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Operations
6-12 C141-E218
6.4 Read-ahead Cache
Read-ahead Cache is the function for automatically reading data blocks upon
completion of the read command in order to read data from disk media and save
data block on a data buffer.
If a subsequent command requests reading of the read-ahead data, data on the data
buffer can be transferred without accessing the disk media. As the result, faster
data access becomes possible for the host.
6.4.1 DATA buffer structure
This device contains a data buffer. This buffer is divided into two areas: one area
is used for MPU work, and the other is used as a read cache for another command.
(See Figure 6.7)
a) 8MB buffer (8,388,608 bytes)
For MPU work
F
or R/W command
8,388,608 bytes
557,056
bytes
7
,831,552
bytes
Figure 6.7 Data buffer structure
The read-ahead operation is done by the following commands.
• READ SECTOR(S) (EXT)
• READ MULTIPLE (EXT)
• READ DMA (EXT)
• READ SECTOR(S) EXT
• READ DMA EXT
• READ MULTIPLE EXT
- C141-E218-01EN 1
- 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 20
- CHAPTER 1 Device Overview 25
- 1.1 Features 26
- 1.1.3 Interface 27
- 1.2 Device Specifications 28
- 1.3 Power Requirements 30
- 1.5 Acoustic Noise 33
- 1.6 Shock and Vibration 33
- 1.7 Reliability 34
- 1.8 Error Rate 35
- 1.9 Media Defects 35
- 1.10 Load/Unload Function 35
- 2.1 Device Configuration 40
- 2.2 System Configuration 41
- 2.2.3 2 drives connection 42
- 3.1 Dimensions 44
- 3.2 Mounting 45
- 3.3 Cable Connections 51
- 3.3.3 Device connection 52
- 3.4 Jumper Settings 53
- 3.4.4 CSEL setting 55
- 4.1 Outline 58
- 4.2 Subassemblies 58
- 4.3 Circuit Configuration 59
- MCU & HDC & RDC 60
- 3.3V 1.2V 60
- C141-E218 4-5 61
- 4.4 Power-on Sequence 62
- 4.5 Self-calibration 63
- 4.6 Read/write Circuit 65
- 4.6.3 Read circuit 66
- 4.6.4 Digital PLL circuit 67
- 4.7 Servo Control 68
- 4.7.3 Servo frame format 73
- 4.7.5 Spindle motor control 75
- CHAPTER 5 Interface 77
- 5.1 Physical Interface 78
- 5.2 Logical Interface 82
- 5.2.1 I/O registers 83
- 5.3 Host Commands 90
- 5.3.2 Command descriptions 94
- • Default function 110
- • Attribute ID 123
- • Status Flag 124
- • Current attribute value 124
- • Raw attribute value 124
- • Error logging capability 127
- • Check sum 127
- • SMART error logging 128
- • Command data structure 130
- • Error data structure 130
- • Status 130
- • SMART self-test 131
- • Self-test number 131
- • Self-test index 131
- Initial 132
- • Feature flags 133
- (CM) 1 1 1 0 0 1 0 0 149
- • SET MAX ADDRESS 180
- Password information 182
- • SET MAX SET PASSWORD 184
- • SET MAX LOCK 184
- • SET MAX UNLOCK 184
- • Description 186
- Sector offset (7-0) 190
- 5.3.3 Error posting 203
- Interface 204
- 5-128 C141-E218 204
- 5.4 Command Protocol 205
- 5.4.4 Other commands 211
- 5.5 Ultra DMA Feature Set 213
- 5.5.2 Phases of operation 214
- 5.5.5 Ultra DMA CRC rules 223
- 5.6 Timing 225
- DIOR-/DIOW 226
- HSTROBE 239
- (host) 239
- DA0, DA1, DA2 239
- CS0-, CS1 239
- 5.6.4 Power-on and reset 240
- CHAPTER 6 Operations 241
- 6.1.1 Response to power-on 242
- 6.2 Power Save 247
- 6.3 Defect Processing 249
- Sector (physical) 250
- Cylinder 0 250
- (Not used) 250
- 6.4 Read-ahead Cache 252
- 6.4.2 Caching operation 253
- 256
- 6.5 Write Cache 259
- Glossary 263
- Acronyms and Abbreviations 267
- Comment Form 275
- C141-E218-01EN 277
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