NS32491 Datasheet PDF - National Serial Network Interface Specs

NS32491 - Serial Network Interface

Datasheet Summary

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

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.

Datasheet Details

Part number	NS32491
Manufacturer	National
File Size	175.50 KB
Description	Serial Network Interface
Datasheet	NS32491 Datasheet
Additional preview pages of the NS32491 datasheet.

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Full PDF Text Transcription

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DP8391 NS32491 Serial Network Interface July 1986 DP8391 NS32491 Serial Network Interface General 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 where a digital phase-locked loop decodes 10 Mbit s signals with as much as g 20 ns of jitter The DP8391 SNI is a functionally complete Manchester encoder decoder including ECL like balanc

Published: May 9, 2005 |