Intel E3815 FH8065301567411 Data Sheet

Intel

®

 Atom™ Processor E3800 Product Family

1976

Datasheet

Default: 00000004h

Memory Mapped I/O Register

(Size: 32 bits)

PCI Configuration Register (Size: 32 bits)

[B:0, D:19, F:0] + 24h

31

28

24

20

16

12

8

4

0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0

IC

C

AS

P

AL

PE

DLA

E

ATA

PI

AP

ST

E

FBSCP

ES

P

CPD

MPSP

HP

CP

PMA

RSV

D

0

CR

FR

MPS

S

CCS

RSV

D

1

PS

P

AP

S

E

FR

E

CL

O

PO

D

SU

D

ST

31:28

0h

RW

This is a four bit field which can be used to 

control reset and power states of the interface. If the Link layer is currently in the 

L_IDLE state, writes to this field shall cause the HBA to initiate a transition to the 

interface power management state requested. If the Link layer is not currently in the 

L_IDLE state, writes to this field shall have no effect. Fh -9h Reserved. 8h DEVSLP: This 

shall cause the HBA to assert the DEVSLP signal associated with the port; the HBA shall 

ignore the DEVSLP Idle Timeout value specified by PxDEVSLP.DITO. Software shall only 

request DEVSLP when the interface is in an idle state (i.e. PxCI is cleared to 0h and 

PxSACT is cleared to 0h); if the interface is not idle at the time the register is written, 

then the HBA takes no action and the interface remains in its current state. If 

PxCAP2.DESO is set to '1' and PxSSTS.IPM is not set to '6h', then the HBA takes no 

action and the interface remains in its current state. Additionally, the HBA shall not 

assert the DEVSLP signal until PHYRDY has been achieved (after a previous de-

assertion). 7h Reserved 6h Slumber: This shall cause the HBA to request a transition of 

the interface to the Slumber state. The SATA device may reject the request and the 

interface shall remain in its current state. 5h-3h Reserved. 2h Partial: This shall cause 

the HBA to request a transition of the interface to the Partial state. The SATA device may 

reject the request and the interface shall remain in its current state. 1h Active: This 

shall cause the HBA to request a transition of the interface into the active state. If the 

requested transition is from the DEVSLP state, then the HBA shall wait until 

PxDEVSLP.DMAT has expired before de-asserting the DEVSLP signal. 0h No-Op / Idle: 

When software reads this value, it indicates the HBA is ready to accept a new interface 

control command, although the transition to the previously selected state may not yet 

have occurred. When system software writes a non-reserved value other than No-Op 

(0h), the HBA shall perform the action and update this field back to Idle (0h). If 

software writes to this field to change the state to a state the link is already in (i.e. 

interface is in the active state and a request is made to go to the active state), the HBA 

shall take no action and return this field to Idle. If the interface is in a low power state 

and the software wants to transition to a different low power state, software must first 

bring the link to active and then initiate the transition to the desired low power state 

(with the exception of DEVSLP). The transition to DEVSLP may occur from any other 

state if CAP2.DESO is cleared to '0'. If CAP2.DESO is set to '1', then DEVSLP may only 

be transitioned to if the link is in Slumber.

27

0h

RW

When set to 1, and the ALPE bit is set, the HBA 

shall aggressively enter Slumber state when it clears a bit in the PxCI or PxSACT 

register and the register values are 0h. When cleared, and the ALPE bit is set, the HBA 

will aggressively enter Partial state when it clears a bit in the PxCI or PxSACT register 

and the register values are both 0h. If CAP.SALP is cleard to 0, software shall treat this 

bit as reserved.

26

0h

RW

When set, the HBA will 

aggressively enter a lower link power state (Partial or Slumber) based upon the setting 

of the ASP bit.

25

0h

RW

When set, the HBA will drive the LED pin active 

for commands regardless of the state of PxCMD.ATAPI. When cleared, the HBA will only 

drive the LED pin active for commands if PxCMD.ATAPI is set to 0. This bit is set by 

software