UCB1500 데이터 시트보기 (PDF) - Philips Electronics

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UCB1500

PCI to AC97 bridge/host controller

Philips Electronics 

Philips Semiconductors

UCB1500

PCI to AC97 bridge/host controller

[82]: Power Management Capabilities (read only)

Table 12: Power Management Capabilities register bit description

Read only

Bit

Description

15-11(r) PME support

This 5-bit field indicates the power states in which the function may assert PME.

Value is set to 11001 b if VAUX_AV = 1 to indicate PME can be asserted from

D3cold and D0. If VAUX_AV = 0, this field is set to 01001b to indicate PME can be

asserted from D3hot and D0.

The entire setting can be overwritten by BIOS via writing to 6Ah, or an external

EEPROM. If VAUX_AV = 0, bit 15 shall always be zero. If VAUX = 1, bit 15 shall

reflect the setting of 6Ah, or that loaded from EEPROM.

10(r)

D2 support

This bit is set to ‘0’ to indicate that function does not support the D2 power

management state. This setting can be overwritten by BIOS via 6Ah, or with the

external EEPROM.

9(r)

D1 support

This bit is set to ‘0’ to indicate that function does not support the D1 power

management state. This setting can be overwritten by BIOS via 6Ah, or with the

external EEPROM.

8-6(r)

Aux_Current

These bits are set to ‘0’ for PCI-PM 1.0 compliance. For PCI-PM 1.1 compliance,

these bits are overwritten by BIOS via 6Ah, or loaded from an external EEPROM

to reflect the 3.3VAUX current requirement.

5(r)

DSI

The Device Specific Initialization bit indicates whether special initialization of this

function is required (beyond the standard PCI configuration header) before the

generic class device driver is able to use it. This register is set to ‘0’ to indicate

that it does not require special initialization.

4(r)

Reserved.

3(r)

PME Clock

This bit is a ‘0’, indicating that the function does not rely on the presence of the

PCI clock for PME operation.

2:0(r)

Version

This register is set to 001b, indicating that this function complies with Rev 1.0 of

the PCI Power Management Interface Specification. These bits can also be

overwritten by BIOS via 6Ah, or loaded from an external EEPROM to 010b for

compliance with PCI-PM 1.1.

9397 750 06854

Objective specification

Rev. 01 — 4 February 2000

© Philips Electronics N.V. 2000. All rights reserved.

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