JPS55117775A - Magnetic head positioning control circuit of magnetic disk unit - Google Patents

Magnetic head positioning control circuit of magnetic disk unit

Info

Publication number
JPS55117775A
JPS55117775A JP2137579A JP2137579A JPS55117775A JP S55117775 A JPS55117775 A JP S55117775A JP 2137579 A JP2137579 A JP 2137579A JP 2137579 A JP2137579 A JP 2137579A JP S55117775 A JPS55117775 A JP S55117775A
Authority
JP
Japan
Prior art keywords
pulse
cylinder
counter
value
subtraction
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
JP2137579A
Other languages
Japanese (ja)
Inventor
Takayuki Mukuda
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co Ltd
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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP2137579A priority Critical patent/JPS55117775A/en
Publication of JPS55117775A publication Critical patent/JPS55117775A/en
Pending legal-status Critical Current

Links

Landscapes

  • Moving Of Head For Track Selection And Changing (AREA)
  • Control Of Position Or Direction (AREA)

Abstract

PURPOSE: To realize versatility and high integration while simplifying a maintenance diagnosis, by freely modifying a reference speed profile by storing the value of a constant-speed area and that of a function-speed area in subtraction counters respectively.
CONSTITUTION: Function speed value Y is stored in subtraction counter 12 via bus 1 by tag 2, and cylinder-number X in a constant-speed area in subtraction counter 11 via bus 1 by tag 3, so that a signal corresponding to value Y will appear at output 5 of function generator 13. Once driver circuit 15 receives seek start signal 8 in this state, positioning mechanism 17 starts moving so as to obtain pulse 7 every time a magnetic head passed through a cylinder and when counter 11 is subtracted by pulse 7 down to zero, borrow signal 6 is outputted corresponding to pulse 7. After mechanism 17 passes through cylinder as many as number X, pulse 7 puts counter 12 in subtraction operation and when its count value is zero, reference speed signal 5 shows zero, so that the head will stop at an aimed cylinder position.
COPYRIGHT: (C)1980,JPO&Japio
JP2137579A 1979-02-27 1979-02-27 Magnetic head positioning control circuit of magnetic disk unit Pending JPS55117775A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2137579A JPS55117775A (en) 1979-02-27 1979-02-27 Magnetic head positioning control circuit of magnetic disk unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2137579A JPS55117775A (en) 1979-02-27 1979-02-27 Magnetic head positioning control circuit of magnetic disk unit

Publications (1)

Publication Number Publication Date
JPS55117775A true JPS55117775A (en) 1980-09-10

Family

ID=12053340

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2137579A Pending JPS55117775A (en) 1979-02-27 1979-02-27 Magnetic head positioning control circuit of magnetic disk unit

Country Status (1)

Country Link
JP (1) JPS55117775A (en)

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