5.3 Host Commands
(13) IDLE (X’97’ or X’E3’)
Upon receipt of this command, the device enters the idle mode. The device report
the status even if the device has not fully entered the idle mode. If the spindle of
the device is already rotating, the spin-up sequence shall not be implemented.
By using this command, the APS (Automatic Power Standby) timer function is
enabled and the timer immediately starts the countdown. When the timer reaches
the specified value, the device enters standby mode. The APS timer is set to
prohibition if the Sector Count field's value was "0" when device has received this
command.
The period of timer count is set depending on the value of the Sector Count
register as shown below.
Sector Count field value Point of timer
0 [X’00’] Timeout disabled
1 to 240 [X’01’ to X’F0’]
(Value × 5) seconds
241 to 251 [X’F1’ to X’FB’]
((Value-240) × 30) min
252 [X’FC’] 21 minutes
253 [X’FD’] 8 hrs
254 to 255 [X’FE’ to X’FF’] 21 minutes 15 seconds
• Error reporting conditions
(1) A SATA communication error occurred (ST = 51h, ER = 14h).
At command issuance (Shadow Block Registers setting contents)
CM X’97’ or X’E3’
DH x x x x xx
CH
CL
SN
SC
FR
xx
xx
xx
Period of timer
xx
C141-E254 5-51
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