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Packet
6. ATA Command Specification
SONY AIT-2 Turbo drive SDX-560V series Ver.1.0
6-21
Interrupt reason register -
REL is cleared to zero.
I/O is cleared to zero if the transfer is to the device. Is set to one if the transfer is to the host.
C/D is cleared to zero indicating the transfer of data.
Device/Head register -
DEV indicates the selected device.
Status register -
BSY is cleared to zero.
DRDY is na.
DF is cleared to zero.
DSC is set to one.
DRQ is set to one.
CHK is cleared to zero.
Successful command completion
When the Sony ATAPI Drive has completed the command without error, the Sony ATAPI Drive sets the following
register content.
Register
7 6 5 4 3 2 1 0
Error
na
Interrupt reason
(Sector Count)
Reserved (00h)
REL
I/O
C/D
Sector Number
na
Byte count low
(Cylinder Low)
na
Byte count high
(Cylinder High)
na
Device/Head
1 na 1 DEV na na na na
Status
BSY DRDY DF DSC DRQ na na CHK
Byte count high/low registers - na
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.
DRDY is set to one.
DF is cleared to zero.
DSC is set to one.
DRQ is cleared to zero.
CHK is cleared to zero.
Error outputs
The Sony ATAPI Drive doesn’t terminate the PACKET command with an error before the last byte of the
command packet has been written.