PCI6421 datasheet(107/204 Pages) TI

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4−31

4.43 Power Management Capabilities Register

The power management capabilities register contains information on the capabilities of the PC Card function related

to power management. Both PCI6x21/PCI6x11 CardBus bridge functions support D0, D1, D2, and D3 power states.

Default register value is FE12h for operation in accordance with PCI Bus Power Management Interface Specification

revision 1.1. See Table 4−19 for a complete description of the register contents.

Bit

Name

Power management capabilities

Type

Default

Power management capabilities

Offset:

A2h (Functions 0, 1)

Type:

Read-only, Read/Write

Default:

FE12h

Table 4−19. Power Management Capabilities Register Description

BIT

SIGNAL

TYPE

FUNCTION

This 5-bit field indicates the power states from which the PCI6x21/PCI6x11 controller functions can assert

PME. A 0 for any bit indicates that the function cannot assert the PME signal while in that power state.

These 5 bits return 11111b when read. Each of these bits is described below:

15 ‡

PME support

Bit 15 − defaults to a 1 indicating the PME signal can be asserted from the D3cold state. This bit is read/write

because wake-up support from D3cold is contingent on the system providing an auxiliary power source

to the VCC terminals. If the system designer chooses not to provide an auxiliary power source to the VCC

terminals for D3cold wake-up support, then BIOS must write a 0 to this bit.

14−11

Bit 14 − contains the value 1 to indicate that the PME signal can be asserted from the D3hot state.

Bit 13 − contains the value 1 to indicate that the PME signal can be asserted from the D2 state.

Bit 12 − contains the value 1 to indicate that the PME signal can be asserted from the D1 state.

Bit 11 − contains the value 1 to indicate that the PME signal can be asserted from the D0 state.

D2_Support

This bit returns a 1 when read, indicating that the function supports the D2 device power state.

D1_Support

This bit returns a 1 when read, indicating that the function supports the D1 device power state.

8−6

RSVD

Reserved. These bits return 000b when read.

DSI

Device-specific initialization. This bit returns 0 when read.

AUX_PWR

Auxiliary power source. This bit is meaningful only if bit 15 (D3cold supporting PME) is set. When this bit

is set, it indicates that support for PME in D3cold requires auxiliary power supplied by the system by way

of a proprietary delivery vehicle.

A 0 (zero) in this bit field indicates that the function supplies its own auxiliary power source.

If the function does not support PME while in the D3cold state (bit 15=0), then this field must always return

PMECLK

When this bit is 1, it indicates that the function relies on the presence of the PCI clock for PME operation.

When this bit is 0, it indicates that no PCI clock is required for the function to generate PME.

Functions that do not support PME generation in any state must return 0 for this field.

2−0

Version

These 3 bits return 010b when read, indicating that there are 4 bytes of general-purpose power

management (PM) registers as described in draft revision 1.1 of the PCI Bus Power Management Interface

Specification.

‡ One or more bits in this register are cleared only by the assertion of GRST.

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