6. ATA Command Specification
Packet
SONY AIT-1 Turbo drive SDX-460V series Ver.1.0
6-22
Register
7 6 5 4 3 2 1 0
Error
Sense key
na
ABRT
EOM
ILI
Interrupt reason
(Sector Count)
Reserved (00h)
REL
I/O
C/D
Sector Number
na
Byte count low
na
Byte count high
na
Device/Head
1 na 1 DEV na na na na
Status
BSY DRDY DF DSC DRQ na na CHK
Error register -
Sense Key is a command packet set specific error indication.
ABRT is set to one if the requested command has been aborted because the command code or a
command parameter is invalid. ABRT may be set to one if the Sony ATAPI Drive is not able to
complete the command.
EOM - the meaning of this bit is command set specific. See the appropriate command set standard for
its definition.
ILI - the meaning of this bit is command set specific. See the appropriate command set standard for its
definition.
Interrupt reason register -
REL is cleared to zero.
I/O is set to one.
C/D is set to one.
Device/Head register -
DEV indicates the selected device.
Status register -
BSY is cleared to zero indicating the command is completed.
DRDY is set to one.
DF is set to one if a device fault has occurred.
DSC is set to one.
DRQ is cleared to zero.
CHK is set to one if an Error register sense key or code bit is set.
Prerequisites
This command is accepted regardless of the state of DRDY.
Description
The PACKET command is used to transfer a device command via a command packet. If the native form of the
encapsulated command is shorter than the packet size reported in bits 1 and 0 of word 0 of the IDENTIFY
PACKET DEVICE response, the encapsulated command shall begin at byte 0 of the packet. Packet bytes beyond
the end of the encapsulated command are reserved.