IBM DTTA-351010 Hard Drive Specifications - Page 86

Power Mode, Power Management Commands, Standby timer, Interface Capability for Power Modes

Get IBM DTTA-351010 - Deskstar 10.1 GB Hard Drive PDF manuals and user guides View all IBM DTTA-351010 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 86 highlights

2. Idle command 3. Idle Immediate command 4. Sleep command 5. Standby command 6. Standby Immediate command 10.5.1 Power Mode The lowest power consumption when the device is powered on occurs in Sleep Mode. When in sleep mode, the device requires a reset to be activated. In Standby Mode the device interface is capable of accepting commands, but as the media may not immediately accessible, there is a delay while waiting for the spindle to reach operating speed. In Idle Mode the device is capable of responding immediately to media access requests. In Active Mode the device is under executing a command or accessing the disk media with read look-ahead function or write cache function. 10.5.2 Power Management Commands The Check Power Mode command allows a host to determine if a device is currently in, going to or leaving standby mode. The Idle and Idle Immediate commands move a device to idle mode immediately from the active or standby modes. The idle command also sets the standby timer count and starts the standby timer. The Standby and Standby Immediate commands move a device to standby mode immediately from the active or idle modes. The standby command also sets the standby timer count. The Sleep command moves a device to sleep mode. The device's interface becomes inactive at the completion of the sleep command. A reset is required to move a device out of sleep mode. When a device exits sleep mode it will enter Standby mode. 10.5.3 Standby timer The standby timer provides a method for the device to automatically enter standby mode from either active or idle mode following a host programmed period of inactivity. If the device is in the active or idle mode, the device waits for the specified time period and if no command is received, the device automatically enters the standby mode. If the value of SECTOR C O U N T register on Idle command or Standby command is set to 00h, the standby timer is disabled. 10.5.4 Interface Capability for Power Modes The each power mode affects the physical interface as defined in the following table: 78 OEM Specifications for DTTA-3xxxxx

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
  • 93
  • 94
  • 95
  • 96
  • 97
  • 98
  • 99
  • 100
  • 101
  • 102
  • 103
  • 104
  • 105
  • 106
  • 107
  • 108
  • 109
  • 110
  • 111
  • 112
  • 113
  • 114
  • 115
  • 116
  • 117
  • 118
  • 119
  • 120
  • 121
  • 122
  • 123
  • 124
  • 125
  • 126
  • 127
  • 128
  • 129
  • 130
  • 131
  • 132
  • 133
  • 134
  • 135
  • 136
  • 137
  • 138
  • 139
  • 140
  • 141
  • 142
  • 143
  • 144
  • 145
  • 146
  • 147
  • 148
  • 149
  • 150
  • 151
  • 152
  • 153
  • 154
  • 155
  • 156
  • 157
  • 158
  • 159
  • 160
  • 161
  • 162
  • 163
  • 164
  • 165
  • 166
  • 167
  • 168
  • 169
  • 170
  • 171
  • 172
  • 173
  • 174
  • 175
  • 176
  • 177
  • 178
  • 179
  • 180
  • 181
  • 182
  • 183
  • 184
  • 185
  • 186
  • 187
  • 188
2.
Idle command
3.
Idle Immediate command
4.
Sleep command
5.
Standby command
6.
Standby Immediate command
10.5.1
Power Mode
The lowest power consumption when the device is powered on occurs in Sleep Mode. When in sleep mode,
the device requires a reset to be activated.
In Standby Mode the device interface is capable of accepting commands, but as the media may not imme-
diately accessible, there is a delay while waiting for the spindle to reach operating speed.
In Idle Mode the device is capable of responding immediately to media access requests.
In Active Mode the device is under executing a command or accessing the disk media with read look-ahead
function or write cache function.
10.5.2
Power Management Commands
The Check Power Mode command allows a host to determine if a device is currently in, going to or leaving
standby mode.
The Idle and Idle Immediate commands move a device to idle mode immediately from the active or standby
modes. The idle command also sets the standby timer count and starts the standby timer.
The Standby and Standby Immediate commands move a device to standby mode immediately from the
active or idle modes. The standby command also sets the standby timer count.
The Sleep command moves a device to sleep mode. The device's interface becomes inactive at the com-
pletion of the sleep command. A reset is required to move a device out of sleep mode. When a device exits
sleep mode it will enter Standby mode.
10.5.3
Standby timer
The standby timer provides a method for the device to automatically enter standby mode from either active
or idle mode following a host programmed period of inactivity.
If the device is in the active or idle mode,
the device waits for the specified time period and if no command is received, the device automatically enters
the standby mode.
If the value of SECTOR COUNT register on Idle command or Standby command is set to 00h, the standby
timer is disabled.
10.5.4
Interface Capability for Power Modes
The each power mode affects the physical interface as defined in the following table:
78
OEM Specifications for DTTA-3xxxxx