General Description
The number of applications requiring Ethernet Connectivity
continues to expand. Along with this
increased market demand is a change in application
requirements. Where single channel Ethernet used to
be sufficient, many applications such as wireless
remote base stations and industrial networking now
require DUAL Port functionality for redundancy or system
management.
The DP83849C is a highly reliable, feature rich device
perfectly suited for commercial or industrial applications
enabling Ethernet on the factory floor. The
DP83849C features two fully independent 10/100 ports
for multi-port applications.
The DP83849C provides optimum flexibility in MPU
selection by supporting both MII and RMII interfaces.
In addition this device includes a powerful new diagnostics
tool to ensure initial network operation and
maintenance. In addition to the TDR scheme, commonly
used for detecting faults during installation,
NATIONAL’s innovative cable diagnostics provides for
real time continuous monitoring of the link quality. This
allows the system designer to implement a fault prediction
mechanism to detect and warn of changing or
deteriorating link conditions.
With the DP83849C, National Semiconductor continues
to build on its Ethernet expertise and leadership
position by providing a powerful combination of features
and flexibility, easing Ethernet implementation for
the system designer.

Features
• Low-power 3.3V, 0.18μm CMOS technology
• Low power consumption <600mW Typical
• 3.3V MAC Interface
• Auto-MDIX for 10/100 Mb/s
• Energy Detection Mode
• Dynamic Integrity Utility
• Dynamic Link Quality Monitoring
• TDR based Cable Diagnostic and Cable Length Detection
• Optimized Latency for Real Time Ethernet Operation
• Reference Clock out
• RMII Rev. 1.2 Interface (configurable)
• SNI Interface (configurable)
• MII Serial Management Interface (MDC and MDIO)
• IEEE 802.3u MII
• IEEE 802.3u Auto-Negotiation and Parallel Detection
• IEEE 802.3u ENDEC, 10BASE-T transceivers and filters
• IEEE 802.3u PCS, 100BASE-TX transceivers and filters
• Integrated ANSI X3.263 compliant TP-PMD physical sub-layer
with adaptive equalization and Baseline Wander compensation
• Programmable LED support for Link, 10 /100 Mb/s Mode, Activity,
Duplex and Collision Detect
• Single register access for complete PHY status
• 10/100 Mb/s packet BIST (Built in Self Test)
• 80-pin TQFP package (12mm x 12mm)

Applications
• Medical Instrumentation
• Factory Automation
• Motor & Motion Control
• Wireless Remote Base Station
• General Embedded Applications