DP83815 datasheet(39/108 Pages) NSC

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4.0 Register Set (Continued)

4.1.12 Power Management Control and Status Register

This register contains PM control and status information.

Bit

Bit Name

Description

24-22

AUX_CURRENT Aux_Current

This 3 bit field reports the 3.3Vaux auxiliary current requirements for the PCI function.

If PMEN generation from D3cold is not supported by the function(PMCAP[31]), this field returns a

value of "000b" when read.

Bit

3.3Vaux

24 23 22

Max. Current Required

1 1 0

320 mA

0 0 0

0 (self powered)

DSI

Device Specific Initialization

This bit is set to 1 to indicate to the system that initialization of the DP83815 device is required

(beyond the standard PCI configuration header) before the generic class device driver is able to use

it. A 1 indicates that DP83815 requires a DSI sequence following transition to the D0 uninitialized

state. This bit can be loaded from the EEPROM.

Reserved

(reads return 0)

PMEC

PME Clock

Returns 0 to indicate PCI clock not needed for PMEN.

18-16

PMV

Power Management Version

This bit field indicates compliance to a specific PM specification rev level. Currently set to 010b.

15-8

NLIPTR

Next List Item Pointer

Offset into PCI configuration space for the location of the next item in the Capabilities Linked List.

Returns 00h as no other capabilities are offered.

7-0

CAPID

Capability ID

Always returns 01h for Power Management ID.

Tag: PMCSR

Size: 32 bits

Hard Reset: 00000000h

Offset: 44h

Access: Read Write

Soft Reset: unchanged

Bit

Bit Name

Description

31-24

Reserved

(reads return 0)

23-16

BSE

Bridge Support Extensions

unused (reads return 0)

PMESTS

PME Status

Sticky bit which represents the state of the PME logic, regardless of the state of the PMEEN bit.

14-9

Reserved

(reads return 0)

PMEEN

PME Enable

When set to 1, this bit enables the assertion of the PME function on the PMEN pin. When 0, the PMEN

pin is forced to be inactive. This value can be loaded from the EEPROM.

7-2

Unused

(reads return 0)

1-0

PSTATE

Power State

This 2 bit field is used to determine the current power state of DP83815, and to set a new power state.

00 - D0

10 - D2

01 - D1

11 - D3hot/cold

DP83815 Datasheet(PDF) 39 Page - National Semiconductor (TI)

DP83815 Datasheet(HTML) 39 Page - National Semiconductor (TI)

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