KSZ9021RL View Datasheet(PDF) - Micrel

Part Name

Description

Manufacturer

KSZ9021RL

Gigabit Ethernet Transceiver with RGMII Support

Micrel 

KSZ9021RL/RN

Gigabit Ethernet Transceiver

with RGMII Support

Revision 1.2

General Description

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.

The KSZ9021RL 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 KSZ9021RL 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.

The KSZ9021RL is available in a 64-pin, lead-free E-LQFP

package, and is offered as the KSZ9021RN in the smaller

48-pin QFN package (See Ordering Information).

Features

• Single-chip 10/100/1000Mbps IEEE 802.3 compliant

Ethernet Transceiver

• RGMII interface compliant to RGMII Version 1.3

• RGMII I/Os with 3.3V/2.5V tolerant and programmable

timings to adjust and correct delays on both Tx and Rx

paths

• 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

____________________________________________________________________________________________________________

Functional Diagram

10/100/1000 Mbps

RGMII

Ethernet MAC

RGMII

MDC / MDIO

Management

KSZ9021RL/RN

VIN

3.3VA

LDO

Controller

VOUT

1.2V (for core voltages)

RJ-45

Connector

Media Types:

10Base-T

100Base-TX

1000Base-T

LinkMD is a registered trademark of Micrel, Inc.

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

February 13, 2014

Revision 1.2

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