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DP83901AV
SNIC Serial Network Interface Controller
TL/F/10469
DP83901A
SNIC
Serial
Network
Interface
Controller
November 1995
DP83901A SNIC
Serial Network Interface Controller
General Description
The DP83901ASerial NetworkInterface Controller (SNIC)is microCMOS VLSI device designedfor easy implementa-
tionof CSMA/CD local area networks. These includeEther-
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) functionsin accordancewiththe IEEE 802.3 stan-
dard.
The integrated ENDEC module allows Manchester encod-
ing and decodingviaa differential transceiver and phase
lock loopat10 Mbit/sec. Also includedisa collision detect
translatorand diagnostic loopback capability. (Continued)
Features Compatible with IEEE 802.3, 10BASE5, 10BASE2,
10BASE-T Dual 16-byte DMA channels 16-byte internal FIFO Network statistics storage Supports physical, multicastand broadcast address
filtering10 Mbit/sec Manchester encoding and decoding plus
clock recoveryNo external precision components required Efficient buffer management implementation Transmittercanbe selectedforhalforfull step mode Integrated squelchon receiveand collision pairs3 levelsof loopback supported Utilizes independent system and network clocks Lock Time5bits typical Decodes Manchester data withupto g18ns jitter
1.0 System Diagram
TL/F/10469–1
TRI-STATEÉ isaregistered trademarkof National SemiconductorCorporation.
C1995National SemiconductorCorporation RRD-B30M115/PrintedinU.S.A.
