DP83901A Datasheet, PDF (1/62 Pages) National Semiconductor (TI) – Serial Network Interface Controller

November 1995
DP83901A SNIC
Serial Network Interface Controller
General Description
The DP83901A Serial Network Interface Controller (SNIC) is
a microCMOS VLSI device designed for easy implementa-
tion of CSMA CD local area networks These include Ether-
net (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 stan-
dard
The integrated ENDEC module allows Manchester encod-
ing 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 _{Compatible with IEEE 802 3 10BASE5 10BASE2}
10BASE-T
Y _{Dual 16-byte DMA channels}
Y _{16-byte internal FIFO}
Y _{Network statistics storage}
Y _{Supports physical multicast and broadcast address}
filtering
Y _{10 Mbit sec Manchester encoding and decoding plus}
clock recovery
Y _{No external precision components required}
Y _{Efficient buffer management implementation}
Y _{Transmitter can be selected for half or full step mode}
Y _{Integrated squelch on receive and collision pairs}
Y _{3 levels of loopback supported}
Y _{Utilizes independent system and network clocks}
Y _{Lock Time 5 bits typical}
Y _{Decodes Manchester data with up to} g_{18 ns jitter}
1 0 System Diagram
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