DP83901A Datasheet | National Semiconductor

Description The DP83901A Serial Network Interface Controller (SNIC) is a micro CMOS VLSI device designed for easy implementation of CSMA CD local area networks These include Ethernet (10BASE5) Thin Ethernet (10BASE2) and Twisted-pair Ethernet (10BASE-T) The overall SNIC solution provides the Media Access Control (MAC) and Encode-Decode (ENDEC) functions in accordance with the IEEE 802 3 standard The integrated ENDEC module allows Manchester encoding and decoding via a differential transceiver and phase lock loop at 10 Mbit sec Also included is a collision detect translator and diagnostic loopback capability (Continued) Features Y Y Y Y Y Y Y Y Y Y Y Y Y patible with IEEE 802 3 10BASE5 10BASE2 10BASE-T Dual 16-byte DMA channels 16-byte internal FIFO Network statistics storage Supports physical multicast and broadcast address filtering 10 Mbit sec Manchester encoding and decoding plus clock recovery No external precision ponents required Efficient buffer management implementation Transmitter can be selected for half or full step mode Integrated squelch on receive and collision pairs 3 levels of loopback supported Utilizes independent system and network clocks Lock Time 5 bits typical Decodes Manchester data with up to g 18 ns jitter 1 0 System Diagram ww.. TL F 10469 - 1 TRI-STATE is a registered trademark of National Semiconductor Corporation C1995 National Semiconductor Corporation TL F 10469 RRD-B30M115 Printed in U S A .. . .. 4U. Data Sheet 4 U . .. .. General Description (Continued) The MAC function (NIC) provides simple and efficient packet transmission and reception control by means of unique dual DMA channels and an internal FIFO Bus arbitration and memory control logic are integrated to reduce board cost and area overheads SNIC used in conjunction with the DP8392 Coaxial Transceiver Interface (CTI) provides a prehensive 2 chip solution for IEEE 802 3 networks and is designed for easy interface to the latest 10BASE-T transceivers Due to the...