COM20051 View Datasheet(PDF) - SMSC -> Microchip

Part Name

Description

Manufacturer

COM20051

Integrated Microcontroller and Network Interface with Watchdog Timer and A/D Converter Interface

SMSC -> Microchip 

ARCNET Network Core - Overview and

Architecture

ARCNET is a baseband token passing network

protocol (ANSI 878.1). ARCNET features

deterministic behavior, hardware-based network

configuration, flexible topologies, several data

rates, and multiple media support. Data rates

varying from 5 Mbps to 156 Kbps and message

sizes from 1 to 508 bytes are supported.

Supported media includes RS-485, twisted pair,

coax and fiber optic in bus, star or tree

topologies. ARCNET has enjoyed widespread

use in the industrial community, finding a home

in such applications as I/O control/acquisition,

multi-processor communications, point-of-sale

terminals, in-vehicle navigation systems, data

acquisition systems, remote sensing, avionics,

machine control, embedded computing, building

automation, robotics, consumer products, and

security systems.

The ARCNET core used in the COM20051+ is

similar in architecture to SMSC's 200XX series

of Industrial ARCNET Controllers. The

ARCNET core of the COM20051+ contains a 1K

x 8 internal RAM for packet buffering, Duplicate

ID Detection, Receive All Mode, New Next ID

Indicator, Excessive NACK Interrupt,

Programmable Data Rates, Backplane Mode,

Programmable Transmitter Enable, Polarity

Receive Activity, Reconfiguration, Token Seen

Indicators, and Network Mapping Hooks. The

ARCNET core of the COM20051+ uses a

software-programmable node ID, thus requiring

the user to provide a switch or permanent

storage (EEPROM or EPROM) of the node ID.

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