Patent
1997-01-22
1998-08-11
Heckler, Thomas M.
G06F 112
Patent
active
057940193
ABSTRACT:
A processor clock (302) is momentarily synchronized to a subsystem clock (307) during transfers of data between a processor (301) and a subsystem (305). After the completion of the data transfer, synchronization is disabled and the processor clock runs asynchronously at its own internal frequency, which is higher than the subsystem clock frequency. In one embodiment, the processor clock uses a free running ring oscillator (401) that is constructed on the same integrated circuit chip as the processor. Changes in temperature and power supply voltage not only cause changes in the maximum operating speed of the processor, but they also cause corresponding changes in the frequency of the processor clock. Thus, the frequency of the processor clock tracks changes in the maximum operating speed of the processor caused by temperature and power supply variations.
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Genduso Thomas Basilio
Mosley Joseph Michael
Heckler Thomas M.
International Business Machines Corp.
McKinley Martin J.
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