Sony AIT-SDX470 Product Specifications Manual page 71

Standby Immediate
Status register -
BSY is cleared to zero when 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 bit is set to one.
Prerequisites
DRDY set equal to one.
Description
This command causes the Sony ATAPI Drive immediately to enter the Standby mode. INTRQ is asserted even
though the Sony ATAPI Drive does not have fully transitioned to Standby mode.
Signature and Persistence
A device implementing the PACKET command feature set shall place the signature in the Command Block
registers listed below for power on reset, hardware reset, software reset, the EXECUTE DEVICE DIAGNOSTIC
command, and the DEVICE RESET command. The DEVICE RESET command shall not change the value of the
DEV bit when writing the signature into the Device/Head register for a device implementing the PACKET
command feature set. If the device implements the PACKET command feature set, the signature is also written in
the registers for the IDENTIFY DEVICE and READ SECTOR(S)
commands.
This device implements the PACKET command feature set, therefore the signature shall be:
The PACKET command feature set is implemented by this device, therefore the signature values written by the
device in the Command Block registers following power on reset, hardware reset, software reset, or the DEVICE
RESET command shall not be changed by the device until the device receives a command that sets DRDY to one.
These commands are a PACKET command or an IDENTIFY PACKET DEVICE command. Writes by the host to
the Command Block registers that contain the signature values shall overwrite the signature values and invalidate
the signature.
SONY AIT-1 Turbo drive SDX-470V series Ver.1.0
Table 6-6: ATAPI Identification Signature
Register
Sector Count
Sector Number
Cylinder Low
Cylinder High
6. ATA Command Specification
Value
01h
01h
14h
EBh
6-29