Rambus Inc. - Two more patents

United States Patent 7,043,599

Ware, et al. May 9, 2006

Dynamic memory supporting simultaneous refresh and data-access transactions

Abstract
Described are dynamic memory systems that perform overlapping refresh and data-access (read or write) transactions that minimize the impact of the refresh transaction on memory performance. The memory systems support independent and simultaneous activate and precharge operations directed to different banks. Two sets of address registers enable the system to simultaneously specify different banks for refresh and data-access transactions.

Inventors: Ware; Frederick A. (Los Altos Hills, CA); Perego; Richard E. (San Jose, CA)

Assignee:Rambus Inc. (Los Altos, CA)

Appl. No.: 268808

Filed: October 9, 2002

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United States Patent 7,042,914

Zerbe, et al. May 9, 2006

Calibrated data communication system and method

Abstract
A system includes a first integrated circuit device and a second integrated circuit device. The first device transmits a data sequence to the second integrated circuit device, and the second device samples the data sequence to produce receiver data. The second device then transmits the receiver data back to the first device. Within the first integrated circuit device, a comparison between the data sequence and the receiver data is performed, and based on the comparison, the first device generates information representative of a calibrated timing offset. The first device uses the information representative of the calibrated timing offset to adjust timing associated with transferring write data from the first integrated circuit to the second integrated circuit.

Inventors: Zerbe; Jared LeVan (Woodside, CA); Donnelly; Kevin S. (Los Altos, CA); Sidiropoulos; Stefanos (Palo Alto, CA); Stark; Donald C. (Los Altos, CA); Horowitz; Mark A. (Menlo Park, CA); Yu; Leung (Los Altos, CA); Vu; Roxanne (San Jose, CA); Kim; Jun (Redwood City, CA); Garlepp; Bruno W. (Sunnyvale, CA); Ho; Tsyr-Chyang (San Jose, CA); Lau; Benedict Chung-Kwong (San Jose, CA)

Assignee: Rambus Inc. (Los Altos, CA)

Appl. No.: 684618

Filed: October 13, 2003

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