10 Mbps ARCNET (ANSI 878.1) Controller with 2Kx8 On-Board RAM
Datasheet
Chapter 1 General Description
SMSC's COM20022I 3V is a member of the family of Embedded ARCNET Controllers from Standard
Microsystems Corporation. The device is a general purpose communications controller for networking
microcontrollers and intelligent peripherals in industrial, automotive, and embedded control environments
using an ARCNET protocol engine. The small 48 pin package, flexible microcontroller and media
interfaces, eight- page message support, and extended temperature range of the COM20022I 3V make it
the only true network controller optimized for use in industrial, embedded, and automotive applications.
Using an ARCNET protocol engine is the ideal solution for embedded control applications because it
provides a deterministic token-passing protocol, a highly reliable and proven networking scheme, and a
data rate of up to 10 Mbps when using the COM20022I 3V. A token-passing protocol provides predictable
response times because each network event occurs within a predetermined time interval, based upon the
number of nodes on the network.
The deterministic nature of ARCNET is essential in real time
applications. The integration of the 2Kx8 RAM buffer on-chip, the Command Chaining feature, the 10
Mbpsmaximum data rate, and the internal diagnostics make the COM20022I 3V the highest performance
embedded communications device available. With only one COM20022I 3V and one microcontroller, a
complete communications node may be implemented.
NOTE:
For more details on the ARCNET protocol engine and traditional dipulse signaling schemes, please
refer to the ARCNET Local Area Network Standard, or the ARCNET Designer's Handbook, available
from Datapoint Corporation.
Revision 02-27-06
Page 6
SMSC COM20022I 3V
DATASHEET
SMSC [ SMSC CORPORATION ]
