Western Digital Blue WD20SPZX Technical Reference Manual page 44

WORD FIELD DESCRIPTION
Serial ATA Additional Capabilities
Bit 15-8: Reserved for Serial ATA
Bit 7: DevSleep_to_ReducedPwrState
Bit 6: If set, support RECEIVE FPDMA
QUEUED and SEND FPDMA QUEUED
command
77
Bit 5: If set, support NCQ Queue Man-
agement Command
Bit 4: If set, support NCQ Streaming
Bit 3-1: If set, Coded value indicating
current negotiated SATA signal
speed
Bit 0: Shall be cleared to zero
Serial ATA Features Supported
Bit 15-12: Reserved for Serial ATABit 11
Supports Rebuild Assist
Bit 10: Supports Device Initiated
Interface Power Management
Software Settings Preservation
Bit 9: Supports Hybrid Information
feature
Bit 8: Supports Device Sleep
Bit 7: If set, Device support NCQ
Autosense
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Bit 6: If set, device supports software
settings preservation
Bit 5: if set, device supports Hard-
ware Feature Control
Bit 4: If set, device supports in-order
data delivery
Bit 3: If set, device supports initiating
power management
Bit 2: If set, device supports DMA
Setup Auto-activation
Bit 1: If set, device supports non-zero
buffer offsets
Bit 0: Cleared to zero
Serial ATA Features Enabled
Bits 15-12: Reserved for Serial ATA
Bit 11: If set Rebuild Assist enabled
Bit 10: Reserved
Bit 9: If set Hybrid Information feature
is enabled
Bit 8: If set Device Sleep enabled
Bit 7: If set Automatic Partial to Slum-
ber transitions enable
Bit 6: If set, software settings preser-
79
vation enabled
Bit 5: If set, Hardware Feature Con-
trol is enable
Bit 4: If set, In-order data delivery
enabled
Bit 3: If set, device initiated power
management enabled
Bit 2: If set, DMA Setup Auto-activa-
tion enabled
Bit 1: If set, non-zero buffer offsets
enabled
Bit 0: Cleared to zero
WESTERN DIGITAL CONFIDENTIAL
ATA Command Set
F=fixed
V=variable
X= not defined
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Drive Program
Power-on Default Value
F
F
F
0004h
F
F
V
F
F
F
F
F
F
F
004Ch
F
F
F
F
F
F
F
V
V
0040h
V
V
V
V
V
V
F