以太网芯片 RTL8125BG-CG

RTL8125B-CG/RTL8125BS-CG热点为：PXE免驱，适用于多个细分市场和新兴应用，如桌面、移动、工作站、服务器、通信平台和嵌入式应用程序。 PCI Express是一种高带宽、低针数、串行、互连技术，在性能上优于传统的PCI，并保持与现有PCI基础设施的软件兼容性。

技术方面：

1.RTL8125B/RTL8125BS通过5e类UTP电缆或3类电缆提供高速传输UTP（仅限10Mbps）电缆。支持交叉检测和自动校正，极性校正，自适应均衡、串扰消除、回声消除、定时恢复和纠错 实现以在高速下提供稳健的传输和接收能力。

2.RTL8125BS提供内置开关调节器。 3.RTL8125B/RTL8125S支持PCI Express 2.1总线接口，用于与电源管理，并符合10/100Mbps以太网的IEEE 802.3u规范，IEEE 1000Mbps以太网的802.3ab规范和2500Mbps以太网的IEEE 802.3bz规范。

3.1它支持辅助电源自动检测功能，并将自动配置PCI电源的相关位PCI配置空间中的管理寄存器。高级配置电源管理接口（ACPI）-现代操作电源管理，

3.2支持能够操作系统定向电源管理（OSPM）的系统，实现最有效的电源管理。

3.3支持PCI MSI（消息信号中断）和MSI-X

3.4除了ACPI功能外，支持远程唤醒（包括AMD Magic Packet和Microsoft唤醒Frame）在ACPI和APM（高级电源管理）环境中。3.5支持从深度断电状态（如D3cold，即主电源关闭且仅存在辅助电源）开始辅助电源必须能够为RTL8125B/RTL8125B提供所需的电源。

3.6为了进一步降低功耗，RTL8125B/RTL8125BS还支持PCIe L1子状态L1.1和L1.2。

部分原理图：

RTL8125BS+5GYT003+RJ45

RTL8125BG+5GYT003+RJ45

RTL8111K+5GYT003+RJ45

RTL8125BG(S)-CG

INTEGRATED 10/100/1000M/2.5G ETHERNET CONTROLLER FOR PCI EXPRESS APPLICATIONS (SUPPORTS REALTEK DRAGON SW FOR BANDWIDTH CONTROL)

General Description

The Realtek RTL8125BG/RTL8125BGS 10/100/1000M/2.5G Ethernet controller combines a four-speed IEEE 802.3 compatible Media Access Controller (MAC) with a four-speed Ethernet transceiver, PCI Express bus controller, and embedded memory. With state-of-the-art DSP technology and mixed-mode signal technology, the RTL8125BG/RTL8125BGS offers high-speed transmission over CAT 5e 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 RTL8125BGS provides a built-in switching regulator. 

The RTL8125BG/RTL8125BGS supports the PCI Express 2.1 bus interface for host communications with power management, and is compatible with the IEEE 802.3u specification for 10/100Mbps Ethernet, the IEEE 802.3ab specification for 1000Mbps Ethernet and the IEEE 802.3bz specification for 2500Mbps 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. 

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 RTL8125BG/RTL8125BGS. To further reduce power consumption, the RTL8125BG/RTL8125BGS also supports PCIe L1 substate L1.1 and L1.2. 

The RTL8125BG/RTL8125BGS 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. 

The RTL8125BG/RTL8125BGS 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 RTL8125BG/RTL8125BGS can offload ARP (IPv4) and NS (IPv6) protocols while in the D3 power saving state. 

The RTL8125BG/RTL8125BGS 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 RTL8125BG/RTL8125BGS supports IEEE 1588, IEEE 1588-2008, and IEEE 802.1AS, also known as Precision Time Protocol (PTP). IEEE 802.1AS is part of the Ethernet AVB (Audio Video Bridging) standard. PTP provides micro-second level accuracy time synchronization among multiple Ethernet devices. The RTL8125BG/RTL8125BGS implements hardware support for these standards. The RTL8125BG/RTL8125BGS supports IEEE 802.1Qav, also part of the Ethernet AVB standard. IEEE 802.1Qav is a forwarding and queuing mechanism enhancement. It provides guarantees for time-sensitive (i.e., bounded latency and delivery variation), loss-sensitive real-time audio video (AV) data traffic transmissions. 

The RTL8125BG/RTL8125BGS 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 RTL8125BG/RTL8125BGS is compatible with Microsoft NDIS5, NDIS6 (IPv4, IPv6, TCP, UDP) Checksum and Segmentation Task-offload (Large send and Giant send) features, and supports IEEE 802.1P Layer 2 priority encoding and IEEE 802.1Q Virtual bridged Local Area Network (VLAN) and IEEE 802.1ad Double VLAN. The above features contribute to lowering CPU utilization, especially benefiting performance when in operation on a network server. 

