KSZ8895MQI(2011) 데이터 시트보기 (PDF) - Micrel

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KSZ8895MQI
(Rev.:2011)

Integrated 5-Port 10/100 Managed Ethernet Switch with MII/RMII Interface

Micrel 

Micrel, Inc.

KSZ8895MQ/RQ/FMQ

Contents

Pin Configuration ..........................................................................................................................................................13

Pin Description ..............................................................................................................................................................14

Pin for Strap-in Options................................................................................................................................................21

Introduction ...................................................................................................................................................................24

Functional Overview: Physical Layer Transceiver ....................................................................................................24

100BASE-TX Transmit ...............................................................................................................................................24

100BASE-TX Receive ................................................................................................................................................24

PLL Clock Synthesizer................................................................................................................................................25

Scrambler/Descrambler (100BASE-TX only) .............................................................................................................25

100BASE-FX Operation..............................................................................................................................................25

100BASE-FX Signal Detection ...................................................................................................................................25

100BASE-FX Far End Fault........................................................................................................................................25

10BASE-T Transmit ....................................................................................................................................................25

10BASE-T Receive .....................................................................................................................................................25

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

Straight Cable .........................................................................................................................................................26

Crossover Cable .....................................................................................................................................................27

Auto-Negotiation .........................................................................................................................................................27

On-chip Termination Resistors ...................................................................................................................................29

Internal 1.2V LDO Controller ......................................................................................................................................29

Functional Overview: Power Management.................................................................................................................29

Normal Operation Mode .............................................................................................................................................29

Energy Detect Mode ...................................................................................................................................................30

Soft Power Down Mode ..............................................................................................................................................30

Power Saving Mode....................................................................................................................................................30

Port-based Power Down Mode...................................................................................................................................30

Functional Overview: Switch Core ..............................................................................................................................30

Address Look-Up ........................................................................................................................................................30

Learning ......................................................................................................................................................................30

Migration .....................................................................................................................................................................31

Aging ...........................................................................................................................................................................31

Forwarding ..................................................................................................................................................................31

Switching Engine ........................................................................................................................................................31

Media Access Controller (MAC) Operation ................................................................................................................31

Inter-Packet Gap (IPG) ...........................................................................................................................................31

Backoff Algorithm....................................................................................................................................................31

Late Collision ..........................................................................................................................................................31

Illegal Frames .........................................................................................................................................................31

Flow Control............................................................................................................................................................32

Half-Duplex Back Pressure ....................................................................................................................................35

Broadcast Storm Protection....................................................................................................................................35

MII Interface Operation ...............................................................................................................................................36

Port 5 PHY 5 P5-MII/RMII Interface............................................................................................................................36

September 2011

4

M9999-091911-1.4

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