RTL8101E-GR Realtek Microelectronics, RTL8101E-GR Datasheet - Page 12

• Manufacturer Part Number: RTL8101E-GR
• Description: Intergated Fast Ethernet Controller
• Manufacturer: Realtek Microelectronics

6.
6.1. PCI Express Bus Interface
The RTL8101E complies with PCI Express Base Specification Revision 1.0a, and runs at a 2.5GHz
signaling rate with X1 link width, i.e., one transmit and one receive differential pair. The RTL8101E
supports four types of PCI Express messages: interrupt messages, error messages, power management
messages, and hot-plug messages. To ease PCB layout constraints, PCI Express lane polarity reversal and
link reversal are also supported.
6.1.1.
The RTL8101E’s PCI Express block receives digital data from the Ethernet interface and performs data
scrambling with Linear Feedback Shift Register (LFSR) and 8B/10B coding technology into 10-bit code
groups. Data scrambling is used to reduce the possibility of electrical resonance on the link, and 8B/10B
coding technology is used to benefit embedded clocking, error detection, and DC balance by adding an
overhead to the system through the addition of 2 extra bits. The data code groups are passed through its
serializer for packet framing. The generated 2.5Gbps serial data is transmitted onto the PCB trace to its
upstream device via a differential driver.
6.1.2.
The RTL8101E’s PCI Express block receives 2.5Gbps serial data from its upstream device to generate
parallel data. The receiver’s PLL circuits are re-synchronized to maintain bit and symbol lock. Through
8B/10B decoding technology and data descrambling, the original digital data is recovered and passed to
the RTL8101E’s internal Ethernet MAC to be transmitted onto the Ethernet media.
6.2. LED Functions
The RTL8101E supports four LED signals in four different configurable operation modes. The following
sections describe the various LED actions.
6.2.1.
The Link Monitor senses link integrity, such as LINK10, LINK100, LINK10/100, LINK10/ACT, or
LINK100/ACT. Whenever link status is established, the specific link LED pin is driven low. Once a cable
is disconnected, the link LED pin is driven high, indicating that no network connection exists.
Integrated Fast Ethernet Controller for PCI Express
Functional Description
PCI Express Transmitter
PCI Express Receiver
Link Monitor
7
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RTL8101E-GR
Datasheet
Rev. 1.2
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