US Patent No: 5,448,571

Number of patents in Portfolio can not be more than 2000

Method and apparatus for determining byte synchronization within a serial data receiver

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Abstract

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A synchronization pattern is provided within an incoming waveform which represents a serial data stream transmitted at a rate determined by a data clock. The synchronization pattern includes a periodic training portion and a sync word portion. The periodic training portion is periodic and has a preselected period. As the periodic training portion is received, a receiver clock phase-locks to the periodic training portion of the incoming waveform, and a sampling circuit periodically samples the incoming waveform relative to the phase and frequency of the receiver clock to produce sample words. Thereafter, a subset of the sample words are selected utilizing a selection pattern having a period equal to the period of the periodic training portion of the incoming waveform. Utilizing the selected subset of sample words, a sync indicator word is produced and compared to preselected criteria. Such a sync indicator word may be produced with reference to the sign of each sample word of the subset of sample words. Finally, in response to a correlation between the sync indicator word and the preselected criteria, byte synchronization between the incoming waveform and the data detector is indicated, wherein the byte synchronization independently from the output of a data detector.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
HITACHI GLOBAL STORAGE TECHNOLOGIES NETHERLANDS B.V.AMSTERDAM1333
INTERNATIONAL BUSINESS INTERNATIONAL CORPORATIONARMONK, NY1

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hong, Ju-Hi J San Jose, CA 3 47
Wood, Roger W Gilroy, CA 12 213

Cited Art Landscape

Patent Info (Count) # Cites Year
 
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SGS-THOMSON MICROELECTRONICS, INC. (2)
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AT&T Information Systems Inc. (1)
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FUJITSU LIMITED (1)
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NEC CORPORATION (1)
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RACAL-DATACOM, INC. (1)
4,807,230 Frame synchronization 16 1987
 
ROCKWELL INTERNATIONAL CORPORATION (1)
4,573,171 Sync detect circuit 8 1982
 
SIEMENS AKTIENGESELLSCHAFT (1)
4,213,011 Process for T.D.M. frame synchronization employing variable synchronizing words 11 1978

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
LSI LOGIC CORPORATION (6)
5,956,370 Wrap-back test system and method 48 1996
5,787,114 Loop-back test system and method 68 1996
5,781,544 Method for interleaving network traffic over serial lines 5 1996
5,896,426 Programmable synchronization character 0 1996
5,781,038 High speed phase locked loop test method and means 6 1996
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CIRRUS LOGIC, INC. (5)
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5,793,548 Fault tolerant sync mark detector for comparing a sign and magnitude of a detected sequence to a target sync mark in sampled amplitude magnetic recording 24 1995
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6,023,386 Fault tolerant sync mark detector for synchronizing a time varying sequence detector in a sampled amplitude read channel 50 1997
 
HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P. (5)
6,061,411 Method and apparatus for synchronizing a serial bus clock to a serial bus function clock 21 1995
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INTERNATIONAL BUSINESS MACHINES CORPORATION (2)
5,715,176 Method and system for locating a frame position in an MPEG data stream 34 1996
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AMOSMET INVESTMENTS LLC (1)
7,158,598 Method and device for identifying a data packet in a data stream 3 2001
 
BROADCOM CORPORATION (1)
6,646,822 Sampled amplitude read channel employing pipelined reads to reduce the gap between sectors 59 1997
 
FINISAR CORPORATION (1)
6,980,943 Flow for vector capture 5 2001
 
HGST NETHERLANDS B.V. (1)
5,903,410 Disk drive using multiple servo timing marks that form a code of unique interrelated bit patterns 38 1997
 
LAKE CHEROKEE HARD DRIVE TECHNOLOGIES, LLC (1)
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MARVELL INTERNATIONAL LTD. (1)
7,054,398 Method for selecting sync marks and sync mark detectors 18 2002
 
PARKER HANNIFIN CUSTOMER SUPPORT INC. (1)
6,108,151 Sampled amplitude read channel for reading user data and embedded servo data from a magnetic medium 20 1997
 
QUALCOMM INCORPORATED (1)
6,870,858 Training sequence based signalling for enhanced general packet radio service (EGPRS) 19 2000
 
SORIN CRM SAS (1)
5,899,931 Synchronous telemetry transmission between a programmer and an autonomous device 114 1997
 
STMICROELECTRONICS S.R.L. (1)
8,442,100 Transmission and reception apparatus for digital signals 0 2010
 
STMICROELECTRONICS, INC. (1)
7,136,440 Timing recovery for data sampling of a detector 4 2001
 
SWAYZE, W. DANIEL, JR. (1)
5,856,986 Synchronization field pattern selection 33 1996
 
TEKTRONIX, INC. (1)
6,847,349 Serial data cursor 4 2001
 
TEXAS INSTRUMENTS INCORPORATED (1)
6,999,534 Method for mitigating DC offset in a sign bit correlator 0 2002