Intel 21143 manual Network Connection, 10BASE-T Twisted-Pair Network Port

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

3.0Network Connection

The network connections of the 21143 can be used in 10BASE-T, AUI, MII, or SYM configurations. Different methods are used to connect each port to the actual cable connector.

3.110BASE-T Twisted-Pair Network Port

Figure 3, Figure 4, and Figure 5 show the network connection design options for 10BASE-T type implementations.

Figure 3 and Figure 4 show two ways of connecting the 10BASE-T network by using a standard 1:1 transformer module. This implementation type requires a swing compensator (to swing the 21143 output from 3.3 V to 5 V) to meet the standard requirements.

Figure 5 shows a direct connection to a 1:2 transformer module. This implementation type provides the lowest component count for 10BASE-T. The filter and transformer components minimize any potential electromagnetic interference and radio frequency interface problems.

Common-mode noise (when noise between two lines of the same polarity add rather than cancel) can radiate energy from the twisted-pair interface. Also, significant common-mode power supply noise can be generated on the board or adapter by other devices. Therefore, Intel recommends the use of filter and transformer modules that incorporate common-mode chokes.

Table 8 and Table 10 list the part numbers for each implementation. Figure 3 shows the 10BASE-T network connection with buffers. The required components for this configuration are as follows:

•Voltage swing compensator — 74ACT244

•Terminating and decoupling components

•Filter transformer and common-mode chokes

•RJ45 connector

Design Guide

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Contents Design Guide Intel 21143 PCI/CardBus 10/ 100Mb/s Ethernet LAN ControllerDesign Guide Contents Revision History TablesDate Revision Description 001 First releaseFunctional Overview Signal gep0/auibnc Description21143 Overview Network InterfaceSYM-Based PHY Block Diagram MII-Based PHY Block DiagramTwisted-Pair Signals AUI SignalsSignal Pin Number 21143 PortsSYM Signals MII Signals10BASE-T Twisted-Pair Network Port Network ConnectionBASE-T Network Connection with Buffers BASE-T Network Connection Without Buffers Minimum Components Required for 10BASE-T Ready DesignsInternal vs. External Design Features Description of 100-Ready Daughtercard Block DiagramDesign Features Internal Optional Daughtercard3 100-Ready External Module Design Description of 100-Ready External Module Block Diagram5 MII/SYM Pin Listing MII/SYM Pinout Sheet 1MII/SYM Pinout Sheet 2 AUI Network PortAUI 10BASE5 Network and Pin Connections AUI 10BASE2 Network Connection Media-Specific Components Access Type Components Available Part NumbersBASE-T Media-Specific Components BASE2 and 10BASE5 Media-Specific Components21143 Requirements Pin Requirements When Not Using the Jtag PortUnused Jtag Port Requirements Current Reference and Capacitor Input RequirementsCrystal Specifications Specification Value UnitsCrystal and Crystal Oscillator Connections Ground and Power Planes Signal Routing and Placement1 3.3 V Power Supply LED Status SignalsDesign Considerations Suggestions for Quiet Ground and Power PlanesDesigning the Ethernet Corner on Motherboards 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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