Accumulator for non-return to zero (NRZ) linear feedback shift register (LFSR) in controller for disk drive
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United States of America Patent
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Jan 28, 2014
Grant Date -
N/A
app pub date -
Sep 14, 2012
filing date -
Feb 14, 2007
priority date (Note) -
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Abstract
A disk controller for a hard disk drive includes a disk formatter interfaced via an NRZ bus to a read channel for the disk. The disk formatter includes an LFSR accumulator coupled to the NRZ bus, as well as an LSFR generator that generates synthetic test data for the disk formatter. Under control of a test flag which signifies a test mode, the LSFR generator generates synthetic test data, which is used by the disk formatter to drive the NRZ bus. The LSFR accumulator accumulates data on the NRZ bus, together with data on servo information and sector information. An interface is provided through which the accumulated information is provided to test equipment, for offline analysis of the accumulated information, so as to confirm proper operation of the disk subsystem and/or to detect failures therein.
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