Western Digital Blue WD20SPZX Technical Reference Manual page 47

WORD FIELD DESCRIPTION
Commands and feature sets sup-
ported or enabled
Bit 15: Obsolete
Bit 14: If set, NOP command sup-
ported
Bit 13: If set, Read Buffer command
supported
Bit 12: If set, Write Buffer command
supported
Bit 11: Obsolete
Bit 10: Obsolete
Bit 9: If set, DEVICE RESET command
supported
Bit 8: Obsolete (SERVICE interrupt
enabled)
85
Bit 7: Obsolete (Release Interrupt
enabled)
Bit 6: If set, Read look-ahead enabled
Bit 5: If set, Volatile Write cache
enabled
Bit 4: Shell be cleared to 0 to indicate
that the PACKET feature set is not
supported
Bit 3: Shell be set to 1 to indicate that
the Mandatory Power Management
feature set is supported
Bit 2: Obsolete
Bit 1: If set, Security Feature Set
enabled
Bit 0: If set, SMART Feature Set
enabled
Commands and feature sets sup-
ported or enabled
Bit 15: If set, Words 119-120 are valid
Bit 14: Reserved
Bit 13: If set, Flush Cache EXT com-
mand supported
Bit 12: If set, Flush Cache command
supported
Bit 11: Obsolete
Bit 10: If set, 48-bit Address Feature
Set supported
Bit 9-8: Obsolete
86
Bit 7: Obsolete (Reserved for Address
offset reserved Area Boot Method)
Bit 6: If set, Set Features subcom-
mand required to spin-up after
power-up
Bit 5: If set, PUIS feature set enabled
Bit 4: Obsolete
Bit 3: If set, APM feature set enabled
Bit 2: If set, CFA Feature Set enabled
Bit 1: Obsolete
Bit 0: If set, Download Microcode
command supported
WESTERN DIGITAL CONFIDENTIAL
ATA Command Set
F=fixed
V=variable
X= not defined
- 47 -
Drive Program
Power-on Default Value
X
F
F
F
X
X
F
X
7069h
X
V
V
F
F
X
V
V
F
F
F
X
F
X
B449h
X
F
V
X
V
F
X
F