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KSZ8842-MQL

2-Port Ethernet Switch with Non-PCI Interface

Micrel 

Micrel, Inc.

KSZ8842-16/32 MQL/MVL/MVLI/MBL

Content

Pin Configuration for KSZ8842-16 Switches (8/16-Bit) ...................................................................................... 11

Ball Configuration for KSZ8842-16 Switches (8/16-Bit) ..................................................................................... 12

Pin Description for KSZ8842-16 Switches (8/16-Bit) .......................................................................................... 13

Ball Description for KSZ8842-16 Switches (8/16-Bit) ......................................................................................... 18

Pin Configuration for KSZ8842-32 Switches (32-Bit).......................................................................................... 22

Pin Description for KSZ8842-32 Switches (32-Bit) ............................................................................................. 23

Functional Description .......................................................................................................................................... 28

Functional Overview: Physical Layer Transceiver ............................................................................................. 28

100BASE-TX Transmit ..........................................................................................................................................................28

100BASE-TX Receive ...........................................................................................................................................................28

Scrambler/De-scrambler (100BASE-TX only)........................................................................................................................28

10BASE-T Transmit...............................................................................................................................................................28

10BASE-T Receive................................................................................................................................................................28

Power Management...............................................................................................................................................................29

MDI/MDI-X Auto Crossover ...................................................................................................................................................29

Straight Cable ...................................................................................................................................................................29

Crossover Cable ...............................................................................................................................................................30

Auto Negotiation ....................................................................................................................................................................30

LinkMD Cable Diagnostics.....................................................................................................................................................31

Access ..............................................................................................................................................................................31

Usage ...............................................................................................................................................................................32

Functional Overview: MAC and Switch ............................................................................................................... 32

Address Lookup.....................................................................................................................................................................32

Learning.................................................................................................................................................................................32

Migration ................................................................................................................................................................................32

Aging .....................................................................................................................................................................................32

Forwarding.............................................................................................................................................................................33

Switching Engine ...................................................................................................................................................................35

MAC Operation......................................................................................................................................................................35

Inter Packet Gap (IPG) ..........................................................................................................................................................35

Back-Off Algorithm.................................................................................................................................................................35

Late Collision .........................................................................................................................................................................35

Legal Packet Size..................................................................................................................................................................35

Flow Control ..........................................................................................................................................................................35

Half-Duplex Backpressure .....................................................................................................................................................35

Broadcast Storm Protection...................................................................................................................................................36

Repeater Mode......................................................................................................................................................................36

Clock Generator ....................................................................................................................................................................36

Bus Interface Unit (BIU)......................................................................................................................................... 36

Asynchronous Interface .........................................................................................................................................................38

Synchronous Interface...........................................................................................................................................................39

Summary ...............................................................................................................................................................................39

BIU Implementation Principles...............................................................................................................................................41

Queue Management Unit (QMU) ........................................................................................................................... 41

Transmit Queue (TXQ) Frame Format...................................................................................................................................41

Receive Queue (RXQ) Frame Format ...................................................................................................................................42

Advanced Switch Functions ................................................................................................................................. 44

Spanning Tree Support..........................................................................................................................................................44

IGMP Support........................................................................................................................................................................45

“IGMP” Snooping ..............................................................................................................................................................45

October 2007

4

M9999-102207-1.9

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