KSZ9021RL View Datasheet(PDF) - Micrel

Part Name

Description

Manufacturer

KSZ9021RL

Gigabit Ethernet Transceiver with RGMII Support

Micrel 

Micrel, Inc.

KSZ9021RL/RN

Functional Overview

The KSZ9021RL/RN is a completely integrated triple speed (10Base-T/100Base-TX/1000Base-T) Ethernet Physical Layer

Transceiver solution for transmission and reception of data over a standard CAT-5 unshielded twisted pair (UTP) cable.

Its on-chip proprietary 1000Base-T transceiver and Manchester/MLT-3 signaling-based 10Base-T/100Base-TX

transceivers are all IEEE 802.3 compliant.

The KSZ9021RL/RN 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.

On the copper media interface, the KSZ9021RL/RN can automatically detect and correct for differential pair

misplacements and polarity reversals, and correct propagation delays and re-sync timing between the four differential

pairs, as specified in the IEEE 802.3 standard for 1000Base-T operation.

The KSZ9021RL/RN provides the RGMII interface for a direct and seamless connection to RGMII MACs in Gigabit

Ethernet Processors and Switches for data transfer at 10/100/1000Mbps speed.

The following figure shows a high-level block diagram of the KSZ9021RL/RN.

PMA

TX10/100/1000

MEDIA

INTERFACE

PMA

RX1000

PMA

RX100

Clock Reset

Configurations

PCS1000

PCS100

RGMII

Interface

PMA

RX10

PCS10

AUTO

NEGOTIATION

LED

DRIVERS

Figure 1. KSZ9021RL/RN Block Diagram

February 13, 2014

22

Revision 1.2

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