Micrel, Inc.

KSZ9021RL/RN

October 2009

4

M9999-101309-1.1

Contents

Pin Configuration – KSZ9021RL

.......................................................................................................................................... 8

Pin Description – KSZ9021RL

.............................................................................................................................................. 9

Strapping Options – KSZ9021RL

....................................................................................................................................... 14

Pin Configuration – KSZ9021RN

........................................................................................................................................ 15

Pin Description – KSZ9021RN

........................................................................................................................................... 16

Strapping Options – KSZ9021RN

...................................................................................................................................... 21

Functional Overview

........................................................................................................................................................... 22

Functional Description: 10Base-T/100Base-TX Transceiver

......................................................................................... 23

100Base-TX Transmit....................................................................................................................................................... 23

100Base-TX Receive........................................................................................................................................................ 23

Scrambler/De-scrambler (100Base-TX only).................................................................................................................... 23

10Base-T Transmit ........................................................................................................................................................... 23

10Base-T Receive ............................................................................................................................................................ 23

Functional Description: 1000Base-T Transceiver

.......................................................................................................... 24

Analog Echo Cancellation Circuit ..................................................................................................................................... 24

Automatic Gain Control (AGC) ......................................................................................................................................... 24

Analog-to-Digital Converter (ADC) ................................................................................................................................... 24

Timing Recovery Circuit.................................................................................................................................................... 25

Adaptive Equalizer............................................................................................................................................................ 25

Trellis Encoder and Decoder ............................................................................................................................................ 25

Functional Description: 10/100/1000 Transceiver Features

.......................................................................................... 25

Auto MDI/MDI-X................................................................................................................................................................ 25

Pair- Swap, Alignment, and Polarity Check...................................................................................................................... 26

Wave Shaping, Slew Rate Control and Partial Response................................................................................................ 26

PLL Clock Synthesizer...................................................................................................................................................... 26

Auto-Negotiation

................................................................................................................................................................. 26

RGMII Interface

.................................................................................................................................................................... 28

RGMII Signal Definition .................................................................................................................................................... 29

RGMII Signal Diagram...................................................................................................................................................... 29

RGMII In-band Status ....................................................................................................................................................... 30

MII Management (MIIM) Interface

....................................................................................................................................... 30

Interrupt (INT_N)

.................................................................................................................................................................. 30

LED Mode

............................................................................................................................................................................. 31

Single LED Mode.............................................................................................................................................................. 31

Tri-color Dual LED Mode .................................................................................................................................................. 31

NAND Tree Support

............................................................................................................................................................ 32

Power Management

............................................................................................................................................................ 33