COM20020D Datasheet, PDF (1/72 Pages) SMSC Corporation – ULANC Revision D Universal Local Area Network Controller with 2K x 8 On-Board RAM

COM20020D
COM20020 ULANC
Revision D
Universal Local Area Network Controller
with 2K x 8 On-Board RAM
FEATURES
• New Features for Rev. D
- Data Rates up to 5 Mbps
- Programmable Reconfiguration Times
• 24 Pin DIP, 28 Pin PLCC Package
• Ideal for Industrial/Factory/Building
Automation and Transportation
Applications
• Deterministic, (ANSI 878.1), Token Passing
ARCNET Protocol
• Minimal Microcontroller and Media
Interface Logic Required
• Flexible Interface For Use With All
Microcontrollers or Microprocessors
• Automatically Detects Type of
Microcontroller Interface
• 2Kx8 On-Chip Dual Port RAM
• Command Chaining for Packet Queuing
• Sequential Access to Internal RAM
• Software Programmable Node ID
• Eight, 256 Byte Pages Allow Four Pages TX
and RX Plus Scratch-Pad Memory
• Next ID Readable
• Internal Clock Scaler and Clock Multiplier for
Adjusting Network Speed
• Operating Temperature Range of -40^oC to
+85^oC
• Self-Reconfiguration Protocol
• Supports up to 255 Nodes
• Supports Various Network Topologies (Star,
Tree, Bus...)
• CMOS, Single +5V Supply
• Duplicate Node ID Detection
• Powerful Diagnostics
• Receive All Packets Mode
• Flexible Media Interface:
- Traditional Hybrid Interface For Long
Distances up to Four Miles at 2.5Mbps.
- RS485 Differential Driver Interface For
Low Cost, Low Power, High Reliability
GENERAL DESCRIPTION
SMSC's COM20020D 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 24 pin
package, flexible microcontroller and media
interfaces, eight- page message support, and
extended temperature range of the COM20020D
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