Quantum Audio Travan 40 Tape Drive STT3401A - Manual (Page 119)

ATAPI Interface Chapter 5
Seagate Travan 40 Product Manual Page 111
SLEEP (ATA Command E6)
This command provides the only way for the device to enter Sleep mode.
It causes the device to set the BSY bit to one, prepare to enter Sleep mode, clear the
BSY bit to 0 and assert INTRQ. The Host shall read the Status register in order to
clear the interrupt and allow the device to enter Sleep mode. In Sleep mode, the
interface becomes inactive without affecting the operation of the interface. The Host
shall not attempt to access the Command Block registers while the device is in Sleep
mode.
Because some Host systems may not read the Status register and clear the
interrupt, a device may automatically de-assert INTRQ and enter Sleep mode after a
vendor specific time period of not less that 2 seconds. The only way to recover from
Sleep mode is with a SOFTWARE RESET (SRST), a HARDWARE RESET, or a
DEVICE RESET command.
A device shall not power on in Sleep mode nor remain in Sleep mode following a
reset sequence.
Host Taskfile Registers—Inputs
Data Bits
Host Taskfile
Register 7 6 5 4 3 2 1 0 HEX
Features N/A N/A
Sector Count N/A N/A
Sector Number N/A N/A
Byte Count
High N/A N/A
Byte Count
Low N/A N/A
Device/Head Rsvd LBA rsvd DEV SAM LUN (not used)
Command command E6
Host Taskfile Registers—Outputs
Data Bits
Host Taskfile
Register 7 6 5 4 3 2 1 0 HEX
Error Rsvd tag type (not supported) MCH ABRT EOM ILI 00
Sector Count N/A N/A
Sector Number N/A N/A
Byte Count
High N/A
Byte Count
Low N/A
Device/Head Rsvd LBA rsvd DEV SAM LUN (not used)
Status BSY RDY rsvd DSC DRQ Corr rsvd CHK 40 or 50