Fujitsu MPB3052AT User Manual download pdf (Page 9)

C141-E045-02ENviii

3.4.1 Location of setting jumpers............................................................................................ 3 - 9

3.4.2 Factory default setting .................................................................................................... 3 - 10

3.4.3 Jumper configuration...................................................................................................... 3 - 10

CHAPTER 4 THEORY OF DEVICE OPERATION......................................................... 4 - 1

4.1 Outline............................................................................................................................ 4 - 1

4.2 Subassemblies ................................................................................................................ 4 - 1

4.2.1 Disk ................................................................................................................................ 4 - 1

4.2.2 Head ............................................................................................................................... 4 - 2

4.2.3 Spindle............................................................................................................................ 4 - 3

4.2.4 Actuator.......................................................................................................................... 4 - 3

4.2.5 Air filter.......................................................................................................................... 4 - 3

4.3 Circuit Configuration...................................................................................................... 4 - 4

4.4 Power-on Sequence ........................................................................................................ 4 - 6

4.5 Self-calibration ............................................................................................................... 4 - 8

4.5.1 Self-calibration contents................................................................................................. 4 - 8

4.5.2 Execution timing of self-calibration ............................................................................... 4 - 9

4.5.3 Command processing during self-calibration................................................................. 4 - 9

4.6 Read/write Circuit........................................................................................................... 4 - 10

4.6.1 Read/write preamplifier (PreAMP)................................................................................. 4 - 10

4.6.2 Write circuit.................................................................................................................... 4 - 10

4.6.3 Read circuit..................................................................................................................... 4 - 12

4.6.4 Time base generator circuit............................................................................................. 4 - 14

4.7 Servo Control ................................................................................................................. 4 - 15

4.7.1 Servo control circuit ....................................................................................................... 4 - 16

4.7.2 Data-surface servo format............................................................................................... 4 - 19

4.7.3 Servo frame format......................................................................................................... 4 - 19

4.7.4 Actuator motor control ................................................................................................... 4 - 20

4.7.5 Spindle motor control..................................................................................................... 4 - 21

CHAPTER 5 INTERFACE................................................................................................... 5 - 1

5.1 Physical Interface ........................................................................................................... 5 - 2

5.1.1 Interface signals.............................................................................................................. 5 - 2

5.1.2 Signal assignment on the connector ............................................................................... 5 - 3

5.2 Logical Interface............................................................................................................. 5 - 6

5.2.1 I/O registers .................................................................................................................... 5 - 6

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Fujitsu MPB3052AT User Manual Page 9