ATA Bus Interface and ATA Commands
6-40 Quantum Fireball Plus AS 10.2/20.5/30.0/40.0/60.0 GB AT
NORMAL OUTPUTS - None
ERROR OUTPUTS - If the device does not support this command, if SMART is
disabled or if the values in the Features, Cylinder Low or Cylinder High registers
are invalid, an Aborted command error is posted.
PREREQUISITES - DRDY set equal to one. SMART enabled.
DESCRIPTION - This command enables and disables the optional attribute
autosave feature of the device. Depending upon the implementation, this command
may either allow the device, after some vendor specified event, to automatically save
its updated attribute values to non-volatile memory; or this command may cause the
autosave feature to be disabled. The state of the attribute autosave feature (either
enabled or disabled) will be preserved by the device across power cycles.
A value of zero written by the host into the device’s Sector Count register before
issuing this command will cause this feature to be disabled. Disabling this feature
does not preclude the device from saving attribute values to non-volatile memory
during some other normal operation such as during a power-on or power-off
sequence or during an error recovery sequence.
A value of F1h written by the host into the device’s Sector Count register before
issuing this command will cause this feature to be enabled. Any other meaning of
this value or any other non-zero value written by the host into this register before
issuing this command is vendor specific. The meaning of any non-zero value written
to this register at this time will be preserved by the device across power cycles.
If the SMART ENABLE/DISABLE ATTRIBUTE AUTOSAVE command is
supported by the device, upon receipt of the command from the host, the device sets
BSY, enables or disables the autosave feature (depending on the implementation),
clears BSY and asserts INTRQ.
If this command is not supported by the device, the device shall abort the command
upon receipt from the host, returning the Aborted command error.
During execution of the autosave routine the device shall not assert BSY nor
deassert DRDY. If the device receives a command from the host while executing its
autosave routine it must respond to the host within two seconds.
Register
RegisterRegister
Register 7
77
76
66
65
55
54
44
43
33
32
22
21
11
10
00
0
Error na UNC na IDNF na ABRT na na
Sector Count na
Sector Number na
Cylinder Low na
Cylinder High na
Device/Head obs na obs DEV na
Status BSY DRDY DF na DRQ na na ERR
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