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KSZ9031RNX

Gigabit Ethernet Transceiver with RGMII Support

Micrel 

Micrel, Inc.

KSZ9031RNX

Contents

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

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

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

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

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

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

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

Pin Configuration..................................................................................................................................................................... 8

Pin Description ........................................................................................................................................................................ 9

Strapping Options ................................................................................................................................................................. 14

Functional Overview.............................................................................................................................................................. 15

Functional Description: 10Base-T/100Base-TX Transceiver ................................................................................................ 16

100Base-TX Transmit.......................................................................................................................................................................... 16

100Base-TX Receive........................................................................................................................................................................... 16

Scrambler/De-Scrambler (100Base-TX only) ...................................................................................................................................... 16

10Base-T Transmit .............................................................................................................................................................................. 16

10Base-T Receive ............................................................................................................................................................................... 16

Functional Description: 1000Base-T Transceiver ................................................................................................................. 17

Analog Echo-Cancellation Circuit ........................................................................................................................................................ 17

Automatic Gain Control (AGC) ............................................................................................................................................................ 17

Analog-to-Digital Converter (ADC) ...................................................................................................................................................... 18

Timing Recovery Circuit ...................................................................................................................................................................... 18

Adaptive Equalizer............................................................................................................................................................................... 18

Trellis Encoder and Decoder ............................................................................................................................................................... 18

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

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

Pair-Swap, Alignment, and Polarity Check .......................................................................................................................................... 19

Wave Shaping, Slew-Rate Control, and Partial Response .................................................................................................................. 19

PLL Clock Synthesizer ........................................................................................................................................................................ 19

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

10/100 Speeds Only.............................................................................................................................................................. 21

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

RGMII Signal Definition ....................................................................................................................................................................... 22

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

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

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

MII Management (MIIM) Interface......................................................................................................................................... 28

Interrupt (INT_N) ................................................................................................................................................................... 29

LED Mode ............................................................................................................................................................................. 29

Single-LED Mode ................................................................................................................................................................................ 29

Tri-color Dual-LED Mode ..................................................................................................................................................................... 29

May 14, 2015

4

Revision 2.2

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