Michael R Carlson

US Patent:

6571321, May 27, 2003

Filed:

Jul 27, 2001

Appl. No.:

09/917432

Inventors:

Joseph B. Rowlands - Santa Clara CA
Michael D. Carlson - Mountain View CA

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

G06F 1200

US Classification:

711141, 711146

Abstract:

An agent, in response to a write to a shared block, is configured to initiate a read exclusive transaction on an interface on which the agent communicates. Additionally, the agent is configured to indicate, to a responding agent or agents on the interface, that a data transfer is not required from the responding agent or agents in response to the read exclusive transaction. In one embodiment, the agent indicates to the responding agents that a data transfer is not required in a response phase of the transaction. Specifically, the agent may respond in such a way that the agent indicates that it will provide the data (i. e. that the agent will provide the data to itself). For example, the agent may respond with an exclusive ownership indication. On the interface for such an embodiment, an exclusive ownership response may require that the agent having exclusive access respond with the data.

US Patent:

6640288, Oct 28, 2003

Filed:

Apr 8, 2003

Appl. No.:

10/409508

Inventors:

Joseph B. Rowlands - Santa Clara CA
Michael D. Carlson - Mountain View CA

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

G06F 1200

US Classification:

711141, 711146, 711124

Abstract:

An agent, in response to a write to a shared block, is configured to initiate a read exclusive transaction on an interface on which the agent communicates. Additionally, the agent is configured to indicate, to a responding agent or agents on the interface, that a data transfer is not required from the responding agent or agents in response to the read exclusive transaction. In one embodiment, the agent indicates to the responding agents that a data transfer is not required in a response phase of the transaction. Specifically, the agent may respond in such a way that the agent indicates that it will provide the data (i. e. that the agent will provide the data to itself). For example, the agent may respond with an exclusive ownership indication. On the interface for such an embodiment, an exclusive ownership response may require that the agent having exclusive access respond with the data.

US Patent:

62667610, Jul 24, 2001

Filed:

Jun 12, 1998

Appl. No.:

9/096836

Inventors:

Michael David Carlson - Mountain View CA
Thomas Alan Hoy - Austin TX
Terence Matthew Potter - Austin TX
David Domenic Putti - Austin TX

Assignee:

International Business Machines Corporation - Armonk NY
Motorola, Inc. - Schaumburg IL

International Classification:

G06F 1500

US Classification:

712 23

Abstract:

A method and system in an information processing system are disclosed for efficiently maintaining copies of values stored within a plurality of registers. The information processing system includes first circuitry, second circuitry, and a plurality of buffers. The first circuitry processes an execution state of a first type of instruction which always specifies a destination of at least one of a first type of register or a second type of register, and which outputs first information in response thereto. The first circuitry also processes an execution stage of a second type of instruction which always specifies a destination of only a third type of register, and outputs second information in response thereto. The plurality of buffers are coupled to the execution circuitry for storing the output first and second information, wherein at least one of the buffers is for storing the output first information independent of which of the first and second types of registers is specified by the first type of instruction. The second circuitry is coupled to the buffers for processing a completion stage of the first type of instruction, and writing the stored first information into at least one of the first or a second type of register in response thereto.