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MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
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Twisted Pair Interface
MC68835
for FDDI Local Area Networks
Overview The FDDI is a LAN standard under ANSI auspices. The standard supports a 100 Mbps fiber–optic–based token ring with up to 1000 stations; total ring length should not exceed 200 Km with up to 2 km between stations. FDDI over twisted–pair cable is also supported by the TP–PMD standard. The twisted pair cable connecting two stations can be up to 100 meters in length. Users are encouraged to refer to the pertinent ANSI standard documents for further information. Introduction FA SUFFIX The MC68835 Twisted–Pair Interface chip (TPIC) is a transceiver TQFP PACKAGE capable of transmitting and receiving MLT3 or NRZI encoded data CASE 931–02 streams, as well as handling clock and data recovery. The TPIC implements the lower portion of the Physical layer (PHY) functions of the FDDI standard. It performs a five–bit parallel to serial conversion during transmission, as well as a five–bit serial to parallel conversion during reception. The TPIC uses the five–bit parallel interface to communicate with the MC68837 Elastic Buffer and Link Manager (ELM) device or other Motorola FDDI devices that incorporate the ELM function internally, such as the 68840 IFDDI, 68848 CAMEL, or the 68847 Quad ELM. MC68835 Features
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Supports Twisted Pair and Fiber Optic Media Supports MLT–3 Line Code in Twisted Pair Mode Supports NRZI Line Code in Fiber Mode Adaptive Receive Equalization supports TP line lengths of 0 to 100 meters Controlled Twisted Pair Output Transition Times May Eliminate Need for Transmit Filter TP Receiver Includes Circuitry Which Enables Error Free Reception of Data Distorted with Base Line Wander Twisted Pair and Fiber Transmitters Share Same IC pins. Twisted Pair and Fiber Receivers also Share Same IC Pins Twisted Pair or Fiber Optic Operation S...
MC68835 PDF File
