7.19 Power Management Capabilities Register

The power management capabilities register indicates the capabilities of the PCI7x21/PCI7x11 controller related to PCI power management. See Table 7−16 for a complete description of the register contents.

Bit

15

 

14

13

 

12

11

10

9

8

7

6

5

4

3

2

1

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Name

 

 

 

 

 

 

 

 

Power management capabilities

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Type

RU

 

R

R

 

R

R

R

R

R

R

R

R

R

R

R

R

R

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Default

0

 

1

1

 

1

1

1

1

0

0

0

0

0

0

0

1

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Register:

Power management capabilities

 

 

 

 

 

 

 

 

 

Offset:

 

46h

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Type:

 

Read/Update, Read-only

 

 

 

 

 

 

 

 

 

 

 

Default:

 

7E02h

 

 

 

 

 

 

 

 

 

 

 

 

 

Table 7−16. Power Management Capabilities Register Description

BIT

FIELD NAME

TYPE

 

 

 

DESCRIPTION

 

 

 

 

 

 

 

 

 

 

 

 

support from D3cold. This bit can be set to 1 or cleared to 0 via bit 15 (PME_D3COLD) in the PCI

 

 

 

 

PME

 

 

 

 

 

miscellaneous configuration register at offset F0h in the PCI configuration space (see Section 7.23).

15

PME_D3COLD

RU

 

The PCI miscellaneous configuration register is loaded from ROM. When this bit is set to 1, it indicates

 

that the PCI7x21/PCI7x11 controller is capable of generating a PME wake event from D3cold. This bit

 

 

 

 

 

 

 

 

state is dependent upon the PCI7x21/PCI7x11 VAUX implementation and may be configured by using

 

 

 

 

bit 15 (PME_D3COLD) in the PCI miscellaneous configuration register (see Section 7.23).

 

 

 

 

 

 

 

 

 

 

 

support. This 4-bit field indicates the power states from which the PCI7x21/PCI7x11 controller

 

 

 

 

PME

14−11

PME_SUPPORT

R

 

may assert PME. This field returns a value of 1111b by default, indicating that PME may be asserted

 

 

 

 

from the D3hot, D2, D1, and D0 power states.

10

D2_SUPPORT

R

 

D2 support. Bit 10 is hardwired to 1, indicating that the PCI7x21/PCI7x11 controller supports the D2

 

power state.

 

 

 

 

 

 

 

 

 

9

D1_SUPPORT

R

 

D1 support. Bit 9 is hardwired to 1, indicating that the PCI7x21/PCI7x11 controller supports the D1

 

power state.

 

 

 

 

 

 

 

 

 

 

 

 

 

Auxiliary current. This 3-bit field reports the 3.3-VAUXauxiliary current requirements. When bit 15

8−6

AUX_CURRENT

R

 

(PME_D3COLD) is cleared, this field returns 000b; otherwise, it returns 001b.

 

000b = Self-powered

 

 

 

 

 

 

 

 

001b = 55 mA (3.3-VAUXmaximum current required)

 

 

 

 

Device-specific initialization. This bit returns 0 when read, indicating that the PCI7x21/PCI7x11

5

DSI

R

 

controller does not require special initialization beyond the standard PCI configuration header before

 

 

 

 

a generic class driver is able to use it.

 

 

 

 

 

4

RSVD

R

 

Reserved. Bit 4 returns 0 when read.

 

 

 

 

 

 

 

 

 

 

 

clock. This bit returns 0 when read, indicating that no host bus clock is required for the

3

PME_CLK

R

 

PME

 

PCI7x21/PCI7x11 controller to generate PME.

 

 

 

 

 

 

 

 

 

 

 

 

 

Power-management version. This field returns 010b when read, indicating that the PCI7x21/PCI7x11

2−0

PM_VERSION

R

 

controller is compatible with the registers described in the PCI Bus Power Management Interface

 

 

 

 

Specification (Revision 1.1).

 

 

 

 

 

 

 

7−13

Page 173
Image 173
Texas Instruments PCI7611, PCI7411, PCI7621, PCI7421 manual 16. Power Management Capabilities Register Description