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Fujitsu MJA2500BH Maintenance Manual - Page 267

Power Management Feature Set Standby Timer, 1.2.1 Software settings preservation

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6.1 Reset and Diagnosis 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. C141-E293 6-5

Section	Page
Front Cover	1
FOR SAFE OPERATION	2
Revision History	3
Preface	5
Important Alert Items	9
Manual Organization	11
Contents	13
Illustrations	19
Figures	19
Tables	21
CHAPTER 1 Device Overview	23
1.1 Features	24
1.1.1 Functions and performance	24
1.1.2 Adaptability	24
1.1.3 Interface	25
1.2 Device Specifications	27
1.2.1 Specifications summary	27
1.2.2 Model and product number	28
1.3 Power Requirements	29
1.4 Environmental Specifications	32
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
1.10.1 Recommended power-off sequence	36
1.11 Advanced Power Management (APM)	36
1.12 Interface Power Management (IPM)	38
1.12.1 Host-initiated interface power management (HIPM)	38
1.12.2 Device-initiated interface power management (DIPM)	38
CHAPTER 2 Device Configuration	41
2.1 Device Configuration	42
2.2 System Configuration	43
2.2.1 SATA interface	43
2.2.2 Drive connection	43
CHAPTER 3 Installation Conditions	45
3.1 Dimensions	46
3.2 Mounting	47
3.3 Connections with Host System	53
3.3.1 Device connector	53
3.3.2 Signal segment and power supply segment	54
3.3.3 Connector specifications for host system	54
3.3.4 SATA interface cable connection	55
3.3.5 Note about SATA interface cable connection	55
CHAPTER 4 Theory of Device Operation	57
4.1 Outline	58
4.2 Subassemblies	58
4.2.1 Disk	58
4.2.2 Spindle	58
4.2.3 Actuator	58
4.2.4 Air filter	59
4.3 Circuit Configuration	59
4.4 Power-on Sequence	62
4.5 Self-calibration	64
4.5.1 Self-calibration contents	64
4.5.2 Execution timing of self-calibration	65
4.5.3 Command processing during self-calibration	65
4.6 Read/write Circuit	66
4.6.1 Read/write preamplifier (PreAMP)	66
4.6.2 Write circuit	66
4.6.3 Read circuit	67
4.6.4 Digital PLL circuit	67
4.7 Servo Control	68
4.7.1 Servo control circuit	68
4.7.2 Data-surface servo format	70
4.7.3 Servo frame format	72
4.7.4 Actuator motor control	73
4.7.5 Spindle motor control	74
CHAPTER 5 Interface	75
5.1 Physical Interface	76
5.1.1 Interface signals	76
5.1.2 Signal interface regulation	78
5.1.3 Electrical specifications	80
5.1.4 Connector pinouts	81
5.1.5 P11 function	82
5.1.6 Hot Plug	84
5.2 Logical Interface	85
5.2.1 Communication layers	86
5.2.2 Outline of the Shadow Block Register	87
5.2.3 Outline of the frame information structure (FIS)	88
5.2.4 Shadow block registers	96
5.3 Host Commands	101
5.3.1 Command code and parameters	101
5.3.2 Command descriptions	104
5.3.3 Error posting	247
5.4 Command Protocol	249
5.4.1 Non-data command protocol	250
5.4.2 PIO data-in command protocol	252
5.4.3 PIO data-out command protocol	254
5.4.4 DMA data-in command protocol	256
5.4.5 DMA data-out command protocol	257
5.4.6 Native Command Queuing protocol	258
5.5 Power-on and COMRESET	261
CHAPTER 6 Operations	263
6.1 Reset and Diagnosis	264
6.1.1 Response to power-on	264
6.1.2 Response to COMRESET	266
6.1.3 Response to a software reset	269
6.2 Power Save	270
6.2.1 Power save mode	270
6.2.2 Power commands	272
6.3 Power Save Controlled by Interface Power Management (IPM)	273
6.3.1 Power save mode of the interface	273
6.4 Read-ahead Cache	275
6.4.1 Data buffer structure	275
6.4.2 Caching operation	276
6.4.3 Using the read segment buffer	278
6.5 Write Cache	282
6.5.1 Cache operation	282
CHAPTER 7 Maintenance and Diagnosis	285
7.1 Maintenance	286
7.1.1 Rules for maintenance	286
7.1.2 Maintenance requirements	287
7.1.3 Maintenance levels	289
7.1.4 Disk drive revision number	290
7.1.5 Tools and test equipment	292
7.1.6 Self-diagnostics	292
7.1.7 Test	292
7.2 Operation Confirmation	295
7.2.1 Operation test	295
7.2.2 Diagnostic test	295
7.3 Troubleshooting Procedure	296
7.3.1 Troubleshooting procedure	296
7.3.2 Troubleshooting disk drive replaced in field	296
7.3.3 Troubleshooting at factory	298
7.4 Disk Drive Removal Procedure	299
7.5 Spare Disk Drive	299
Glossary	301
Acronyms and Abbreviations	305
Index	307
Comment Form	315

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6.1

Reset and Diagnosis

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.

C141-E293

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