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KS8995X

Integrated 5-Port 10/100 QoS Switch

Micrel 

KS8995X

Micrel

Table of Contents

System Level Applications .............................................................................................................................................................. 6

Pin Description (by Number) ........................................................................................................................................................... 8

Pin Description (by Name) ............................................................................................................................................................ 13

Pin Configuration ........................................................................................................................................................................... 18

Introduction ............................................................................................................................................................................ 19

Functional Overview: Physical Layer Transceiver ..................................................................................................................... 19

100BaseTX Transmit ............................................................................................................................................................... 19

100BaseTX Receive ................................................................................................................................................................ 19

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

Scrambler/De-scrambler (100BaseTX only) ............................................................................................................................ 19

100BaseFX Operation ............................................................................................................................................................. 19

100BaseFX Signal Detection ................................................................................................................................................... 20

100BaseFX Far End Fault ....................................................................................................................................................... 20

10BaseT Transmit ................................................................................................................................................................... 20

10BaseT Receive .................................................................................................................................................................... 20

Power Management ................................................................................................................................................................ 20

MDI/MDI-X Auto Crossover ..................................................................................................................................................... 20

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

Functional Overview: Switch Core ............................................................................................................................................... 21

Address Look Up ..................................................................................................................................................................... 21

Learning ............................................................................................................................................................................ 21

Migration ............................................................................................................................................................................ 21

Aging

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

Switching Engine ..................................................................................................................................................................... 21

MAC (Media Access Controller) Operation ............................................................................................................................. 22

Inter-Packet Gap ............................................................................................................................................................. 22

Backoff Algorithm ............................................................................................................................................................ 22

Late Collision .................................................................................................................................................................. 22

Illegal Frame ................................................................................................................................................................... 22

Flow Control .................................................................................................................................................................... 22

Half-Duplex Back Pressure ............................................................................................................................................. 22

Broadcast Storm Protection ............................................................................................................................................ 23

MII Interface Operation .................................................................................................................................................................. 23

SNI Interface Operation ................................................................................................................................................................. 25

Advanced Functionality ................................................................................................................................................................. 25

QoS Support ............................................................................................................................................................................ 25

Rate Limit Support ................................................................................................................................................................... 27

Configuration Interface ............................................................................................................................................................ 28

I2C Master Serial Bus Configuration ............................................................................................................................... 28

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

Register Map ............................................................................................................................................................................ 29

Global Registers ...................................................................................................................................................................... 29

Register 0 (0x00): Chip ID0 ............................................................................................................................................ 29

Register 1 (0x01): Chip ID1/Start Switch ....................................................................................................................... 29

Register 2 (0x02): Global Control 0 ................................................................................................................................ 29

Register 3 (0x03): Global Control 1 ................................................................................................................................ 30

Register 4 (0x04): Global Control 2 ................................................................................................................................ 31

Register 5 (0x05): Global Control 3 ................................................................................................................................ 31

Register 6 (0x06): Global Control 4 ................................................................................................................................ 32

Register 7 (0x07): Global Control 5 ................................................................................................................................ 32

M9999-120403

4

December 2003

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