DP83902AVLJ

Series:	--
Packaging:	Tray
Part Status:	Obsolete
Protocol:	--
Function:	Controller
Interface:	--
Standards:	--
Voltage - Supply:	4.75 V ~ 5.25 V
Current - Supply:	140mA
Operating Temperature:	0°C ~ 70°C
Package / Case:	100-BQFP
Supplier Device Package:	100-QFP (20x14)
Base Part Number:	DP83902

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The DP83902AVLJ (shown in Figure 1) is a chip manufactured by National Semiconductor that serves as an interface controller. It is commonly used in applications such as microprocessors, data handling, high-speed networking, and communications systems. In this article, we will delve into the DP83902AVLJ\'s application field and working principle to better understand its purpose and how it functions.The DP83902AVLJ is designed for the implementation of Local Area Network (LAN) protocols. It is suitable for high-speed networks that transfer large amounts of data, such as Fast Ethernet and Gigabit Ethernet. Its purpose is to provide the interface between the host processor and the physical medium. It allows for the manipulation and translation of packets, as well as the transmission of data over the network.The DP83902AVLJ also supports higher-level protocols such as IP, ICMP, TCP, and UDP. It also handles addressing, routing, and address resolution. It can be used to build bridges and routers, providing packet forwarding and traffic prioritization. It is also suitable for use in data communication systems, supporting protocols such as V.35, X.21, RS-232, and RS-449.The DP83902AVLJ consists of two main parts: the controller and the physical interface. The controller part of the chip is responsible for the protocol-level functions, such as packet handling and address resolution. It is also responsible for configuring the physical interface and the link protocol.The physical interface consists of a MAC layer and a PHY layer. The MAC layer is responsible for media access control and is used for interfacing with the physical layer devices. It also supports link management and network control. The PHY layer is responsible for the actual physical connection with the network medium. It supports various transmission modes such as 10Base-T, 100Base-T, and 1000Base-T.To process data, the DP83902AVLJ uses an architecture that consists of several separate modules. These modules are connected by an internal bus. The modules include a MAC interface, a MAC controller, a bus interface, a Trasmit FIFO, and a Receive FIFO. The MAC interface receives data from the host processor and sends it to the controller for processing. The MAC controller then processes the data according to the protocol specified by the host processor.Once the data is ready for transmission, it is sent to the Transmit FIFO. The FIFO stores the data until the PHY layer is ready to transmit the data over the network. The process is reversed for data received from the network – the data is placed in the Receive FIFO, and then sent to the MAC interface for further processing by the host processor.The DP83902AVLJ is a chip designed by National Semiconductor that serves as an interface controller. It is used in high-speed networks that transfer large amounts of data, such as Fast Ethernet and Gigabit Ethernet. It is also suitable for use in data communication systems, supporting protocols such as V.35, X.21, RS-232, and RS-449. The DP83902AVLJ consists of two main parts: the controller and the physical interface. The controller part of the chip is responsible for the protocol-level functions, while the physical interface consists of a MAC layer and a PHY layer. The DP83902AVLJ is a powerful and versatile interface controller that provides the interface between the host processor and the physical medium.

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