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5.3 Host Commands
C141-E262 5-49
(12) STANDBY (X '96' or X 'E2')
Upon receipt of this command, the device enters the standby mode. If the device
has already spun down, the spin-down sequence is not implemented.
If the Sector Count field has a value other than "0," the APS timer is set when the
command is received. When the device receives the command involving a seek
such as media access command, the device processes the command after
transition to Active mode. After that, the device enters the command waiting
state, and the timer starts to count down. If a command is not received within the
period specified as the APS timer value, the device automatically enters Standby
mode. If the Sector Count field value is "0" the APS timer is disabled when the
command is received.
Under the standby mode, the spindle motor is stopped. Thus, when the command
involving a seek such as READ SECTOR(s) command is received, the device
processes the command after driving the spindle motor.
• Error reporting conditions
(1) A SATA communication error occurred (ST = 51h, ER = 14h).
At command issuance (Shadow Block Registers setting contents)
CM X '96' or X 'E2'
DH x x x x xx
CH
CL
SN
SC
FR
xx
xx
xx
Period of timer
xx
At command completion (Shadow Block Registers contents to be read)
ST Status information
DH x x x x xx
CH
CL
SN
SC
ER
xx
xx
xx
xx
Error information