Intel 21143 manual MII-Based PHY Block Diagram, SYM-Based PHY Block Diagram

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Intel® 21143 PCI/CardBus 10/100Mb/s Ethernet LAN Controller

The 21143 implements the 100BASE-T MII layer and the 100/10 Mb/s Ethernet MAC layer. The 21143 provides a dual network interface for both a 100BASE-T and a 10 Mb/s Ethernet. At the 100BASE-T port, the 21143 supports the industry-standard MII for any 100BASE-T implementation.

The 21143 is fully compliant with the MII specifications (as defined in IEEE 802.3). The MII is a nibblewide, general interface, that can be used with various physical interfaces, such as 100BASE- TX, 100BASE-T4, shielded twisted-pair (STP), and fiber. It also supports dual rates of speed

(10 Mb/s and 100 Mb/s).

The 21143 includes special support for 100BASE-TX networks by including the PCS section (scrambler and 5B/4B coding/decoding). Integrating the 10BASE-T ENDEC with the 100 Mb/s- only SYM-based PHYs enables full support for a 10/100-implementation.

1.3MII-Based PHY Block Diagram

Figure 1 is a block diagram of a 10BASE-T and 100BASE-T single-connector network connection using a MII-based PHY device with the 21143.

MII-based PHY devices are provided by Intel, Integrated Circuit Systems*, National

Semiconductor*, Seeq*, and TDK*.

Figure 1. MII-Based PHY Design

MII Port

of 21143

MII-Based

PHY

Devices

Magnetics

Module

10/100 Mb/s

Network

The MII-based PHY design includes the following components:

•The MII-based PHY devices, which have a direct interface to the MII port of the 21143 with dual-rate option (as specified in the MII specification) and a full interface to the 10/100 Mb/s magnetics module.

•The magnetics module, which is based on transformers and serial chokes enabling the network connection to the 100 Mb/s network (100BASE-TX or 100BASE-T4) and to the 10 Mb/s network (10BASE-T).

1.4SYM-Based PHY Block Diagram

Figure 2 is a block diagram of a 100BASE-TX single-connector network connection using a SYM- based PHY device with the 21143. For a 10 Mb/s network connection, the network can be connected directly to the 21143 through filters and chokes.

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Design Guide

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Contents Intel 21143 PCI/CardBus 10/ 100Mb/s Ethernet LAN Controller Design GuideDesign Guide Contents Date Revision Description TablesRevision History 001 First release21143 Overview Signal gep0/auibnc DescriptionFunctional Overview Network InterfaceMII-Based PHY Block Diagram SYM-Based PHY Block DiagramSignal Pin Number AUI SignalsTwisted-Pair Signals 21143 PortsMII Signals SYM SignalsNetwork Connection 10BASE-T Twisted-Pair Network PortBASE-T Network Connection with Buffers BASE-T Network Connection Without Buffers Ready Designs Minimum Components Required for 10BASE-TDesign Features Description of 100-Ready Daughtercard Block DiagramInternal vs. External Design Features Internal Optional Daughtercard5 MII/SYM Pin Listing Description of 100-Ready External Module Block Diagram3 100-Ready External Module Design MII/SYM Pinout Sheet 1AUI Network Port MII/SYM Pinout Sheet 2AUI 10BASE5 Network and Pin Connections AUI 10BASE2 Network Connection BASE-T Media-Specific Components Access Type Components Available Part NumbersMedia-Specific Components BASE2 and 10BASE5 Media-Specific ComponentsUnused Jtag Port Requirements Pin Requirements When Not Using the Jtag Port21143 Requirements Current Reference and Capacitor Input RequirementsCrystal Specifications Specification Value UnitsCrystal and Crystal Oscillator Connections Signal Routing and Placement Ground and Power PlanesLED Status Signals 1 3.3 V Power SupplyDesigning the Ethernet Corner on Motherboards Suggestions for Quiet Ground and Power PlanesDesign Considerations Suggestions for FCC ComplianceSuggestions for Routing

21143 specifications

The Intel 21143 is a widely recognized Ethernet controller that has played a significant role in the development of networking technology throughout the late 1990s and early 2000s. This controller, part of Intel's line of networking solutions, was designed primarily for desktop and server systems, catering to the needs of both home and enterprise-level networking.

One of the main features of the Intel 21143 is its support for the IEEE 802.3 standard, allowing it to facilitate Ethernet networking at speeds of up to 100 Mbps. The 21143 supports both the 10Base-T and 100Base-TX Ethernet standards, making it versatile for different network environments. Its ability to auto-negotiate between these speeds ensures compatibility with a wide range of network devices, enhancing its utility in mixed-speed networks.

The Intel 21143 employs an advanced shared memory architecture that enables efficient data transfer and reduces CPU overhead. This feature ensures that the controller can handle higher throughput while allowing the CPU to focus on other tasks. Additionally, the controller supports a direct memory access (DMA) transmission capability, providing further enhancements in data handling and overall system performance.

An important characteristic of the Intel 21143 is its onboard processor, which allows it to offload certain networking tasks from the host CPU. This results in improved overall system performance, as the main processor is freed from handling all network traffic. The controller supports Full Duplex operation, enabling simultaneous sending and receiving of data, effectively doubling the potential bandwidth for each connection.

Another notable technology integrated into the Intel 21143 is its built-in support for TCP/IP checksum calculations. By offloading this computationally intensive task from the CPU, the controller enhances network performance, particularly in data-intensive applications such as file transfers and video streaming.

The Intel 21143 was primarily used in PCI (Peripheral Component Interconnect) applications, which facilitated ease of integration into existing systems. Its compatibility with various operating systems, including Windows and Linux, made it a popular choice among developers and users alike.

Overall, the Intel 21143 Ethernet controller has been instrumental in evolving networking technology. Its impressive features, efficient architecture, and robust performance have solidified its position in the market, paving the way for future advancements in Ethernet networking. Even today, the principles and technologies introduced with the Intel 21143 continue to influence modern networking solutions.
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