Integrated 10/100/1000M Ethernet Transceiver
Track ID: JATR-8275-15 Rev. 1.1
The received differential signal is converted into a Manchester-encoded stream first. Next, the stream is
processed with a Manchester decoder, and is de-serialized into 4-bit-wide nibbles. The 4-bit nibbles are
presented to the RGMII interface at a clock speed of 2.5MHz.
7.3. Energy Efficient Ethernet (EEE)
The RTL8211F(I)/RTL8211FD(I) supports IEEE 802.3az-2010, also known as Energy Efficient Ethernet
(EEE), at 10Mbps, 100Mbps, and 1000Mbps. It provides a protocol to coordinate transitions to/from a
lower power consumption level (Low Power Idle mode) based on link utilization. When no packets are
being transmitted, the system goes to Low Power Idle mode to save power. Once packets need to be
transmitted, the system returns to normal mode, and does this without changing the link status and without
To save power, when the system is in Low Power Idle mode, most of the circuits are disabled, however, the
transition time to/from Low Power Idle mode is kept small enough to be transparent to upper layer
protocols and applications.
EEE also specifies a negotiation method to enable link partners to determine whether EEE is supported.
Refer to http://www.ieee802.org/3/az/index.html for more details.
7.4. Wake-On-LAN (WOL)
The RTL8211F(I)/RTL8211FD(I) can monitor the network for a Wakeup Frame or a Magic Packet, and
notify the system via the PMEB (Power Management Event; ‘B’ means low active) pin when such a packet
or event occurs
1. The system can then be restored to a normal state to process incoming jobs. The PMEB
pin needs to be connected with a 4.7k-ohm resistor and pulled up to 3.3V. When the Wakeup Frame or a
Magic Packet is sent to the PHY, the PMEB pin will be set low to notify the system to wake up. Refer to the
WOL application note for details.
Magic Packet Wakeup occurs only when the following conditions are met:
• The destination address of the received Magic Packet is acceptable to the RTL8211F(I)/RTL8211FD(I),
e.g., a broadcast, multicast, or unicast packet addressed to the current RTL8211F(I)/RTL8211FD(I).
• The received Magic Packet does not contain a CRC error.
• The Magic Packet pattern matches; i.e., 6 * FFh + MISC (can be none) + 16 * DID (Destination ID) in
any part of a valid Ethernet packet.