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Topic       : Chips 'n Chips
Author      : Michael Ruge
Version     : chips_x.hyp (01/05/2001)
Subject     : Dokumentation/Hardware
Nodes       : 1505
Index Size  : 35662
HCP-Version : 3
Compiled on : Atari
@charset    : atarist
@lang       : 
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@options    : -i -s +zz -t4
@width      : 75
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   Die Pinbelegung des National Semiconductor DP8392CN
 

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   General Description
   The DP8392C Coaxial Transceiver Interface (CTI) is a coaxial cable
   line driver/receiver for Ethernet/Thin Ethernet (Cheapernet) type
   local area networks. The CTI is connected between the coaxial cable
   and the Data Terminal Equipment (DTE). In Ethernet applications the
   transceiver is usually mounted within a dedicated enclosure and is
   connected to the DTE via a transceiver cable. In Cheapernet appli-
   cations, the CTI is typically located within the DTE and connects to
   the DTE through isolation transformers only. The CTI consists of a 
   Receiver, Transmitter, Collision Detector, and a Jabber Timer. The
   Transmitter connects directly to a 50 ohm coaxial cable where it is
   used to drive the coax when transmitting. During transmission, a 
   jabber timer is initiated to disable the CTI transmitter in the 
   event of a longer than legal leng the data packet. Collision Detec-
   tion circuitry monitors the signals on the coax to determine the 
   presence of colliding packets and signals the DTE in the event of a
   collision.
   The CTI is part of a three chip set that implements the complete 
   IEEE 802.3 compatible network node electronics as shown below. The
   other two chips are the DP8391 Serial Network Interface (SNI) and
   the DP8390 Network Interface Controller (NIC). The SNI provides the
   Manchester encoding and decoding functions; whereas the NIC handles
   the Media Access Protocol and the buffer management tasks. Isolation
   between the CTI and the SNI is an IEEE 802.3 requirement that can be
   easily satisfied on signal lines using a set of pulse transformers
   that come in a standard DIP. However, the power isolation for the 
   CTI is done by DC-to-DC conversion through a power transformer.
 
 
 
 






















     Kapitel Die Pinbelegung des National Semiconductor DP8392CN, Seite 1