The AM79C940 is a single-chip 10BASE-T Ethernet controller manufactured by Advanced Micro Devices (AMD). This component is designed to provide a complete solution for connecting devices to an Ethernet network. It integrates all the necessary functions to transmit and receive data over a twisted-pair cable, adhering to the 10BASE-T standard.

Applications:

• Network interface cards (NICs)
• Embedded networking devices
• Industrial control systems with Ethernet connectivity
• Printers and other peripherals requiring network access
• Early Ethernet-enabled PCs and workstations

Features:

• Fully compliant with the IEEE 802.3 10BASE-T standard.
• Integrated transceiver for twisted-pair Ethernet connections.
• Supports both half-duplex and full-duplex operation.
• Built-in media access control (MAC) layer functions.
• Automatic collision detection and handling.
• DMA (Direct Memory Access) support for efficient data transfer.
• Flexible host interface (e.g., ISA bus).
• Low power consumption for energy-efficient applications.

Benefits:

• Complete Ethernet Solution: Provides all the necessary functions for connecting to a 10BASE-T network.
• Reliable Connectivity: Ensures reliable data transmission and reception over Ethernet.
• Efficient Data Transfer: DMA support allows for high-speed data transfer between the host system and the network.
• Flexible Integration: Compatible with various host interfaces, making it adaptable to different system architectures.
• Low Power Consumption: Minimizes energy usage, making it suitable for embedded and portable applications.
• Cost-Effective: Single-chip design reduces component count and overall system cost.

Technical Specifications:

The AM79C940 operates on a 5V power supply. It supports data transfer rates of up to 10 Mbps. The device features integrated collision detection and handling mechanisms. Refer to the AMD datasheet for detailed electrical characteristics, timing diagrams, and package information.