Electrical computers and digital data processing systems: input/ – Intrasystem connection – Bus access regulation
Reexamination Certificate
2005-09-20
2005-09-20
Vo, Tim (Department: 2112)
Electrical computers and digital data processing systems: input/
Intrasystem connection
Bus access regulation
C710S105000, C713S501000
Reexamination Certificate
active
06948017
ABSTRACT:
In one form, a method for communicating among subsystems coupled to a bus of a computer system on an integrated circuitry chip includes operating subsystems at independent clock frequencies when the subsystems are not communicating with one another on the bus. Selected pairs of the subsystems are operated at a shared clock frequency by selectively varying frequencies of clock signals to the subsystems, so that communication can occur at the shared clock frequency on the bus between the selected subsystems, but at different clock frequencies for respective different pairings of the subsystems, and so that the subsystems can operate at independent clock frequencies when not communicating with other ones of the subsystems. Communication among the subsystems is by a bus-based protocol, according to which when a subsystem is granted access to the bus the subsystem has exclusive use of the bus.
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Carpenter Gary Dale
Chandra Vikas
England Anthony V S
International Business Machines - Corporation
Salys Casimer K.
Vo Tim
Vu Trisha
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