Features
• Single-Chip 10/100/1000 Mbps Ethernet Transceiver
Suitable for IEEE 802.3 Applications
• RGMII Timing Supports On-Chip Delay According
to RGMII Version 2.0, with Programming Options
for External Delay and Making Adjustments and
Corrections to TX and RX Timing Paths
• RGMII with 3.3V/2.5V/1.8V Tolerant I/Os
• Auto-Negotiation to Automatically Select the
Highest Link-Up Speed (10/100/1000 Mbps) and
Duplex (Half/Full)
• On-Chip Termination Resistors for the Differential
Pairs
• On-Chip LDO Controller to Support Single 3.3V
Supply Operation – Requires Only One External
FET to Generate 1.2V for the Core
• Jumbo Frame Support up to 16 KB
• 125 MHz Reference Clock Output
• Energy Detect Power-Down Mode for Reduced
Power Consumption When the Cable is Not
Attached
• Wake-On-LAN (WOL) Support with Robust Custom-
Packet Detection
• Programmable LED Outputs for Link, Activity, and
Speed
• Baseline Wander Correction
• LinkMD TDR-Based Cable Diagnostic to Identify
Faulty Copper Cabling
• Parametric NAND Tree Support to Detect Faults
Between Chip I/Os and Board
• Loopback Modes for Diagnostics
• Automatic MDI/MDI-X Crossover to Detect and
Correct Pair Swap at all Speeds of Operation
• Automatic Detection and Correction of Pair
Swaps, Pair Skew, and Pair Polarity
• MDC/MDIO Management Interface for PHY Register
Configuration
• Interrupt Pin Option
• Power-Down and Power-Saving Modes
• Operating Voltages
- Core (DVDDL, AVDDL, AVDDL_PLL): 1.2V
(External FET or Regulator)
- VDD I/O (DVDDH): 3.3V, 2.5V, or 1.8V
- Transceiver (AVDDH): 3.3V or 2.5V (Commercial
Temp.)
• AEC-Q100 Grade 3 (KSZ9031RNXUA/UB) and
Grade 2 (KSZ9031RNXVA/VB) Qualified for Automotive

Applications
• 48-pin QFN (7 mm × 7 mm) Package
Target Applications
• Laser/Network Printer
• Network Attached Storage (NAS)
• Network Server
• Gigabit LAN on Motherboard (GLOM)
• Broadband Gateway
• Gigabit SOHO/SMB Router
• IPTV
• IP Set-Top Box
• Game Console
• Triple-Play (Data, Voice, Video) Media Center
• Industrial Control
• Automotive In-Vehicle Networking