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Table 5.30 FEATURE CONTROL COMMAND
Byte Name Value Description
000h
001h
Action Code 0004h FEATURE CONTROL COMMAND
0001h
Set New State
Return Current State
002h
003h
Function Code
0003h
Return Option Flag
Current Option Flag is displayed in SN/SC field.
0001h Write Cache
0002h
Write Reordering
004h
005h
Feature Code
0003h Set time interval for temperature logging
Feature Code = 0001h (Set Write Cache)
0001h: Allow write cache operation to be determined
by ATA Set Feature command.
0002h: Force Write Cache enabled.
0003h: Force Write Cache disable.
Feature Code = 0002h(Set Write Reordering)
0001h: Enable Write Reordering
0002h: Disable Write Reordering
006h
007h
New State (2 byte)
Feature Code = 0003h(Set time interval)
0000h: Invalid
0001h-FFFFh: Logging interval in minutes
(ex.) 0001h: Temperature data collection
interval is 1min.
000Fh: Temperature data collection
interval is 15min.
008h
009h
Option Flag (2 byte)
Bit 15-1: Reserved
Bit0: 1 = Maintain the state at COMRESET/Power
cycle.
0 = Revert to default setting at
COMRESET/Power cycle.
00Ah
to
1FFh
(Reserved) - Reserved
0002h
Current Feature Control State is displayed in SN/SC
field.
5-80 C141-E249