SMSC COM20020 User Manual
COM20020
COM20020 ULANC
Universal Local Area Network Controller
with 2K x 8 On-Board RAM
FEATURES
•
24-Pin Embedded Network Controller/
Transceiver/RAM
•
Ideal for Industrial/Factory Automation
and Automotive Applications
•
Deterministic, 2.5 Mbps, Token Passing
ARCNET Protocol
•
Minimal Microcontroller and Media
Interface Logic Required
•
Flexible Microcontroller Interface for Use
with 80XX, 68XX, etc.
•
Automatically Detects Type of
Microcontroller Interface:
-
-
Non-Multiplexed or Multiplexed Bus
-
Separate nRD & nWR Lines or DIR &
nDS Lines
nDS Lines
•
Full 2Kx8 On-Chip RAM
•
Command Chaining for Top Performance
•
Reduced Reconfiguration Times
•
Sequential Access to Internal RAM
•
Software Programmable Node ID
•
Duplicate Node ID Detection
•
Powerful Diagnostics
•
Receive All Mode
•
Data Rates from 2.5 Mbps to 156.25 Kbps
•
24-Pin DIP or 28-Pin PLCC Package
•
Flexible Media Interface:
-
Traditional Hybrid Interface for Long
Distances
-
RS485 Differential Driver Interface for
Low Cost, Low Power, High Reliability
Low Cost, Low Power, High Reliability
-
Backplane Mode for Direct Connection to
Media in Short Distance Applications
Media in Short Distance Applications
•
Eight, 256-Byte Pages Allow 4 Pages TX
and RX Plus Scratch-Pad Memory
•
No Wait-State Arbitration
•
Programmable TXEN Polarity
•
Next ID Readable
•
Internal Clock Prescaler for Slower Network
Speed without Slowing Arbitration
•
Operating Temperature Range of -40
o
C to
+85
o
C, or 0
o
C to +70
o
C
•
Self-Reconfiguration Protocol
•
Supports up to 255 Nodes
•
Supports Various Network Topologies (Star,
Tree, Bus...)
•
CMOS, Single +5V Supply
GENERAL DESCRIPTION
SMSC's COM20020 is a member of the family
of Industrial Network Controllers from Standard
Microsystems Corporation. The device is a
special purpose communications controller for
networking microcontrollers and intelligent
peripherals in industrial, automotive, and
of Industrial Network Controllers from Standard
Microsystems Corporation. The device is a
special purpose communications controller for
networking microcontrollers and intelligent
peripherals in industrial, automotive, and
embedded control environments using an
ARCNET
ARCNET
®
protocol engine. The small 24-pin
package, flexible microcontroller and media
interfaces, eight-page message support, and
extended temperature range of the COM20020
make it the only true network
interfaces, eight-page message support, and
extended temperature range of the COM20020
make it the only true network