Servo controller interface module for embedded disk controllers
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United States of America Patent
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Jan 11, 2011
Grant Date -
Sep 30, 2004
app pub date -
Mar 9, 2004
filing date -
Mar 10, 2003
priority date (Note) -
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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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