Intel 21143 Unused Jtag Port Requirements, Current Reference and Capacitor Input Requirements

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

4.021143 Requirements

This section provides information about the external component connections for the 21143, and describes the following requirements:

•Unused JTAG port requirements

•Current reference and capacitor input

•Crystal connection or crystal oscillator connection for the serial clock connection

4.1Unused JTAG Port Requirements

Table 10 describes the 21143 signal pin requirements if you are not using the JTAG port.

Table 10. Pin Requirements When Not Using the JTAG Port

Leave the Following JTAG Pins Open

Pull the Following JTAG Pin Up or Down

 

 

tms (pin 1)

tck (pin 120)

 

 

tdi (pin 2)

 

 

 

tdo (pin 4)

 

 

 

4.2Current Reference and Capacitor Input Requirements

Table 11 describes the current reference and capacitor input requirements for the 21143, and Figure 10 shows the external component connections.

Table 11. Current Reference and Capacitor Inputs

Pin Name

Pin Number

Function

 

Connect This Pin...

 

 

 

 

 

iref

108

Current reference input

for the analog

Through a 2.4 kΩ resistor to ground

phase-locked loop (PLL)

 

 

 

 

 

 

 

 

vcap_h

110

Capacitor input

 

Through a 0.022 ∝ F capacitor to ground

 

 

 

 

 

Design Guide

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Contents Design Guide Intel 21143 PCI/CardBus 10/ 100Mb/s Ethernet LAN ControllerDesign Guide Contents 001 First release TablesRevision History Date Revision DescriptionNetwork Interface Signal gep0/auibnc DescriptionFunctional Overview 21143 OverviewSYM-Based PHY Block Diagram MII-Based PHY Block Diagram21143 Ports AUI SignalsTwisted-Pair Signals Signal Pin NumberSYM 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 Optional Daughtercard Description of 100-Ready Daughtercard Block DiagramInternal vs. External Design Features Design FeaturesMII/SYM Pinout Sheet 1 Description of 100-Ready External Module Block Diagram3 100-Ready External Module Design 5 MII/SYM Pin ListingMII/SYM Pinout Sheet 2 AUI Network PortAUI 10BASE5 Network and Pin Connections AUI 10BASE2 Network Connection BASE2 and 10BASE5 Media-Specific Components Access Type Components Available Part NumbersMedia-Specific Components BASE-T Media-Specific ComponentsCurrent Reference and Capacitor Input Requirements Pin Requirements When Not Using the Jtag Port21143 Requirements Unused Jtag Port RequirementsSpecification Value Units Crystal SpecificationsCrystal and Crystal Oscillator Connections Ground and Power Planes Signal Routing and Placement1 3.3 V Power Supply LED Status SignalsSuggestions for FCC Compliance Suggestions for Quiet Ground and Power PlanesDesign Considerations Designing the Ethernet Corner on MotherboardsSuggestions 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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