KSZ9031RNX(2012) Просмотр технического описания (PDF) - Micrel

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Компоненты Описание

производитель

KSZ9031RNX
(Rev.:2012)

Gigabit Ethernet Transceiver with RGMII Support

Micrel 

Micrel, Inc.

KSZ9031RNX

Registers Associated with EEE

The following MMD registers are provided for EEE configuration and management:

• MMD address 3h, register 0h - PCS EEE – Control register

• MMD address 3h, register 1h - PCS EEE – Status register

• MMD address 7h, register 3Ch - EEE Advertisement register

• MMD address 7h, register 3Dh - EEE Link Partner Advertisement register

Wake-On-LAN

Wake-On-LAN (WOL) is normally a MAC-based function to wake up a host system (for example, an Ethernet end device,

such as a PC) that is in standby power mode. Wake-up is triggered by receiving and detecting a special packet

(commonly referred to as the “magic packet”) that is sent by the remote link partner. The KSZ9031RNX can perform the

same WOL function if the MAC address of its associated MAC device is entered into the KSZ9031RNX PHY registers for

magic-packet detection. When the KSZ9031RNX detects the magic packet, it wakes up the host by driving its power

management event (PME) output pin low.

By default, the WOL function is disabled. It is enabled by setting the enabling bit and configuring the associated registers

for the selected PME wake-up detection method.

The KSZ9031RNX provides three methods to trigger a PME wake-up:

• Magic-packet detection

• Customized-packet detection

• Link status change detection

Magic-Packet Detection

The magic packet’s frame format starts with 6 bytes of 0xFFh and is followed by 16 repetitions of the MAC address of its

associated MAC device (local MAC device).

When the magic packet is detected from its link partner, the KSZ9031RNX asserts its PME output pin low.

The following MMD address 2h registers are provided for magic-packet detection:

• Magic-packet detection is enabled by writing a ‘1’ to MMD address 2h, register 10h, bit [6]

• The MAC address (for the local MAC device) is written to and stored in MMD address 2h, registers 11h – 13h

The KSZ9031RNX does not generate the magic packet. The magic packet must be provided by the external system.

Customized-Packet Detection

The customized packet has associated register/bit masks to select which byte, or bytes, of the first 64 bytes of the packet

to use in the CRC calculation. After the KSZ9031RNX receives the packet from its link partner, the selected bytes for the

received packet are used to calculate the CRC. The calculated CRC is compared to the expected CRC value that was

previously written to and stored in the KSZ9031RNX PHY registers. If there is a match, the KSZ9031RNX asserts its PME

output pin low.

Four customized packets are provided to support four types of wake-up scenarios. A dedicated set of registers is used to

configure and enable each customized packet.

The following MMD registers are provided for customized-packet detection:

• Each of the four customized packets is enabled via MMD address 2h, register 10h,

- Bit [2]

// For customized packets, type 0

- Bit [3]

// For customized packets, type 1

- Bit [4]

// For customized packets, type 2

- Bit [5]

// For customized packets, type 3

October 2012

36

M9999-103112-1.0

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