Micrel, Inc.
KSZ8993M/ML
Contents
List of Figures .........................................................................................................................................9
List of Tables...........................................................................................................................................9
Pin Description and I/O Assignment...................................................................................................10
Pin Configuration..................................................................................................................................20
Functional Description .........................................................................................................................21
Functional Overview: Physical Layer Transceiver ............................................................................21
100BASE-TX Transmit.........................................................................................................................................................21
100BASE-TX Receive ..........................................................................................................................................................21
PLL Clock Synthesizer........................................................................................................................................................22
Scrambler/De-scrambler (100BASE-TX Only) ...................................................................................................................22
100BASE-FX Operation.......................................................................................................................................................22
100BASE-FX Signal Detection............................................................................................................................................22
100BASE-FX Far End Fault.................................................................................................................................................22
10BASE-T Transmit .............................................................................................................................................................23
10BASE-T Receive ..............................................................................................................................................................23
Power Management.............................................................................................................................................................23
MDI /MDI-X Auto Crossover................................................................................................................................................23
Straight Cable
................................................................................................................................................................23
Crossover Cable ............................................................................................................................................................25
Auto Negotiation .................................................................................................................................................................25
Functional Overview: MAC and Switch ..............................................................................................27
Address Lookup ..................................................................................................................................................................27
Learning ...............................................................................................................................................................................27
Migration ..............................................................................................................................................................................27
Aging ....................................................................................................................................................................................27
Forwarding...........................................................................................................................................................................27
Switching Engine ................................................................................................................................................................30
MAC Operation ....................................................................................................................................................................30
Inter Packet Gap (IPG) ..................................................................................................................................................30
Back-Off Algorithm.........................................................................................................................................................30
Late Collision .................................................................................................................................................................30
Illegal Frames ................................................................................................................................................................30
Flow Control...................................................................................................................................................................30
Half-Duplex Backpressure .............................................................................................................................................30
Broadcast Storm Protection ...........................................................................................................................................31
MII Interface Operation........................................................................................................................................................31
SNI (7-Wire) Operation ........................................................................................................................................................32
MII Management Interface (MIIM) .......................................................................................................................................32
Serial Management Interface (SMI) ....................................................................................................................................33
Advanced Switch Functions ................................................................................................................34
Spanning Tree Support.......................................................................................................................................................34
Upstream Special Tagging Mode .......................................................................................................................................35
IGMP Support ......................................................................................................................................................................36
“IGMP” Snooping ...........................................................................................................................................................36
“Multicast Address Insertion” in the Static MAC Table...................................................................................................36
Port Mirroring Support........................................................................................................................................................36
IEEE 802.1Q VLAN Support ................................................................................................................................................36
QoS Priority Support...........................................................................................................................................................37
Rate Limiting Support .........................................................................................................................................................39
Configuration Interface .......................................................................................................................................................39
I
2
C Master Serial Bus Configuration ..............................................................................................................................39
I
2
C Slave Serial Bus Configuration ................................................................................................................................40
SPI Slave Serial Bus Configuration ...............................................................................................................................40
Loopback Support...............................................................................................................................................................44
MII Management (MIIM) Registers .......................................................................................................45
October 2008
6
M9999-020606
MICREL [ MICREL SEMICONDUCTOR ]
