KSZ9021GN-TR

The KSZ9021GN 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 KSZ9021GN provides 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 1000 Mbps or 10/100Mbps speed.

The KSZ9021GN reduces board cost and simplifies board layout by using on-chip termination resistors for the four differential pairs and by integrating a LDO controller to drive a low cost MOSFET to supply the 1.2V core.

The KSZ9021GN provides diagnostic features to facilitate system bring-up and debugging in production testing and in product deployment. Parametric NAND tree support enables fault detection between KSZ9021 I/Os and board. Micrel LinkMD TDR-based cable diagnostics permit identification of faulty copper cabling. Remote and local loopback functions provide verification of analog and digital data paths.

• Single-chip 10/100/1000Mbps IEEE 802.3 compliant Ethernet Transceiver
• GMII/MII standard compliant interface
• Auto-negotiation to automatically select the highest link up speed (10/100/100Mbps) 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 external FET to generate 1.2V for the core
• Jumbo frame support up to 16KB
• 125MHz Reference Clock Output
• Programmable LED outputs for link, activity and speed
• Baseline Wander Correction
• LinkMD® TDR-based cable diagnostics for identification of faulty copper cabling
• Parametric NAND Tree support for fault detection between chip I/Os and board
• Loopback modes for diagnostics
• Automatic MDI/MDI-X crossover for detection and correction of pair swap at all speeds of operation