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Preliminary
Model Number :
UJ160ABPSN-B
12. Serial ATA Features (continue)
12-5. DIPM ( Device Initiated link Power Management )
DIPM is a method which controls Serial ATA interface power states by the Logical Unit.
The Logical Unit has internal timers, Partial Timer and Slumber Timer , and the timer provide for the
Logical Unit to change Interface Power State without direct HOST request. The disabled/enabled of
DIPM can be switched by using SET FEATURE command.
12-6. DIPM State Changes
required
Partial
6
PARTIAL
1: A power-on or hard reset always returns the Interface Power State to the PHYRDY state from any state.
2: If the drive received command, the drive keep PHYRDY state and resets the Partial/Slumber Timer.
3: If the drive is set DIPM Enable and the Partial timer reaches zero, the drive issues PMREQ_P.
4: If the drive is set DIPM Enable and the Slumber timer reaches zero, the drive issues PMREQ_S.
5: If the drive received PMNAK from Host, the status changes into PHYRDY.
6: If the drive received PMACK from Host, the status changes into PARTIAL.
7: If the drive received PMACK from Host, the status changes into SLUMBER.
8: If the drive or host issues COMWAKE(or COMRESET/COMINIT), the status changes into PHYRDY.
If the drive changes Interface Power State from PARTIAL to SLUMBER, the drive issues COMWAKE
to enter PHYRDY state. And then, the drive requests to change the state into SLUMBER
KOK-B3-001-T6 Issue 5
Power ON
2
3
PHYRDY
5
8
Panasonic System Networks Co.,Ltd
1
5
8
Optical Devices Business Unit
PAGE
15
/
4
required
Slumber
7
SLUMBER
24
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