dp83901a National Semiconductor Corporation, dp83901a Datasheet
dp83901a
Manufacturer Part Number
dp83901a
Description
Serial Network Interface Controller
Manufacturer
National Semiconductor Corporation
Datasheet
1.DP83901A.pdf
(62 pages)
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C 1995 National Semiconductor Corporation
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
1 0 System Diagram
TRI-STATE is a registered trademark of National Semiconductor Corporation
TL F 10469
(Continued)
Features
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Compatible with IEEE 802 3
10BASE-T
Dual 16-byte DMA channels
16-byte internal FIFO
Network statistics storage
Supports physical multicast and broadcast address
filtering
10 Mbit sec Manchester encoding and decoding plus
clock recovery
No external precision components required
Efficient buffer management implementation
Transmitter can be selected for half or full step mode
Integrated squelch on receive and collision pairs
3 levels of loopback supported
Utilizes independent system and network clocks
Lock Time 5 bits typical
Decodes Manchester data with up to
10BASE5
RRD-B30M115 Printed in U S A
g
18 ns jitter
November 1995
TL F 10469 – 1
10BASE2
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