Gerald M Marx

20090177816, Jul 9, 2009

Jan 4, 2008

11/969367

Gerald Marx - San Diego CA, US
Jun Guo - San Diego CA, US

G06F 13/12

710 72

The disclosed systems and methods relate to a reduction of system complexity by incorporating a clock cut-off signal in an SDIO device in order to support a multi-drop architecture. Aspects of the present invention enable a multi-drop architecture with an SDIO device and multiple SD memory devices sharing the same SD bus. Aspects of the present invention may also reduce host complexity by enabling a single host to control an SD device and multiple SD memory cards.

6725067, Apr 20, 2004

Mar 24, 2000

09/536066

Gerald Marx - San Diego CA
Der-Chieh Koon - Encinitas CA

International Business Machines Corporation - Armonk NY

H04Q 720

455574, 4553432

The present invention is a method and system to minimize the timing errors introduced by the use of a sleep clock, utilized in timing a sleep period, for a mobile station. Further, the present invention restarts a high frequency reference clock after the sleep period with a zero mean time error to ensure that the receiver of the mobile station is properly synchronized with a base station for the receipt of pages. A low frequency sleep clock is calibrated with respect to a high frequency reference clock during a pre-defined calibration period. Based upon the calibration, a calibration error for the sleep clock is determined. Next, a wake-up time error is calculated, based upon the calibration error, to compensate for the error of the sleep clock. The wake-up time error compensates for the error of the sleep clock during the sleep period such that the reference clock restarts at the end of the sleep period with a zero mean time error. This ensures that the reference clock and the receiver of the mobile station will be properly time synchronized with the base station for the receipt of pages.