The DP83901A SNIC Serial Network Interface Controller is a network controller produced by National Semiconductor. The controller supports the IEEE 802.3 standard and can realize a 10Mbit/s network connection.
The document describes the DP83901A Serial Network Interface Controller (SNIC), a microCMOS VLSI device designed for easy implementation of CSMA/CD local area networks. It provides Media Access Control (MAC) and Encode-Decode (ENDEC) functions in accordance with the IEEE 802.3 standard, supporting Ethernet variants including 10BASE5, 10BASE2, and 10BASE-T.
The device is designed for use with Ethernet (10BASE5), Thin Ethernet (10BASE2), and Twisted-pair Ethernet (10BASE-T).
The integrated ENDEC module handles Manchester encoding and decoding at 10 Mbit/sec.
Four clock cycles are used per DMA cycle.