General Description
The Realtek RTL8111H-CG/RTL8111HS-CG 10/100/1000M Ethernet controller combines a triple-speed
IEEE 802.3 compliant Media Access Controller (MAC) with a triple-speed Ethernet transceiver, PCI
Express bus controller, and embedded memory. With state-of-the-art DSP technology and mixed-mode
signal technology, the RTL8111H/RTL8111HS offers high-speed transmission over CAT 5 UTP cable or
CAT 3 UTP (10Mbps only) cable. Functions such as Crossover Detection and Auto-Correction, polarity
correction, adaptive equalization, cross-talk cancellation, echo cancellation, timing recovery, and error
correction are implemented to provide robust transmission and reception capability at high speeds.
The RTL8111H/RTL8111HS supports the PCI Express 1.1 bus interface for host communications with
power management, and complies with the IEEE 802.3u specification for 10/100Mbps Ethernet and the
IEEE 802.3ab specification for 1000Mbps Ethernet. It supports an auxiliary power auto-detect function,
and will auto-configure related bits of the PCI power management registers in PCI configuration space.
The RTL8111H/RTL8111HS features embedded One-Time-Programmable (OTP) memory. The
RTL8111H provides a built-in LDO regulator, and the RTL8111HS provides a built-in switching
regulator.
Advanced Configuration Power management Interface (ACPI)—power management for modern
operating systems that are capable of Operating System-directed Power Management (OSPM)—is
supported to achieve the most efficient power management possible. PCI MSI (Message Signaled
Interrupt) and MSI-X are also supported.
In addition to the ACPI feature, remote wake-up (including AMD Magic Packet and Microsoft Wake-Up
Frame) is supported in both ACPI and APM (Advanced Power Management) environments. To support
WOL from a deep power down state (e.g., D3cold, i.e., main power is off and only auxiliary exists), the
auxiliary power source must be able to provide the needed power for the RTL8111H/RTL8111HS. To
further reduce power consumption, the RTL8111H/RTL8111HS also supports PCIe L1.Off and
L1.Snooze.
The RTL8111H/RTL8111HS supports ‘RealWoW!’ technology that enables remote wake-up of a sleeping
PC through the Internet. This feature allows PCs to reduce power consumption by remaining in low
power sleeping state until needed.
Note: The ‘RealWoW!’ service requires registration on first time use.
The RTL8111H/RTL8111HS supports Protocol offload. It offloads some of the most common protocols to
NIC hardware in order to prevent spurious wake-up and further reduce power consumption. The
RTL8111H/RTL8111HS can offload ARP (IPv4) and NS (IPv6) protocols while in the D3 power saving
state.
The RTL8111H/RTL8111HS supports the ECMA (European Computer Manufacturers Association) proxy
for sleeping hosts standard. The standard specifies maintenance of network connectivity and presence via
proxies in order to extend the sleep duration of higher-powered hosts. It handles some network tasks on
behalf of the host, allowing the host to remain in sleep mode for longer periods. Required and optional
behavior of an operating proxy includes generating reply packets, ignoring packets, and waking the host.
The RTL8111H/RTL8111HS supports IEEE 802.3az-2010, also known as Energy Efficient Ethernet
(EEE). IEEE 802.3az-2010 operates with the IEEE 802.3 Media Access Control (MAC) sublayer to
support operation in Low Power Idle mode. When the Ethernet network is in low link utilization, EEE
allows systems on both sides of the link to save power.
The RTL8111H/RTL8111HS is fully compliant with Microsoft NDIS5, NDIS6 (IPv4, IPv6, TCP, UDP)
Checksum and Segmentation Task-offload (Large send and Giant send) features, and supports IEEE 802
IP Layer 2 priority encoding and IEEE 802.1Q Virtual bridged Local Area Network (VLAN). The above
features contribute to lowering CPU utilization, especially benefiting performance when in operation on a
network server.
The RTL8111H/RTL8111HS supports Receive-Side Scaling (RSS) to hash incoming TCP connections
and load-balance received data processing across multiple CPUs. RSS improves the number of
transactions per second and number of connections per second, for increased network throughput.
The device features inter-connect PCI Express technology. PCI Express is a high-bandwidth,
low-pin-count, serial, interconnect technology that offers significant improvements in performance over
conventional PCI and also maintains software compatibility with existing PCI infrastructure.
The RTL8111H/RTL8111HS is suitable for multiple market segments and emerging applications, such as
desktop, mobile, workstation, server, communications platforms, and embedded applications.

Features
Hardware
„ Integrated 10/100/1000M transceiver
„ Supports Giga Lite (500M) mode
„ Auto-Negotiation with Next Page capability
„ Supports PCI Express 1.1
„ Supports pair swap/polarity/skew correction
„ Crossover Detection & Auto-Correction
„ Supports 1-Lane 2.5Gbps PCI Express Bus
„ Embedded OTP memory
„ Supports hardware ECC (Error Correction
Code) function
„ Supports hardware CRC (Cyclic
Redundancy Check) function
„ Transmit/Receive on-chip buffer support
„ Supports PCI MSI (Message Signaled
Interrupt) and MSI-X
„ Supports 25MHz or 48MHz Oscillator
„ Built-in switching (RTL8111HS) and LDO
(RTL8111H) regulator
„ Supports power down/link down power
saving/PHY disable mode
„ Customized LEDs
„ Controllable LED Blinking Frequency and
Duty Cycle
„ 32-pin QFN ‘Green’ package
„ Supports EMAC-393 ECMA ProxZzzy
Standard for sleeping hosts
„ XTAL-Less Wake-On-LAN
„ LAN disable with GPIO pin
„ Supports LTR (Latency Tolerance
Reporting)
„ Wake-On-LAN and ‘RealWoW!’
Technology (remote wake-up) support
„ Supports 32-set 128-byte Wake-Up Frame
pattern exact matching
„ Supports Microsoft WPI (Wake Packet
Indication)
„ Supports PCIe L1.Off and L1.Snooze
IEEE
„ Fully compliant with IEEE 802.3,
IEEE 802.3u, IEEE 802.3ab
„ Supports IEEE 802.1P Layer 2 Priority
Encoding
„ Supports IEEE 802.1Q VLAN tagging
„ Supports IEEE 802.3az-2010 (EEE)
„ Supports Full Duplex flow control
(IEEE 802.3x)
Software Offload
„ Microsoft NDIS5, NDIS6 Checksum
Offload (IPv4, IPv6, TCP, UDP) and
Segmentation Task-offload (Large send v1
and Large send v2) support
„ Supports jumbo frame to 9K bytes
„ Supports quad core Receive-Side Scaling
(RSS)
„ Supports Protocol Offload (ARP & NS)

System Applications
„ PCI Express 10/100/1000M Ethernet on Motherboard, Notebook, or Embedded systems