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United States Patent 6,968,024

Perino November 22, 2005

Apparatus and method for operating a master-slave system with a clock signal and a separate phase signal

Abstract
A master-slave system includes a clock and phase signal generator to produce a clock signal at a given frequency and a phase signal at an effective frequency, where the phase signal may or may not be periodic and has an effective frequency less than the given frequency. A clock line is connected to the clock and phase signal generator to carry the clock signal. A phase line is connected to the clock and phase signal generator to carry the phase signal. The phase line includes a phase-to-master path to carry a phase-to-master phase signal and a phase-from-master path to carry a phase-from-master phase signal. A master device is connected to the clock line and the phase line. A data bus is connected to the master device. A slave device is connected to the data bus, the clock line and the phase line. The slave device processes data on the data bus in response to the clock signal and the phase signal.

Inventors: Perino; Donald V. (North Potomac, MD)

Assignee: Rambus Inc. (Los Altos, CA)

Appl. No.: 629862

Filed: August 1, 2000


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United States Patent 6,967,514

Kizer November 22, 2005

Method and apparatus for digital duty cycle adjustment

Abstract
Adjusting a clock duty cycle. An incremental error signal is generated in response to the clock signal. A cumulative error signal is generated in response to the incremental error signal. The incremental error signal is reset and the duty cycle of the clock signal is adjusted in response to the cumulative error signal.

Inventors:
Kizer; Jade M. (Mountain View, CA); Vu; Roxanne T. (San Jose, CA)

Assignee:
Rambus, Inc. (Los Altos, CA)

Appl. No.: 277738

Filed: October 21, 2002

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