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USING THIS DOCUMENT
This document is intended for the software engineer’s reference and provides detailed programming
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6.2.1. Link Monitor...........................................................................................................................................................8
6.2.3. Tx LED ...................................................................................................................................................................9
6.2.5. LINK/ACT LED .................................................................................................................................................... 11
6.9.5. Message Address for MSI-X Table Entries ...........................................................................................................22
6.9.6. Message Upper Address for MSI-X Table Entries ................................................................................................23
6.9.7. Message Data for MSI-X Table Entries ................................................................................................................23
6.9.8. Vector Control for MSI-X Table Entries ...............................................................................................................23
6.9.9. Pending Bits for MSI-X PBA Entries....................................................................................................................23
Figure 2. Rx LED .....................................................................................................................................9
Figure 10. Serial EEPROM Interface Timing ..........................................................................................28
Figure 11. Single-Ended Measurement Points for Absolute Cross Point and Swing...............................33
Figure 12. Single-Ended Measurement Points for Delta Cross Point ......................................................33
Figure 13. Single-Ended Measurement Points for Rise and Fall Time Matching....................................33
Figure 14. Differential Measurement Points for Duty Cycle and Period .................................................34
Figure 15. Differential Measurement Points for Rise and Fall Time .......................................................34
Figure 16. Differential Measurement Points for Ringback ......................................................................34
Figure 17. Reference Clock System Measurement Point and Loading....................................................35
Figure 18. Auxiliary Signal Timing..........................................................................................................35
Integrated Gigabit Ethernet Controller for PCI Express vi Track ID: JATR-1076-21 Rev. 1.1
RTL8111C-GR
Datasheet
1. General Description
The Realtek RTL8111C-GR Gigabit 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
RTL8111C-GR offers high-speed transmission over CAT 5 UTP cable or CAT 3 UTP (10Mbps only)
cable. Functions such as Crossover Detection & 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 RTL8111C-GR is compliant with the IEEE 802.3u specification for 10/100Mbps Ethernet and the
IEEE 802.3ab specification for 1000Mbps Ethernet. It also supports an auxiliary power auto-detect
function, and will auto-configure related bits of the PCI power management registers in PCI configuration
space.
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 RTL8111C-GR.
The RTL8111C-GR 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 RTL8111C-GR 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 also 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 device
embeds an adaptive equalizer in the PCIe PHY for ease of system integration and excellent link quality.
The equalizer enables the length of the PCB traces to reach 40 inches.
The RTL8111C-GR is suitable for multiple market segments and emerging applications, such as desktop,
mobile, workstation, server, communications platforms, and embedded applications.
The signal type codes below are used in the following tables:
I: Input S/T/S: Sustained Tri-State
O: Output O/D: Open Drain
T/S: Tri-State bi-directional input/output pin
5.1. Power Management/Isolation
Table 1. Power Management/Isolation
Symbol Type Pin No Description
LANWAKEB O/D 19
ISOLATEB I 36
Power Management Event: Open drain, active low.
Used to reactivate the PCI Express slot’s main power rails and reference clocks.
Isolate Pin: Active low.
Used to isolate the RTL8111C-GR from the PCI Express bus. The RTL8111C-GR
will not drive its PCI Express outputs (excluding LANWAKEB) and will not
sample its PCI Express input as long as the Isolate pin is asserted.
RTL8111C-GR
Datasheet
5.2. PCI Express Interface
Table 2. PCI Express Interface
Symbol Type Pin No Description
REFCLK_P I 26
REFCLK_N I 27
HSOP O 29
HSON O 30
HSIP I 23
HSIN I 24
PCI Express Reset Signal: Active low.
When the PERSTB is asserted at power-on state, the RTL8111C-GR returns
to a pre-defined reset state and is ready for initialization and configuration
after the de-assertion of the PERSTB.
Reference clock request signal. This signal is used by the RTL8111C-GR to
request starting of the PCI Express reference clock.
EEDI: Output to serial data input pin of EEPROM.
AUX: Input pin to detect if Aux. Power exists or not on initial power-on.
EEDI/AUX O/I 47
EEDO I 45 Input from serial data output pin of EEPROM.
EECS O 44 EECS: EEPROM chip select.
This pin should be connected to EEPROM. To support wakeup from ACPI
D3cold or APM power-down, this pin must be pulled high to Aux. Power
via a resistor. If this pin is not pulled high to Aux. Power, the
RTL8111C-GR assumes that no Aux. Power exists.
In MDI mode, this is the first pair in 1000Base-T, i.e. the BI_DA+/- pair, and is
the transmit pair in 10Base-T and 100Base-TX.
In MDI crossover mode, this pair acts as the BI_DB+/- pair, and is the receive
pair in 10Base-T and 100Base-TX.
In MDI mode, this is the second pair in 1000Base-T, i.e. the BI_DB+/- pair, and
is the transmit pair in 10Base-T and 100Base-TX.
In MDI crossover mode, this pair acts as the BI_DA+/- pair, and is the transmit
pair in 10Base-T and 100Base-TX.
In MDI mode, this is the third pair in 1000Base-T, i.e. the BI_DC+/- pair.
In MDI crossover mode, this pair acts as the BI_DD+/- pair.
In MDI mode, this is the fourth pair in 1000Base-T, i.e. the BI_DD+/- pair.
In MDI crossover mode, this pair acts as the BI_DC+/- pair.
VDD33 Power 16, 37, 46, 53 Digital 3.3V power supply.
DVDD12 Power 21, 32, 38, 43, 49, 52 Digital 1.2V power supply.
AVDD12 Power 8, 11, 14, 58 Analog 1.2V power supply.
EVDD12 Power 22, 28 Analog 1.2V power supply.
AVDD33 Power 2, 59 Analog 3.3V power supply.
EGND Power 25, 31 Analog Ground.
GND Power 65 Ground (Exposed Pad).
Note: Refer to the most updated schematic circuit for correct configuration.
5.9. GPIO
Table 9. GPIO Pins
Symbol Type Pin No Description
IGPIO I 50 Input GPIO Pin.
Output GPIO Pin. This pin reflects the link up or link down state.