The RTL8125BG/RTL8125BGS 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 maximum supported jumbo frame length of the RTL8125BG/RTL8125BGS is 16384 bytes

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 RTL8125BG/RTL8125BGS is suitable for multiple market segments and emerging applications, such as desktop, mobile, workstation, server, communications platforms, and embedded applications. 

Features

Hardware

Integrated 10M BASE-Te and 100/1000M/2.5G BASE-T 802.3 compatible transceiver

Supports 2.5G Lite (1G data rate) mode

Auto-Negotiation with Extended Next Page capability (XNP)

Compatible with NBASE-TTM Alliance PHY Specification

Supports PCI Express 2.1

Supports pair swap/polarity/skew correction

Configurable MDI port ordering (MDI swap) for easy PCB layout

Crossover Detection & Auto-Correction

Supports 1-Lane 2.5/5Gbps PCI Express Bus

Embedded OTP memory can replace external EEPROM

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 Crystal / External Oscillator

Built-in switching regulator (RTL8125BGS only)

Generate reference clock from Crystal

Supports power down/link down power saving/PHY disable mode

LAN disable with GPIO pin

Customized LEDs

Controllable LED Blinking Frequency and Duty Cycle

Self-Loopback diagnostic capability

Thermal management

48-pin QFN ‘Green’ package

Serial EEPROM

Supports 32Mbytes External Serial Peripheral Interface (SPI) Flash

Supports ECMA-393 ProxZzzy Standard for sleeping hosts

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 substate L1.1and L1.2

IEEE 

Compatible with IEEE 802.3, IEEE 802.3u, IEEE 802.3ab

Supports IEEE 1588v1, IEEE 1588v2, IEEE 802.1AS time synchronization

Supports IEEE 802.1Qav credit-based shaper algorithm

Supports IEEE 802.1P Layer 2 Priority Encoding

Supports IEEE 802.1Q VLAN tagging

Supports IEEE 802.1ad Double VLAN

Supports IEEE 802.3az (Energy Efficient Ethernet)

Supports IEEE 802.3bz (2.5GBase-T)

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 16K bytes

Supports quad core Receive-Side Scaling (RSS)

Supports Protocol Offload (ARP & NS)

Realtek Dragon Software

Smart Auto Adjust Bandwidth Control

Visual User Friendly UI

Visual Network Usage Statistics

Optimized Default Setting for Game, Browser, and Streaming Modes

User Customized Priority Control

RTL8192ES-CG，RTL8196E-CG，ALC5640-VB-CG

RTL8211DN-VB-GR

RTL8211E-VB-CG

RTL8211FI-CG

RTL8306E-CG

RTL8309M-CG

RTL8305NB-CG

RTL8812CU-CG

RTL8213B-CG

RTL8309N-VB-CG

RTL8152B-VB-CG

RTL8153-VC-CG

RTL8188EUS-VH-CG

RTL8189ES-VB-CG

RTL8192ER-CG

RTL8192EU-VP-CG

RTL8192FR-CG

RTL8197FH-VG4-CG

RTL8197FH-VG4-CG

RTL8211F-CG

RTL8211FS-CG

RTL8218B-VC-CG

RTL8218D-CG

RTL8305NB-VB-CG

RTL8309M-VB-CG

RTL8309N-CG

RTL8367N-VB-CG

RTL8367RB-VB-CG

RTL8370N-VB-CG

RTL8370MB-CG

RTL8811CU-CG

RTL8812FR-CG

RTL8822BU-CG

RTL8197FS-VE5-CG

RTL8821CU-CG

RTL8811AU-CG

RTL8019AS-LFR

RTL8382L-VB-CG

RTL8731BU-CG

RTL8811AU-CG

RTL8811CU-CG

RTL8812BU-CG

ALC256M-CG

RTL8211FD-CG

ALC4050-VA1-CG

RTS5420-GR

RTL8211DN-VB-GR

RTL8363SC-VB-CG

ALC269Q-VC3-GR

RTL8723DU-CG

RTL8111E-VC-CG

ALC4050H-VA1-CG

RTL8213B-CG

RTD2168-CG

RTL8111HS-CG

RTL8201F-VB-CG

RTL8192FR-CG

RTL8197FH-VG4-CG

RTL8305SC-LF

RTS5411S-GR

RTL8370MBI-CG

RTL8821CU-CG

RTL8105E-VL-CG

RTL8106E-CG

RTL8218D-CG

ALC283-CG

ALC892-CG