Description
The Ethernet controller is also known as the Ethernet adapter, that is, we usually call the "network card", the installation method is inserted in the PCI expansion slot of the machine motherboard, generally white, and then install the driver CD attached to the purchased network card. Ethernet controllers use a specific physical layer and data link layer standard, such as Ethernet or token ring, to implement the circuit system required for communication. This provides the basis for a complete network protocol stack, enabling communication between small groups of computers on the same local area network and wide area networks connected by routing protocols, such as IP. An Ethernet controller is usually equipped with a twisted pair, fiber, BNC, AUI, HomePNA interface, of which the latter three are less common today, fiber is more used for servers. The ENC28J60 is a stand-alone Ethernet controller with a peripheral interface that can be used as an Ethernet interface for any controller equipped with an SPI interface. ENC28J60 complies with all IEEE 802.3 specifications and uses a series of packet filtering mechanisms to restrict incoming data. It also provides an internal DMA module for fast data throughput and hardware-supported IP checksum calculations. Communication between the ENC28J60 and the host controller is achieved through two interrupt pins and the SPI interface, and the data transfer rate is up to 10Mbps. Two dedicated pins are used to connect leds for network activity status indication.
Main characteristics (1) IEEE 802.3-compatible Ethernet controller; (2) Integrated MAC and 10 BASE-T PHY; (3) Support a 10BASE-T port with automatic polarity detection and correction; (4) Support full duplex and half duplex mode; (5) Programmable automatic retransmission in case of conflict; (6) Programmable filling and CRC generation; (7) Programmable automatic rejection of error packets; (8) SPI interface with maximum speed up to 10Mbps; (9) Has two programmable LED output pins for connection, transmit, receive, conflict and full/half duplex status; (10) Seven interrupt sources using two interrupt pins; (11) Clock output pin with programmable pre-divider; (12) The working voltage range is 3.14~3.45V; (13) Compatible with TTL level input; (14) Temperature range: -40~+85℃ (industrial grade), 0~+70℃ (commercial grade) (SSOP package only); (15) 28-pin SPDIP, SSOP, SOIC and QFN packages. component (1) SPI interface, which acts as a communication channel between the master controller and ENC28J60; (2) Control register for controlling and monitoring ENC28J60; (3) Dual-port RAM buffer for receiving and sending data packets; (4) Arbiter, which controls access to RAM buffer when DMA, transmit and receive modules issue requests; (5) Bus interface to analyze data and commands received through SPI; (6) Media control layer module to achieve MAC logic in line with IEEE 802.3 standard; (7) Physical layer module, encoding and decoding the analog data on the twisted pair.
The DM9000A chip is a fully integrated universal processor interface and low cost single chip fast Ethernet MAC (Media Access Layer) controller with a 10/100M adaptive PHY (physical layer) and 16KB SRAM, supporting 8-bit and 16-bit interfaces to access internal memory to support different processors. The DM9000A also provides a media independent interface (MII) to connect to all home phone line network devices or other transceivers that provide support for a media independent interface.
Main function
(1) Support the processor to read and write the internal memory of the data operation command, in byte/word/double word length;
(2) Integrated 10/100M automatic polarity conversion transceiver;
(3) Support medium independent interface;
(4) Support 100M optical fiber interface;
(5) Support backpressure mode when half duplex flow control;
(6) Full duplex mode of IEEE 802.3x flow control;
(7) Support wake up frame, link state change and remote wake up;
(8) Support IP/TCP/UDP checksum generation and check;
(9) Compatible with 3.5V and 5.0V input and output voltages.
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