HK95692A - Disk drive controller - Google Patents

Disk drive controller

Info

Publication number
HK95692A
HK95692A HK956/92A HK95692A HK95692A HK 95692 A HK95692 A HK 95692A HK 956/92 A HK956/92 A HK 956/92A HK 95692 A HK95692 A HK 95692A HK 95692 A HK95692 A HK 95692A
Authority
HK
Hong Kong
Prior art keywords
read
cell
pulses
inch
parameters representing
Prior art date
Application number
HK956/92A
Inventor
Wendell Sander
Brian Sander
Original Assignee
Apple Computer
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Apple Computer filed Critical Apple Computer
Publication of HK95692A publication Critical patent/HK95692A/en

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/10009—Improvement or modification of read or write signals
    • G11B20/10046—Improvement or modification of read or write signals filtering or equalising, e.g. setting the tap weights of an FIR filter
    • G11B20/10212—Improvement or modification of read or write signals filtering or equalising, e.g. setting the tap weights of an FIR filter compensation for data shift, e.g. pulse-crowding effects
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
    • G06F3/0601—Interfaces specially adapted for storage systems
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
    • G11B20/1217—Formatting, e.g. arrangement of data block or words on the record carriers on discs
    • G11B20/1252—Formatting, e.g. arrangement of data block or words on the record carriers on discs for discontinuous data, e.g. digital information signals, computer programme data
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/14—Digital recording or reproducing using self-clocking codes
    • G11B20/1403—Digital recording or reproducing using self-clocking codes characterised by the use of two levels
    • G11B20/1407—Digital recording or reproducing using self-clocking codes characterised by the use of two levels code representation depending on a single bit, i.e. where a one is always represented by a first code symbol while a zero is always represented by a second code symbol
    • G11B20/1419—Digital recording or reproducing using self-clocking codes characterised by the use of two levels code representation depending on a single bit, i.e. where a one is always represented by a first code symbol while a zero is always represented by a second code symbol to or from biphase level coding, i.e. to or from codes where a one is coded as a transition from a high to a low level during the middle of a bit cell and a zero is encoded as a transition from a low to a high level during the middle of a bit cell or vice versa, e.g. split phase code, Manchester code conversion to or from biphase space or mark coding, i.e. to or from codes where there is a transition at the beginning of every bit cell and a one has no second transition and a zero has a second transition one half of a bit period later or vice versa, e.g. double frequency code, FM code
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
    • G06F3/0601—Interfaces specially adapted for storage systems
    • G06F3/0668—Interfaces specially adapted for storage systems adopting a particular infrastructure
    • G06F3/0671—In-line storage system
    • G06F3/0673—Single storage device
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B2020/1087—Digital recording or reproducing wherein a selection is made among at least two alternative ways of processing
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B2020/1087—Digital recording or reproducing wherein a selection is made among at least two alternative ways of processing
    • G11B2020/10879—Digital recording or reproducing wherein a selection is made among at least two alternative ways of processing the kind of record carrier being the selection criterion
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)

Abstract

A disc drive controller has read post compensation which corrects for peak shift effects on discs with insufficient precompensation. The data is recorded in Manchester (MFM) format and read into circuitry including SCT counter (451) which loads parameters representing a cell with a short-cell (2 unit) following it and LCT counter (453) which loads parameters representing a cell with a long cell (3 or 4 unit) following it. Bound detector 455 counts the number of pulses between transitions and shift registers (457, 459) store the number of pulses generated by the respective counters to enable the bound detector to generate peak shift compensated pulses. The controller has a programmable parameter scheme which makes it possible to read and write 3 1/2 inch variable and fixed speed drives, as well as standard 5 1/4 inch drives. Additionally, there is a plus/minus rate multiplier to correct for symmetry and frequency errors. The use of half clock circuits to provide half clock resolution in the signal being written to and read from the disk is provided with the capability of operating at continuously variable clock speeds and data rates dynamically programmable by the computer. <IMAGE>
HK956/92A 1987-05-28 1992-12-03 Disk drive controller HK95692A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US5544387A 1987-05-28 1987-05-28

