Electrical computers and digital processing systems: memory – Storage accessing and control – Shared memory area
Reexamination Certificate
2011-01-11
2011-01-11
Thomas, Shane M (Department: 2186)
Electrical computers and digital processing systems: memory
Storage accessing and control
Shared memory area
C711S112000, C711S152000, C710S244000
Reexamination Certificate
active
07870346
ABSTRACT:
An embedded disk controller (“controller”) having a servo controller is provided. The controller also includes a servo controller interface with a speed matching module and a pipeline control module such that at least two processors share memory mapped registers without conflicts. The processors operate at different frequencies, while the servo-controller and the servo controller interface operate in same or different frequency domains. The pipeline control module resolves conflict between the first and second processor transaction. The speed matching module ensures communication without inserting wait states in a servo controller interface clock domain for write access to the servo controller and there is no read conflicts between the first and second processor. The controller also includes a hardware mechanism for indivisible register acess to the first or second processor. The hardware mechanisim includes a hard semaphore and/or soft semaphore.
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Byers Larry L.
Purdham David M.
Spaur Michael R.
Marvell International Ltd.
Thomas Shane M
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