W89C840AF 데이터 시트보기 (PDF) - Winbond

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W89C840AF

100/10Mbps Ethernet Controller

Winbond 

W89C840AF

3,74,85,8

8,97,103,

109,115,

120

Functional Description

Power management functions

The W89C840AF supports power management as defined in the PCI Bus Power Management

Interface Specification Rev 1.0 and Network Device Class Power Management Reference

Specification V1.0a and ACPI Specification Rev 1.0. These three specifications define how a PCI

network device can be controlled in an Operating System Directed Power Management (OSPM)

environment.

Power management state and wake-Up events operation

A power management event (PME) is a device used to report events that might change the system’s

power state. Typically, a device uses a PME to request a change from a power savings state to the fully

operational power state. However, a device could use a PME to request a change to a lower power state.

The following two power management events for W89C840AF are defined in Network Device Class

Power Management Reference Specification V1.0a.

Magic Packet: Magic packet is a packet composed of a sequence of specific bits pattern and is used to

notice mother board to run a wake-up process. It is consisted of the form of Destination Mac address +

Source MAC address + data + CRC.

Wake-up frame:

Wake-Up events notification

The W89C840AF can wake-up the system when it receive a frame that matches as a wake-up packet.

This packet can be configured to be one or both of the the following:

l Magic Packet (see Magic Packet).

l The received wake-up frame matches one of the W89C840AF active address filtering and CRC

check mechanisms.

The W89C840AF can be enabled to provided wake-up notification upon the occurrence of a PME. The

system software enables the PMEB signal (pin 118) by setting the PME_EN bit in the Power Management

Control and Status Register (FPMCSR) and clear this bit deassert the PMEB signal. When a wake-up event

is detected, the W89C840AF sets the PME_STS bit in the FPMCSR register setting this bit causes the PMEB

signal to be asserted. Assertion of the PMEB signal causes external hardware to be wake up the system.

If there is not any power supplying PCI slot and W89C840AF, the PMEB signal will stay at low when

W89C840AF adapter card is inserted into PCI slot.

The W89C840AF detects the network for receipt of Magic Packet and wake-up frame can be enabled to

generate a wake-up notification by setting the MGPE and WUPFE bit of Wake-Up Control and Status

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Publication Release Date:October 2000

Revision 1.01

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