Excavating
Patent
1993-12-16
1995-03-21
Canney, Vincent P.
Excavating
371 65, 371 671, G06F 1100
Patent
active
054003490
ABSTRACT:
An apparatus and method are disclosed for comparing disk data to a synchronization pattern. A preferred embodiment includes a plurality of exclusive NOR gates for exclusive NORing the disk data with the synchronization pattern to form an exclusive NOR output pattern. A left boundary stage locates a left boundary of an error burst in the exclusive NOR output pattern and generates a left boundary output pattern which indicates the position of the left boundary of the error burst. A multiplexer realigns the exclusive NOR output pattern by a number of bits equal to a maximum allowable error burst width to form a multiplexer output pattern. The exclusive NOR output pattern is realigned such that the least significant bits are shifted in a direction towards the most significant bits. A plurality of OR gates are used for ORing the left boundary output pattern with the multiplexer output pattern to form an OR gate output pattern, and an AND stage is used for ANDing together all of the bits of the OR gate output pattern.
REFERENCES:
patent: 4413251 (1983-11-01), Adler et al.
patent: 5051998 (1991-09-01), Murai et al.
patent: 5220568 (1993-06-01), Howe et al.
IBM Technical Disclosure Bulletin, "Fault-Tolerant Sync Byte For Run-Length-Limited Codes", vol. 29 No. 1, Jun. 1986, pp. 151-157.
Canney Vincent P.
National Semiconductor Corporation
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