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

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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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
HITACHI GLOBAL STORAGE TECHNOLOGIES NETHERLANDS B.V.AMSTERDAM1325
INTERNATIONAL BUSINESS INTERNATIONAL CORPORATIONARMONK, NY1

International Classification(s)

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  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hong, Ju-Hi J San Jose, CA 3 47
Wood, Roger W Gilroy, CA 11 184

Cited Art

Patent Info (Count) # Cites Year
 
INTERNATIONAL BUSINESS MACHINES CORPORATION (2)
4,320,517 Method and device for effecting the initial adjustment of the clock in a synchronous data receiver 43 1980
4,847,877 Method and apparatus for detecting a predetermined bit pattern within a serial bit stream 74 1986
 
SGS-THOMSON MICROELECTRONICS, INC. (2)
5,005,191 System for synchronizing data frame groups in a serial bit stream 17 1989
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ADVANCED MICRO DEVICES, INC. (1)
4,787,095 Preamble search and synchronizer circuit 11 1987
 
AT&T INFORMATION SYSTEMS INC. (1)
4,815,103 Equalizer-based timing recovery 54 1987
 
FUJITSU LIMITED (1)
4,748,623 Frame synchronizing circuit 56 1987
 
HITACHI, LTD. (1)
5,267,267 Timing extraction method and communication system 13 1992
 
LIGNES TELEGRAPHIQUES ET TELEPHONIQUES L.T.T. (1)
4,594,728 Synchronization device for digital frame transmission 9 1984
 
NEC CORPORATION (1)
5,073,906 Synchronization word detection apparatus 3 1990
 
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 Cites

Patent Info (Count) # Cites Year
 
LSI LOGIC CORPORATION (6)
5,956,370 Wrap-back test system and method 42 1996
5,787,114 Loop-back test system and method 64 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
5,790,563 Self test of core with unpredictable latency 21 1997
 
CIRRUS LOGIC, INC. (5)
5,796,535 Sampled amplitude read channel employing a user data frequency synthesizer and a servo data frequency synthesizer 64 1995
5,729,396 Fault tolerant sync mark detector enabled relative to a frequency of an acquisition preamble for sampled amplitude recording 23 1995
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 21 1995
5,844,920 Thermal asperity compensation using multiple sync marks for retroactive and split segment data synchronization in a magnetic disk storage system 111 1996
6,023,386 Fault tolerant sync mark detector for synchronizing a time varying sequence detector in a sampled amplitude read channel 46 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 20 1995
6,816,934 Computer system with registered peripheral component interconnect device for processing extended commands and attributes according to a registered peripheral component interconnect protocol 7 2003
7,099,986 High speed peripheral interconnect apparatus, method and system 7 2004
7,587,542 Device adapted to send information in accordance with a communication protocol 6 2005
7,464,207 Device operating according to a communication protocol 9 2005
 
INTERNATIONAL BUSINESS MACHINES CORPORATION (2)
5,715,176 Method and system for locating a frame position in an MPEG data stream 34 1996
6,089,749 Byte synchronization system and method using an error correcting code 9 1997
 
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 41 1997
 
ELA MEDICAL S.A. (1)
5,899,931 Synchronous telemetry transmission between a programmer and an autonomous device 83 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 37 1997
 
LAKE CHEROKEE HARD DRIVE TECHNOLOGIES, LLC (1)
5,966,258 Asynchronous/synchronous digital gain control loop in a sampled amplitude read channel 29 1997
 
MARVELL INTERNATIONAL LTD. (1)
7,054,398 Method for selecting sync marks and sync mark detectors 14 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 19 1997
 
QUALCOMM INCORPORATED (1)
6,870,858 Training sequence based signalling for enhanced general packet radio service (EGPRS) 10 2000
 
STMICROELECTRONICS, INC. (1)
7,136,440 Timing recovery for data sampling of a detector 3 2001
 
SWAYZE, W. DANIEL, JR. (1)
5,856,986 Synchronization field pattern selection 30 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
 
OTHER [CHECK PATENT PROFILE FOR ASSIGNMENT INFORMATION] (1)
8,442,100 Transmission and reception apparatus for digital signals 0 2010