发明名称 |
Method and apparatus for enhanced phase alignment for direct access storage device (DASD) |
摘要 |
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.
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申请公布号 |
US6839195(B2) |
申请公布日期 |
2005.01.04 |
申请号 |
US20020185550 |
申请日期 |
2002.06.27 |
申请人 |
HITACHI GLOBAL STORAGE TECHNOLOGIES NETHERLANDS, B.V. |
发明人 |
CHAINER TIMOTHY JOSEPH;COKER JONATHAN DARREL;FLYNN DAVID TIMOTHY;SCHULTZ MARK DELORMAN |
分类号 |
G11B5/09;G11B20/14;G11B27/10;G11B27/30;(IPC1-7):G11B5/09 |
主分类号 |
G11B5/09 |
代理机构 |
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主权项 |
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地址 |
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