United States Patent 7,171,528
Evans, et al. January 30, 2007
Evans, et al. January 30, 2007
Method and apparatus for generating a write mask key
Abstract
A method and apparatus provides a mask key that is used instead of mask data. In an embodiment of the present invention, a write mask key is generated by a memory controller and transferred to a memory device that uses the write mask key to determine whether to write a data value to a storage array. A plurality of decoders, an OR logic gate tree and a binary propagation tree is used to provide the write mask key that reduces latency while using the approximate same circuit area and allows for the use of standard software tools in an embodiment of the present invention. A plurality of log.sub.2 decoders is coupled to a plurality of OR logic gates in the OR logic gate tree.
Inventors: Evans; Marc (San Jose, CA), Perego; Richard E. (Thornton, CO), Ware; Frederick A. (Los Altos Hills, CA)
Assignee: Rambus Inc. (Los Altos, CA)
Appl. No.: 10/896,167
Filed: July 21, 2004
Assignee: Rambus Inc. (Los Altos, CA)
Appl. No.: 10/896,167
Filed: July 21, 2004
***
United States Patent 7,171,321
Best January 30, 2007
Best January 30, 2007
Individual data line strobe-offset control in memory systems
Abstract
Systems and methods for strobe signal timing calibration and control in strobe-based memory systems are provided below. These strobe-offset control systems and methods receive a strobe signal from a memory device and in turn automatically generate separate per-bit strobe signals for use in receiving data on each data line of a memory system. The systems/methods generate the optimal per-bit strobe signals by automatically calibrating per-bit offset timing between data signals of individual data bits and corresponding strobe signals. The strobe-offset control system effectively removes the detected phase difference between the data signal and the strobe signal.
Systems and methods for strobe signal timing calibration and control in strobe-based memory systems are provided below. These strobe-offset control systems and methods receive a strobe signal from a memory device and in turn automatically generate separate per-bit strobe signals for use in receiving data on each data line of a memory system. The systems/methods generate the optimal per-bit strobe signals by automatically calibrating per-bit offset timing between data signals of individual data bits and corresponding strobe signals. The strobe-offset control system effectively removes the detected phase difference between the data signal and the strobe signal.
Inventors: Best; Scott C. (Palo Alto, CA)
Assignee: Rambus Inc. (Los Altos, CA)
Appl. No.: 10/923,421
Filed: August 20, 2004
Assignee: Rambus Inc. (Los Altos, CA)
Appl. No.: 10/923,421
Filed: August 20, 2004
***
United States Patent 7,170,314
Haba, et al. January 30, 2007
Haba, et al. January 30, 2007
Multiple channel modules and bus systems using same
Abstract
Various module structures are disclosed which may be used to implement modules having 1 to N channels. Bus systems may be formed by the interconnection of such modules.
Various module structures are disclosed which may be used to implement modules having 1 to N channels. Bus systems may be formed by the interconnection of such modules.
Inventors: Haba; Belgacem (Cupertino, CA), Perego; Richard E. (San Jose, CA), Nguyen; David (San Jose, CA), Garrett, Jr.; Billy W. (Mountain View, CA), Tsern; Ely (Los Altos, CA), Hampel; Crag E. (San Jose, CA), Yip; Wai-Yeng (San Jose, CA)
Assignee: Rambus Inc. (Los Altos, CA)
Appl. No.: 11/054,955
Filed: February 11, 2005
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