Fujitsu MHW2120BS User Manual Page 67
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4.7 Servo Control
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 4.6 is the block diagram of the servo control circuit. The following
describes the functions of the blocks:
Head
Spindle
motor
CSR
VCM
Position Sense
VCM current
CSR: Current Sense Resister
VCM: Voice Coil Motor
(1)
MPU/HDC/RDC
(2)
Servo
burst
capture
(3)
DAC
(4)
SVC
Power
Amp
(5)
Spindle
motor
control
(6)
Driver
(7)
MPU
core
Figure 4.6 Block diagram of servo control circuit
C141-E249 4-13
- FOR SAFE OPERATION 2
- Revision History 3
- Preface 5
- Operating Environment 6
- Conventions 6
- Attention 7
- Liability Exception 7
- Important Alert Items 9
- Manual Organization 11
- Contents 13
- Illustrations 19
- CHAPTER 1 Device Overview 23
- 1.1 Features 24
- 1.1.3 Interface 25
- 1.2 Device Specifications 26
- • + 5 V ± 5 % 28
- 1.5 Acoustic Noise 32
- 1.6 Shock and Vibration 32
- 1.7 Reliability 33
- 1.8 Error Rate 34
- 1.9 Media Defects 34
- 1.10 Load/Unload Function 34
- 2.1 Device Configuration 40
- 2.2 System Configuration 41
- 3.1 Dimensions 44
- •m (5kgf•cm) 45
- Mounting screw hole 49
- Cable connection 49
- 3.3.1 Device connector 51
- 4.1 Outline 56
- 4.2 Subassemblies 56
- 4.3 Circuit Configuration 57
- C141-E249 4-5 59
- 4.4 Power-on Sequence 60
- Power-on 61
- 4.5 Self-calibration 62
- 4.6 Read/write Circuit 64
- 4.6.3 Read circuit 65
- 4.6.4 Digital PLL circuit 66
- 4.7 Servo Control 67
- Diameter 70
- 4.7.3 Servo frame format 71
- Theory of Device Operation 72
- (2) Seek operation 72
- 4.7.5 Spindle motor control 73
- CHAPTER 5 Interface 75
- 5.1 Physical Interface 76
- COMRESET/COMINIT 78
- 106.7 ns 78
- 106.7 ns 106.7 ns 78
- 5.1.4 Connector pinouts 84
- 5.1.5 P11 function 85
- 5-12 C141-E249 86
- 5.1.6 Hot Plug 87
- 5.2 Logical Interface 88
- 5.2.1 Communication layers 89
- 5.3 Host Commands 103
- Interface 104
- 5-30 C141-E249 104
- 5.3.2 Command descriptions 106
- Word Value Content 162
- 5-88 C141-E249 162
- C141-E249 5-89 163
- 5.3 Host Commands 163
- C141-E249 5-91 165
- (23) READ BUFFER (X’E4’) 175
- (24) FLUSH CACHE (X’E7’) 176
- (25) WRITE BUFFER (X’E8’) 177
- Bit 0: Reserved 186
- Setup FIS 186
- × 2 minutes 190
- (28) SET FEATURES (X’EF’) 193
- → Low Power Idle 197
- 01h (*1) 198
- (36) SET MAX (X’F9’) 211
- • SET MAX ADDRESS 211
- • Description 217
- (38) READ DMA EXT (X’25’) 218
- Sector offset (7-0) 222
- (43) WRITE DMA EXT (X’35’) 228
- 5.3.3 Error posting 242
- 5.4 Command Protocol 245
- C141-E249 5-173 247
- • WRITE DMA (EXT) (FUA EXT) 250
- C141-E249 5-179 253
- 5-180 C141-E249 254
- C141-E249 5-181 255
- This page is intentionally 256
- blank 256
- CHAPTER 6 Operations 257
- 6.1 Reset and Diagnosis 258
- 6.1 Reset and Diagnosis 259
- earlier than the host) 259
- C141-E249 6-3 259
- 6.1.2 Response to COMRESET 260
- 6.2 Power Save 264
- 6.2.2 Power commands 266
- • READ SECTOR (s) (EXT) 269
- • READ MULTIPLE (EXT) 269
- • READ DMA (EXT) 269
- • READ FP DMA QUEUED 269
- 6.4.2 Caching operation 270
- 273
- Cache valid data 275
- START LBA 275
- LAST LBA 275
- 6.5 Write Cache 276
- IMPORTANT 277
- Glossary 279
- Acronyms and Abbreviations 283
- Comment Form 291
- DISK DRIVES PRODUCT MANUAL 293
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