PCI7421 datasheet(173/298 Pages) TI

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7−13

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

Name

Power management capabilities

Type

Default

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

PME_D3COLD

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

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

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).

14−11

PME_SUPPORT

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

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.

D2_SUPPORT

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

power state.

D1_SUPPORT

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

power state.

8−6

AUX_CURRENT

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

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

000b = Self-powered

001b = 55 mA (3.3-VAUX maximum current required)

DSI

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

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

a generic class driver is able to use it.

RSVD

Reserved. Bit 4 returns 0 when read.

PME_CLK

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

PCI7x21/PCI7x11 controller to generate PME.

2−0

PM_VERSION

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

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

Specification (Revision 1.1).

PCI7421 Datasheet(PDF) 173 Page - Texas Instruments

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