博通（Broadcom）公司的BCM5761是集成了10/100/1000BASE-T吉比特以太网（GbE）媒体接入控制和物理层收发器的解决方案，用于高性能的网络应用。BCM5761把三速IEEE 802.3兼容的MAC，PCI Express总线接口，缓冲器存储器和物理层收发器组合在单个芯片上，主要用在笔记本电脑和台式电脑。本文介绍了BCM5761的主要特性和优势，方框图以及DASH系统实现方框图。

Broadcoms TruManage Technology Enables New Enterprise-Class PCs with Energy-Efficient, Cost Effective Client Manageability
--Dell and HP Deploy Systems Utilizing the Broadcom® NetXtreme BCM5761 Gigabit Ethernet Controller Featuring Standards-Based Remote Manageability

The BCM5761 is a fully integrated 10/100/1000BASE-T Gigabit Ethernet (GbE) media access control and physical layer transceiver solution for high-performance network applications. The BCM5761 combines a triple-speed, IEEE 802.3 compliant media access controller (MAC), PCI Express bus interface, on-chip buffer memory, and integrated physical layer transceiver in a single device. The BCM5761 is fabricated in a low-voltage silicon process, providing an ultralow power solution. By itself, the BCM5761 provides a complete single-chip GbE NIC or LOM solution. The BCM5761 includes a 10/100/1000-Mbps Ethernet MAC with full-duplex and half-duplex capability at all speeds. Support for the following 802.3 functions is featured in the MAC—VLAN tagging, Layer 2 priority encoding, and full-duplex flow control. The BCM5761 controller offers IPsec task offload capabilities compliant with Microsoft v2 logo requirements, which enables IT professionals to deploy IPsec technology on their existing network with no performance penalty and while maintaining low CPU utilization and high network capacity by offloading all the cryptographic processing to the hardware. With in-line offload architecture, the BCM5761 controller enables network security at an extremely low cost. With network topologies becoming more complex with increased mobility and remote workers, security threats are now more sophisticated with viruses and worms. IPsec protocols operate at the network layer and enable end-to-end authentication and encryption between clients and servers, allowing efficient network segmentation and isolation. The BCM5761 integrates an on-chip application processing engine (APE) with its runtime memory providing a complete web services-based management functionality via Broadcom’s TruManage technology. The single-chip highly integrated product offers a scalable and centralized architecture, which, combined with a highly optimized firmware and software, enables low-power, secure, fault-tolerant, and cost-effective implementation.
Target applications of the BCM5761: • Desktop and mobile PC LOM
BCM5761主要特性：

Integrated 10/100/1000BASE-T transceiver
10/100/1000BASE-T triple-speed MAC
State-of-the- art physical layer interface that exceeds IEEE requirements
On-chip voltage regulation
PCI Express host interface•x1 PCIe v1.1
Active State Power Management (ASPM) capability
Message Signal Interrupt (MSI)
Intelligent power management
Centralized power management enables easy and efficient control of different power modes
Innovative implementation that optimizes power consumption dynamically and transparently, depending on network and system states
Policy-based implementation allows easy system integration and enables OEMs to differentiate
Performance features
TCP, IP, and UDP checksum
Receive Side Scaling (RSS) for multicore client processors
Microsoft Large Send Offload (LSO) and Giant Send Offload (GSO)
Interrupt coalescing
IPsec Task Offload
Compliant with Microsoft v2 logo requirements
NDIS 6.0 support with Authentication and Authentication+Encryption•AES-GMAC, AES-GCM, and ICV crypto algorithms support
Industry-compliant web services-based manageability
Out-of-band manageability through Broadcom® TruManagetechnology
Desktop and Mobile Architecture for System Hardware (DASH) specification v1.0 and v1.1
Platform Management Component Intercommunication (PMCI) specification
Robust ACPI-compliant Wake-on-LAN (WoL)
Alert Standard Format (ASF) 2.0 support

BCM5761优势：
Support
Single-chip device for LAN-on-Motherboard (LOM) and network interface card (NIC) applications•Proven technology built on ten generations of controller products•Wirespeed performance increases user performance
PCI Express provides wirespeed non-blocking throughput
TCP/IP offloads significantly reduce utilization of CPU and increases network throughput for large files download
Advance security with no performance penalty
Full offload of all IPsec packet processing with on-chip cryptographic engines supporting the latest industry algorithms•Enables corporate customers to take full advantage of Microsoft Server and Domain isolation technology
Web services-based remote manageability reduces IT costs
Secure platform manageability with both user/machine authentication and encryption capabilities
Remote monitoring and control of desktop and mobile PCs in a corporate network
Remote configuration and installation
Remote diagnostic and repair of PC platforms regardless of their state
Scalable solution that is agnostic to the platform vendors and architecture
Extremely low power consumption enables environment-friendly designs
Increases battery life in mobile applications and saves energy in desktop implementations
Enables full web services-based manageability while maintaining Energy Star compliance



图1。BCM5761 方框图



图2。DASH系统实现方框图