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KSZ9021GN

Gigabit Ethernet Transceiver with GMII / MII Support

Micrel 

KSZ9021GN

Gigabit Ethernet Transceiver

with GMII / MII Support

General Description

Features

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.

• 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

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.

The KSZ9021GN is available in a 64-pin, lead-free QFN

package (See Ordering Information).

• 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

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Functional Diagram

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

September 2010

M9999-091010-1.1

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