Fujitsu MHR2030AT User Manual Page 66
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Theory of Device Operation
4-14 C141-E145-02EN
4.7 Servo Control
The actuator motor and the spindle motor are submitted to servo control. The
actuator motor is controlled for moving and positioning the head to the track
containing the desired data. To turn the disk at a constant velocity, the actuator
motor is controlled according to the servo data that is written on the data side
beforehand.
4.7.1 Servo control circuit
Figure 4.7 is the block diagram of the servo control circuit. The following
describes the functions of the blocks:
Figure 4.7 Block diagram of servo control circuit
(1) Microprocessor unit (MPU)
The MPU uses DSP and executes startup of the spindle motor, movement to the
reference cylinder, seek to the specified cylinder, and calibration operations.
Main internal operation of the MPU are shown below.
Head
Spindle
motor
CSR
VCM
Position Sense
VCM current
CSR: Current Sense Resister
VCM: Voice Coil Motor
(1)
MPU
(2)
Servo
burst
capture
(3)
DAC
(4)
SVC
Power
Amp
(5)
Spindle
motor
control
(6)
Driver
(7)
MPU
core
- MHR2040AT, MHR2030AT 1
- MHR2020AT, MHR2010AT 1
- DISK DRIVES 1
- PRODUCT MANUAL 1
- FOR SAFE OPERATION 2
- Revision History 3
- Overview of Manual 5
- Operating Environment 6
- Conventions 6
- Attention 7
- Liability Exception 7
- Important Alert Items 9
- Manual Organization 11
- Contents 13
- Illustrations 18
- CHAPTER 1 Device Overview 21
- 1.1 Features 22
- 1.1.3 Interface 23
- 1.2 Device Specifications 24
- 1.3 Power Requirements 25
- 1.5 Acoustic Noise 28
- 1.6 Shock and Vibration 28
- 1.7 Reliability 29
- 1.8 Error Rate 30
- 1.9 Media Defects 30
- 1.10Load/Unload Function 30
- C141-E145-02EN 2-1 33
- 2.1 Device Configuration 33
- 2.2 System Configuration 33
- 3.1 Dimensions 40
- 3.2 Mounting 41
- Installation Conditions 46
- 3-8 C141-E145-02EN 46
- Figure 3.7 Handling cautions 46
- 3.3 Cable Connections 47
- 3.3.3 Device connection 48
- 3.4 Jumper Settings 49
- 3.4.2 Factory default setting 50
- 3.4.4 CSEL setting 51
- 3-14 C141-E145-02EN 52
- 4.1 Outline 54
- 4.2 Subassemblies 54
- 4.2.3 Spindle 55
- 4.2.4 Actuator 55
- 4.2.5 Air filter 55
- 4.3 Circuit Configuration 56
- 4.3 Circuit Configuration 57
- C141-E145-02EN 4-5 57
- Theory of Device Operation 58
- 4-6 C141-E145-02EN 58
- 4.4 Power-on Sequence 59
- 4.5 Self-calibration 60
- 4.6 Read/write Circuit 62
- 4.6 Read/write Circuit 63
- C141-E145-02EN 4-11 63
- 4.6.3 Read circuit 64
- 4.6.4 Digital PLL circuit 65
- 4.7 Servo Control 66
- 4.7.3 Servo frame format 71
- 4.7.4 Actuator motor control 72
- 4.7.5 Spindle motor control 73
- CHAPTER 5 Interface 75
- 5.1 Physical Interface 76
- 5.2 Logical Interface 80
- 5.2.1 I/O registers 81
- 5.2.2 Command block registers 82
- 5.2.3 Control block registers 87
- 5.3 Host Commands 88
- 5.3.2 Command descriptions 92
- Password information 125
- (CM) 11110100 133
- 5.3.3 Error posting 178
- 5.3 Host Commands 179
- C141-E145-02EN 5-105 179
- 5.4 Command Protocol 180
- IMPORTANT 181
- 5.4.4 Other commands 186
- Interface 188
- 5-114 C141-E145-02EN 188
- 5.5 Ultra DMA Feature Set 189
- 5.5.2 Phases of operation 190
- 5.5.5 Ultra DMA CRC rules 199
- 5.6 Timing 201
- 5.6.2 Multiword data transfer 202
- 5.6.3 Ultra DMA data transfer 203
- (host) 215
- DA0, DA1, DA2 215
- CS0-, CS1 215
- 5.6.4 Power-on and reset 216
- CHAPTER 6 Operations 217
- 6.1.1 Response to power-on 218
- 6.2 Power Save 223
- 6.3 Defect Processing 225
- Sector (physical) 226
- Cylinder 0 226
- (Not used) 226
- 6.4 Read-ahead Cache 228
- 6.5 Write Cache 235
- Glossary 237
- Acronyms and Abbreviations 241
- Comment Form 245
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