Method and apparatus for enhanced phase alignment for direct...

Details Method and apparatus for enhanced phase alignment for direct... Method and apparatus for enhanced phase alignment for direct...

2005-01-04

2005-01-04

Faber, Alan T. (Department: 2651)

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

Reexamination Certificate

active

06839195

ABSTRACT:
A method and apparatus are provided for implementing improved phase alignment in a direct access storage device (DASD). A reference clock input is received for providing a system clock. Locking to a synchronization field of a readback signal is performed by adjusting the phase of the system clock. A timing mark is detected and then the adjusted phase of the system clock is held. Responsive to the detected timing mark, a reference delay of a predefined number and fraction of system clock periods is identified. At an end of the reference delay, a write circuit accepts data and generates write signals for a write operation. The phase of the system clock is adjusted corresponding to a predefined fractional delay and is used to run a programmable counter that counts the predefined number of system clock periods corresponding to the reference delay.

REFERENCES:
patent: 5598364 (1997-01-01), McCall et al.
patent: 6337778 (2002-01-01), Gagne
patent: 20040012874 (2004-01-01), Chainer et al.

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