KSZ9021RL Datasheet PDF - Micrel

●The KSZ9021RL is a completely integrated triple speed (10Base-T/100Base-TX/1000Base-T) Ethernet Physical-layer Transceiver for transmission and reception of data over standard CAT-5 unshielded twisted pair (UTP) cable. The KSZ9021RL provides the Reduced Gigabit Media Independent Interface (RGMII) for direct connection to RGMII MACs in gigabit Ethernet processors and switches for data transfer at 10/100/1000Mbps speed. It 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. It 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.

● On-chip termination resistors for the differential pairs

● 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

● Power down and power saving modes