DP83905 Datasheet | National Semiconductor

Description The AT LANTIC AT Local Area Network Twisted-pair Interface Controller is a CMOS VLSI device designed for easy implementation of CSMA CD local area networks Unique to the AT LANTIC is the integration of the entire bus interface for PC-AT ISA (Industry Standard Architecture) bus based systems Hardware and software selectable options allow the AT LANTIC’s bus interface to be configured software patible to either an NE2000 or Ethercard PLUS16TM All bus drivers and control logic are integrated to reduce board cost and area Supported network interfaces include 10BASE5 or 10BASE2 Ethernet via an external transciever connected to its AUI port and Twisted-pair Ethernet (10BASE-T) using the on-board transceiver The AT LANTIC provides the Ethernet Media Access Control (MAC) Encode-Decode (ENDEC) with an AUI interface and 10BASE-T transceiver functions in accordance with the IEEE 802 3 standards The AT LANTIC’s integrated 10BASE-T transceiver fully plies with the IEEE standard This functional block incorporates the receiver transmitter collision heartbeat Ioopback jabber and link integrity blocks as defined in the standard The transceiver when bined with equalization resistors transmit receive filters and pulse transformers provides a plete physical interface from the AT LANTIC Controller’s ENDEC module and the twisted pair medium (Continued) Features Controller and integrated bus interface solution for IEEE 802 3 10BASE5 10BASE2 and 10BASE-T Y Software patible with Novell ’s NE2000 Plus industry standard Ethernet Adapters Y Selectable buffer memory size Y No external bus logic or drivers Y Integrated controller ENDEC and transceiver Y Full IEEE 802 3 AUI interface Y Single 5V supply 10BASE-T TRANSCEIVER MODULE Y Integrates transceiver functionality Transmitter and receiver functions Collision detect heartbeat and jabber Selectable link integrity test or link disable Polarity Detection Correction ENDEC MODULE Y 10 Mbit s Manchester encoding decoding Y Squelch on...