Publications (1)

Publication Number Publication Date
HK95692A true HK95692A (en) 1992-12-11

Family

ID=21997833

Family Applications (3)

Application Number Title Priority Date Filing Date
HK728/92A HK72892A (en) 1987-05-28 1992-09-24 Disk drive controller
HK727/92A HK72792A (en) 1987-05-28 1992-09-24 Disk drive controller
HK956/92A HK95692A (en) 1987-05-28 1992-12-03 Disk drive controller

Family Applications Before (2)

Application Number Title Priority Date Filing Date
HK728/92A HK72892A (en) 1987-05-28 1992-09-24 Disk drive controller
HK727/92A HK72792A (en) 1987-05-28 1992-09-24 Disk drive controller

Country Status (5)

Country Link
AU (1) AU606409B2 (en)
CA (1) CA1309189C (en)
GB (3) GB2205467B (en)
HK (3) HK72892A (en)
SG (1) SG63592G (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5543975A (en) * 1993-11-12 1996-08-06 Hewlett-Packard Company Removal of precompensation in a write data signal from a flexible disk controller
JP3345515B2 (en) * 1994-08-31 2002-11-18 アイワ株式会社 Peak shift correction circuit and magnetic recording medium reproducing apparatus using the same
GB2355097B (en) * 1996-08-13 2001-05-23 Fujitsu Ltd Semiconductor device
TW340262B (en) 1996-08-13 1998-09-11 Fujitsu Ltd Semiconductor device, system consisting of semiconductor devices and digital delay circuit

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3510786A (en) * 1967-07-17 1970-05-05 Ibm Synchronizing circuit compensating for data bit shift
US3537084A (en) * 1967-08-14 1970-10-27 Burroughs Corp Data storage timing system with means to compensate for data shift
US3622894A (en) * 1970-12-07 1971-11-23 Ibm Predetection signal compensation
BE788030A (en) * 1971-08-27 1973-02-26 Siemens Ag DIGITAL CORRECTION CIRCUIT FOR CORRECTING READING PULSE TRAINS PROVIDED BY MAGNETIC FILM MEMORIES
US3827078A (en) * 1972-11-01 1974-07-30 Burroughs Corp Digital data retrieval system with dynamic window skew
US3794987A (en) * 1972-11-01 1974-02-26 Burroughs Corp Mfm readout with assymetrical data window
US3831194A (en) * 1973-07-19 1974-08-20 Honeywell Inf Systems Digital data recovery system with circuitry which corrects for peak shifting
US4281356A (en) * 1979-11-28 1981-07-28 R. C. Sanders Technology Systems, Inc. Magnetic disk memory
JPS6063704A (en) * 1983-09-19 1985-04-12 Hitachi Ltd Magnetic recorder
US4566044A (en) * 1984-10-29 1986-01-21 International Business Machines Corporation Direction-constrained ternary codes using peak and polarity detection
IT1200426B (en) * 1985-03-21 1989-01-18 Honeywell Inf Systems DIGITAL APPARATUS FOR RECOVERY SYSTEM OF BINARY INFORMATION RECORDED ON MAGNETIC MEDIA

Also Published As

Publication number Publication date
GB2205467A (en) 1988-12-07
HK72892A (en) 1992-10-02
GB2243059A (en) 1991-10-16
AU1475588A (en) 1988-12-01
CA1309189C (en) 1992-10-20
HK72792A (en) 1992-10-02
GB9110826D0 (en) 1991-07-10
GB2243060B (en) 1992-02-05
GB9110827D0 (en) 1991-07-10
AU606409B2 (en) 1991-02-07
GB2243059B (en) 1992-02-05
GB8720026D0 (en) 1987-09-30
SG63592G (en) 1992-09-04
GB2243060A (en) 1991-10-16
GB2205467B (en) 1992-02-12

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