UCB1500 データシートの表示（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

[84]: Power Management Control/Status (VAUX powered)

Table 23: Power Management Control/Status register bit description

VAUX powered.

Bit

Description

15

PME Status - Sticky Bit

This bit is set when the function would normally assert the PME signal

independent of the state of the PME_EN bit. This bit is set when a power

management event occurs.

Writing a ‘1’ to this bit will clear it and cause the function to stop asserting a PME

(if enabled). Writing a ‘0’ has no effect.

14-13(r) Data scale

Not implemented.

12-9

Data select

This 4-bit field is used to select which data is to be reported through the Data

register and Data scale field. This function is not implemented in this chip.

8

PME_EN - Sticky Bit

A ‘1’ enables the function to assert PME. When ‘0’, PME assertion is disabled.

7-2(r)

Reserved.

1-0

Power State

This 2-bit field is used both to determine the current power state of a function

and to set the function into a new power state. The definition of the field values is

given below.

00b - D0

01b - D1

10b - D2

11b - D3hot

If software writes D1 or D2 and the corresponding bit 10 or 9 or register 82

indicates it is not supported, the state change is discarded.

[86-87]: Reserved

9397 750 06854

Objective specification

Rev. 01 — 4 February 2000

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

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