Micrel, Inc.

KSZ9031RNX

October 2012

4

M9999-103112-1.0

Contents

General Description ................................................................................................................................................................ 1

Features .................................................................................................................................................................................. 1

Functional Diagram ................................................................................................................................................................. 1

Features (Continued) .............................................................................................................................................................. 2

Applications ............................................................................................................................................................................. 2

Ordering Information ............................................................................................................................................................... 2

Revision History ...................................................................................................................................................................... 3

Contents .................................................................................................................................................................................. 4

List of Figures.......................................................................................................................................................................... 7

List of Tables ........................................................................................................................................................................... 8

Pin Configuration..................................................................................................................................................................... 9

Pin Description ...................................................................................................................................................................... 10

Strapping Options ................................................................................................................................................................. 15

Functional Overview.............................................................................................................................................................. 16

Functional Description: 10Base-T/100Base-TX Transceiver ................................................................................................ 17

100Base-TX Transmit.......................................................................................................................................................................... 17

100Base-TX Receive........................................................................................................................................................................... 17

Scrambler/De-Scrambler (100Base-TX only) ...................................................................................................................................... 17

10Base-T Transmit .............................................................................................................................................................................. 17

10Base-T Receive ............................................................................................................................................................................... 17

Functional Description: 1000Base-T Transceiver ................................................................................................................. 18

Analog Echo-Cancellation Circuit ........................................................................................................................................................ 18

Automatic Gain Control (AGC) ............................................................................................................................................................ 18

Analog-to-Digital Converter (ADC) ...................................................................................................................................................... 19

Timing Recovery Circuit ...................................................................................................................................................................... 19

Adaptive Equalizer............................................................................................................................................................................... 19

Trellis Encoder and Decoder ............................................................................................................................................................... 19

Functional Description: 10/100/1000 Transceiver Features ................................................................................................. 19

Auto MDI/MDI-X .................................................................................................................................................................................. 19

Pair-Swap, Alignment, and Polarity Check .......................................................................................................................................... 20

Wave Shaping, Slew-Rate Control, and Partial Response .................................................................................................................. 20

PLL Clock Synthesizer ........................................................................................................................................................................ 20

Auto-Negotiation ................................................................................................................................................................... 20

RGMII Interface ..................................................................................................................................................................... 22

RGMII Signal Definition ....................................................................................................................................................................... 23

RGMII Signal Diagram......................................................................................................................................................................... 23

RGMII Pad Skew Registers ................................................................................................................................................................. 23

RGMII In-Band Status ......................................................................................................................................................................... 27

MII Management (MIIM) Interface......................................................................................................................................... 27

Interrupt (INT_N) ................................................................................................................................................................... 28