NS32491 - Serial Network Interface

National

NS32491 Datasheet Preview — Preview of NS32491 PDF

Datasheet Details

Part number	NS32491
Manufacturer	National
File Size	175.50 KB
Description	Serial Network Interface
Datasheet	NS32491_NationalSemiconductor.pdf

NS32491 Product details

Description

The DP8391 Serial Network Interface (SNI) provides the Manchester data encoding and decoding functions for IEEE 802 3 Ethernet Cheapernet type local area networks The SNI interfaces the DP8390 Network Interface Controller (NIC) to the Ethernet transceiver cable When transmitting the SNI converts non-return-to-zero (NRZ) data from the controller and clock pulses into Manchester encoding and sends the converted data differentially to the transceiver The opposite process occurs on the receive path

Features

Y Y Y Y Y Y Y Y Y Y Compatible with Ethernet II IEEE 802 3 10base5 and 10base2 (Cheapernet) 10 Mb s Manchester encoding decoding with receive clock recovery Patented digital phase locked loop (DPLL) decoder requires no precision external components Decodes Manchester data with up to g 20 ns of jitter Loopback capability for diagnostics Externally selectable half or full step modes of operation at transmit output Squelch circuits at the receive and collision inputs reject noise High voltage.

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Published: May 9, 2005 |