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Micrel, Inc.
KSZ9692PB, KSZ9692PB-S
or simply network traffic directly targeted to the local system. In all of these instances, the network device is pre-programmed
by the policy owner or other software with information on how to identify wake frames from other network traffic.
A wake-up event is a request for hardware and/or software external to the network device to put the system into a
powered state.
A wake-up signal is caused by:
1. Detection of a change in the network link state
2. Receipt of a network wake-up frame
3. Receipt of a Magic Packet
There are also other types of wake-up events that are not listed here as manufacturers may choose to implement these in
their own way.
Link Change
Link status wake events are useful to indicate a change in the network’s availability, especially when this change may
impact the level at which the system should re-enter the sleeping state. For example, a change from link off to link on may
trigger the system to re-enter sleep at a higher level (D2 versus D3 1 ) so that wake frames can be detected. Conversely, a
transition from link on to link off may trigger the system to re-enter sleep at a deeper level (D3 versus D2) since the
network is not currently available.
Wake-up Packet
Wake-up packets are certain types of packets with specific CRC values that a system recognizes to as a ‘wake up’ frame.
The KSZ9692PB, KSZ9692PB-S supports up to four user defined wake-up frames on each network controller port:
Magic Packet
Magic Packet technology is used to remotely wake up a sleeping or powered off PC or device on a network. This is
accomplished by sending a specific packet of information, called a Magic Packet frame, to a node on the network. When a
PC or device capable of receiving the specific frame goes to sleep, it enables the Magic Packet RX mode in the network
controller, and when the network controller receives a Magic Packet frame, it will alerts the system to wake up.
Magic Packet is a standard feature integrated into the KSZ9692PB, KSZ9692PB-S. The controller implements multiple
advanced power-down modes including Magic Packet to conserve power and operate more efficiently.
Once the KSZ9692PB, KSZ9692PB-S has been put into Magic Packet Enable mode, it scans all incoming frames
addressed to the node for a specific data sequence, which indicates to the controller this is a Magic Packet (MP) frame.
A Magic Packet frame must also meet the basic requirements for the network technology chosen, such as Source
Address (SA), or Destination Address (DA), which may be the receiving station’s IEEE address or a multicast or broadcast
address and CRC.
The specific sequence consists of 16 duplications of the IEEE address of this node, with no breaks or interruptions. This
sequence can be located anywhere within the packet, but must be preceded by a synchronization stream. The
synchronization stream allows the scanning state machine to be much simpler. The synchronization stream is defined as
6 bytes of XoffFFh. The device will also accept a broadcast frame, as long as the 16 duplications of the IEEE address
match the address of the machine to be awakened.
Example:
If the IEEE address for a particular node on a network is 11h 22h, 33h, 44h, 55h, 66h, the network controller would be
scanning for the data sequence (assuming an Ethernet frame):
DESTINATION SOURCE – MISC - .: FF FF FF FF FF FF - 11 22 33 44 55 66 - 11 22 33 44 55 66 - 11 22 33 44 55 66 -
11 22 33 44 55 66 - 11 22 33 44 55 66 - 11 22 33 44 55 66 - 11 22 33 44 55 66 - 11 22 33 44 55 66 - 11 22 33 44 55 66 -
11 22 33 44 55 66 - 11 22 33 44 55 66 - 11 22 33 44 55 66 - 11 22 33 44 55 66 - 11 22 33 44 55 66 - 11 22 33 44 55 66 -
11 22 33 44 55 66 - MISC - CIRC.
There are no further restrictions on a Magic Packet frame. For instance, the sequence could be in a TCP/IP packet or an
IPX packet. The frame may be bridged or routed across the network without affecting its ability to wake-up a node at the
1
References to D0, D1, D2, and D3 are power management states defined in a similar fashion to the way they are defined for PCI. For
more information, refer to the PCI specification at www.pcisig.com/specifications/conventional/pcipm1.2.pdf.
May 2011
38
M9999-051111-4.0
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RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray
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