The KSZ9031 is a completely integrated triple-speed (10Base-T/100Base-TX/1000Base-T) Ethernet physical-layer transceiver for transmission and reception of data on standard CAT-5 unshielded twisted pair (UTP) cable.
The KSZ9031MNX offers the industry-standard GMII/MII (Gigabit Media Independent Interface/Media Independent Interface) for connection to GMII/MII MACs in Gigabit Ethernet processors and switches for data transfer at 1000Mbps or 10/100Mbps. The KSZ9031RNX provides the reduced gigabit media independent interface (RGMII).
The KSZ9031 reduces board cost and simplifies board layout by using on-chip termination resistors for the four differential pairs and by integrating an LDO controller to drive a low-cost MOSFET to supply the 1.2V core. The KSZ9031 offers diagnostic features to facilitate system bring-up and debugging in production testing and in product deployment. Parametric NAND tree support enables fault detection between KSZ9031 I/Os and the board. The LinkMD® TDR-based cable diagnostic identifies faulty copper cabling. Remote and local loopback functions verify analog and digital data paths.
The standard KSZ9031RNX is available in the 48-pin, lead-free QFN package, and the AEC-Q100 automotive qualified parts, KSZ9031RNXUB-VAO and KSZ9031RNXVB-VAO, are available in the 48-pin lead-free WQFN package. The KSZ9031MNX is available in a 64-pin, lead-free QFN package.
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Additional Features

• Single-chip 10/100/1000Mbps IEEE 802.3 compliant Ethernet transceiver
• KSZ9031Mxx feature GMII/MII standard interface with 3.3V/2.5V/1.8V tolerant I/Os
• KSZ9031Rxx feature 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
• GMII/MII/RGMII with 3.3V/2.5V/1.8V tolerant I/Os
• Auto-negotiation to automatically select the highest linkup speed (10/100/1000Mbps) 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 16KB
• 125MHz Reference Clock Output
• Energy-detect power-down mode for reduced power consumption when the cable is not attached <! - - Energy Efficient Ethernet (EEE) support with low-power idle (LPI) mode and clock stoppage for 100Base-TX/1000Base-T and transmit amplitude reduction with 10Base-Te option - - > <li>Wake-on-LAN (WOL) support with robust custom-packet detection</li> <li>AEC-Q100 qualified for automotive applications (KSZ9031RNXUB-VAO, KSZ9031RNXVB-VAO)</li> <li>Programmable LED outputs for link, activity, and speed</li> <li>Baseline wander correction</li> <li>LinkMD® TDR-based cable diagnostic to identify faulty copper cabling</li> <li>Parametric NAND tree support to detect faults between chip I/Os and board</li> <li>Loopback modes for diagnostics</li> <li>Automatic MDI/MDI-X crossover to detect and correct pair swap at all speeds of operation</li> <li>Automatic detection and correction of pair swaps, pair skew, and pair polarity</li> <li>MDC/MDIO management interface for PHY register configuration</li> <li>Interrupt pin option</li> <li>Power-down and power-saving modes</li> <li>Operating voltages: <ul><li>Core (DVDDL, AVDDL, AVDDL_PLL): 1.2V (external FET or regulator)</li> <li>VDD I/O (DVDDH): 3.3V, 2.5V, or 1.8V</li> <li>Transceiver (AVDDH): 3.3V or 2.5V (commercial temp)</li></ul> </li> <li>Available in 48-pin QFN (7mm x 7mm) and 64-pin QFN (8mm x 8mm) packages</li></ul></li></ul></td>