification:

711164, 711156

Abstract:

A system and method for protecting memory space in a target storage device during a write operation in a computer system, comprising creating a single data packet, including user data that is to be written to said target storage device and key data that is used to establish authorization to store said user data; transmitting said single data packet to the target storage device; determining whether said key data is valid; writing said user data into said target storage device only when said key data is valid.

US Patent:

6715093, Mar 30, 2004

Filed:

Apr 28, 2000

Appl. No.:

09/560194

Inventors:

James C. Farmer - Sunnyvale CA
Kent A. Dickey - Westford MA

Assignee:

Hewlett-Packard Development Company, L.P. - Houston TX

International Classification:

G06F 112

US Classification:

713400, 713500

Abstract:

A method and apparatus are disclosed for allowing a system having multiple clock domains to be put into a known state to ensure repeatability during debugging tests. A global framing clock is created having a frequency equal to the lowest common denominator of all clocks in the system or to some divisor of thereof. At this frequency, the global framing clock ensures that it will have a rising edge at the same time that other clocks in the system have rising edges. The system clock and the global framing clock may be run throughout the system to integrated circuits. The global framing clock is used to control a system function, such as a reset or an interrupt function. When the system receives an asynchronous event, the global framing clock ensures that the event is not distributed to the system until the occurrence of a rising edge of the global framing clock. This ensures that the event will also be seen on a rising edge of every other system clock, which makes the event appear at the same time throughout the system. By ensuring that an asynchronous function, such as a reset function, appears at the same time throughout the system, the system becomes repeatable.

US Patent:

6725369, Apr 20, 2004

Filed:

Apr 28, 2000

Appl. No.:

09/560192

Inventors:

James C. Farmer - Sunnyvale CA
Kent A. Dickey - Westford MA

Assignee:

Hewlett-Packard Development Company, L.P. - Houston TX

International Classification:

G06F 700

US Classification:

713100, 710 65, 712300

Abstract:

A circuit for reconfiguring data into the particular data format for processors and system memory when operating in a particular dual-data format processing environment. The circuit uses an interface having read and write multiplexers to swap data bytes automatically, transforming data between big and little endian formats, based upon a control signal.

US Patent:

20040059885, Mar 25, 2004

Filed:

Sep 24, 2003

Appl. No.:

10/669784

Inventors:

James Farmer - Sunnyvale CA, US
Kent Dickey - Westford MA, US

International Classification:

G06F012/16

US Classification:

711/164000

Abstract:

A system and method for protecting memory space in a target storage device during a write operation in a computer system, comprising creating a single data packet, including user data that is to be written to said target storage device and key data that is used to establish authorization to store said user data; transmitting said single data packet to the target storage device; determining whether said key data is valid; writing said user data into said target storage device only when said key data is valid.

US Patent:

20040158760, Aug 12, 2004

Filed:

Feb 6, 2004

Appl. No.:

10/772274

Inventors:

James Farmer - Sunnyvale CA, US
Kent Dickey - Westford MA, US

International Classification:

G06F001/04

US Classification:

713/500000

Abstract:

A method and apparatus are disclosed for allowing a system having multiple clock domains to be put into a known state to ensure repeatability during debugging tests. A global framing clock is created having a frequency equal to the lowest common denominator of all clocks in the system or to some divisor of thereof. At this frequency, the global framing clock ensures that it will have a rising edge at the same time that other clocks in the system have rising edges. The system clock and the global framing clock may be run throughout the system to integrated circuits. The global framing clock is used to control a system function, such as a reset or an interrupt function. When the system receives an asynchronous event, the global framing clock ensures that the event is not distributed to the system until the occurrence of a rising edge of the global framing clock. This ensures that the event will also be seen on a rising edge of every other system clock, which makes the event appear at the same time throughout the system. By ensuring that an asynchronous function, such as a reset function, appears at the same time throughout the system, the system becomes repeatable. That is, the clock states will be the same every time an asynchronous event is released to the system.