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6.1 Reset and Diagnosis
C141-E239 6-5
6.1.2.1 Software settings preservation
When a device is enumerated, software will configure the device using SET
FEATURES and other commands. These software settings are often preserved
across software reset but not necessarily across hardware reset. In Parallel ATA,
only commanded hardware resets can occur, thus legacy software only
reprograms settings that are cleared for the particular type of reset it has issued. In
Serial ATA, COMRESET is equivalent to hard reset and a non-commanded
COMRESET may occur if there is an asynchronous loss of signal. Since
COMRESET is equivalent to hardware reset, in the case of an asynchronous loss
of signal some software settings may be lost without legacy software knowledge.
In order to avoid losing important software settings without legacy driver
knowledge, the software settings reservation ensures that the value of important
software settings is maintained across a COMRESET. Software settings
preservation may be enabled or disabled using SET FEATURES with a
subcommand code of 06h (refer to Section 5.3.2 (28)). If a device supports
software settings preservation, the feature shall be enabled by default.
6.1.2.2 COMRESET preservation requirements
The software settings that shall be preserved across COMRESET are listed below.
The device is only required to preserve the indicated software setting if it supports
the particular feature/command the setting is associated with.
• INITIALIZE DEVICE PARAMETERS
Device settings established with the INITIALIZE DEVICE PARAMETERS
command.
• Power Management Feature Set Standby Timer
The Standby timer used in the Power Management feature set.
• Security mode state
The security mode state established by Security Mode feature set commands
(refer to Section 6.13 of the ATA/6 specification). The device shall not
transition to a different security mode state based on a COMRESET. For
example, the device shall not transition from the SEC5: Unlocked / not
Frozen state to state SEC4: Security enabled /Locked when a COMRESET
occurs, instead the device shall remain in the SEC5: Unlocked /not Frozen
state.
• SECURITY FREEZE LOCK
The Frozen mode setting established by the SECURITY FREEZE LOCK
command.
• SECURITY UNLOCK
The unlock counter that is decremented as part of a failed SECURITY
UNLOCK command attempt.
- MHV2160BT 1
- DISK DRIVE 1
- PRODUCT MANUAL 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
- Contents 19
- C141-E239 xv 19
- 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 34
- 1.6 Shock and Vibration 34
- 1.7 Reliability 35
- 1.8 Error Rate 36
- 1.9 Media Defects 36
- 1.10 Load/Unload Function 36
- 2.1 Device Configuration 42
- 2.2 System Configuration 43
- This page is intentionally 44
- blank 44
- 3.1 Dimensions 46
- 3.2 Mounting 47
- 3.2 Mounting 49
- Installation Conditions 50
- (4) Ambient temperature 50
- General notes 52
- Installation 52
- Recommended equipments 52
- 4.1 Outline 58
- 4.2 Subassemblies 58
- 4.3 Circuit Configuration 59
- C141-E239 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
- COMRESET/COMINIT 80
- 106.7 ns 80
- 106.7 ns 106.7 ns 80
- 20-80TX 84
- 5.1.4 Connector pinouts 86
- 5.1.5 P11 function 87
- 5-12 C141-E239 88
- 5.1.6 Hot Plug 89
- Host located layers 90
- Device located layers 90
- 5.2.1 Communication layers 91
- 5.3 Host Commands 105
- Interface 106
- 5-30 C141-E239 106
- 5.3.2 Command descriptions 108
- 5-88 C141-E239 164
- Word Value Content 164
- 5.3 Host Commands 165
- C141-E239 5-89 165
- Bit 0: Reserved 187
- Setup FIS 188
- 01h (*1) 198
- • WRITE MULTIPLE FUA EXT 207
- • WRITE DMA FUA EXT 207
- • READ FP DMA QUEUED 207
- • WRITE FP DMA QUEUED 207
- Status information 212
- Password information 213
- Sector offset (7-0) 222
- 5.3.3 Error posting 242
- 5.4 Command Protocol 244
- • READ DMA (EXT) 249
- • IDENTFY DEVICE 249
- • IDENTFY DEVICE DMA 249
- DMA Active 250
- 5.4 Command Protocol 253
- C141-E239 5-177 253
- 5.5 Power-on and COMRESET 254
- C141-E239 5-179 255
- CHAPTER 6 Operations 257
- 6.1 Reset and Diagnosis 258
- 6.1 Reset and Diagnosis 259
- C141-E239 6-3 259
- earlier than the host) 259
- 6.1.2 Response to COMRESET 260
- • Security mode state 261
- • SECURITY FREEZE LOCK 261
- • SECURITY UNLOCK 261
- 6.2 Power Save 264
- 6.2.2 Power commands 266
- 6.4 Read-ahead Cache 269
- 6.4.2 Caching operation 270
- 273
- 6.5 Write Cache 276
- IMPORTANT 277
- Glossary 279
- Acronyms and Abbreviations 283
- Comment Form 291
- C141-E239-01EN 293
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