Micrel, Inc.
KS8993M/ML/MI
April 2005
5
M9999-041205
Contents
List of Figures .........................................................................................................................................8
List of Tables...........................................................................................................................................8
Pin Description and I/O Assignment.....................................................................................................9
Pin Configuration..................................................................................................................................19
Functional Description .........................................................................................................................20
Functional Overview: Physical Layer Transceiver ............................................................................20
100BASE-TX Transmit.........................................................................................................................................................20
100BASE-TX Receive ..........................................................................................................................................................20
PLL Clock Synthesizer........................................................................................................................................................21
Scrambler/De-scrambler (100BASE-TX Only) ...................................................................................................................21
100BASE-FX Operation.......................................................................................................................................................21
100BASE-FX Signal Detection............................................................................................................................................21
100BASE-FX Far End Fault.................................................................................................................................................21
10BASE-T Transmit .............................................................................................................................................................21
10BASE-T Receive ..............................................................................................................................................................22
Power Management.............................................................................................................................................................22
MDI /MDI-X Auto Crossover................................................................................................................................................22
Straight Cable ................................................................................................................................................................23
Crossover Cable ............................................................................................................................................................24
Auto Negotiation .................................................................................................................................................................24
Functional Overview: MAC and Switch ..............................................................................................26
Address Lookup ..................................................................................................................................................................26
Learning ...............................................................................................................................................................................26
Migration ..............................................................................................................................................................................26
Aging ....................................................................................................................................................................................26
Forwarding...........................................................................................................................................................................26
Switching Engine ................................................................................................................................................................29
MAC Operation ....................................................................................................................................................................29
Inter Packet Gap (IPG) ..................................................................................................................................................29
Back-Off Algorithm.........................................................................................................................................................29
Late Collision .................................................................................................................................................................29
Illegal Frames ................................................................................................................................................................29
Flow Control...................................................................................................................................................................29
Half-Duplex Backpressure .............................................................................................................................................29
Broadcast Storm Protection ...........................................................................................................................................30
MII Interface Operation........................................................................................................................................................30
SNI (7-Wire) Operation ........................................................................................................................................................31
MII Management Interface (MIIM) .......................................................................................................................................31
Serial Management Interface (SMI) ....................................................................................................................................32
Advanced Switch Functions ................................................................................................................33
Spanning Tree Support.......................................................................................................................................................33
Upstream Special Tagging Mode .......................................................................................................................................34
IGMP Support ......................................................................................................................................................................35
“IGMP” Snooping ...........................................................................................................................................................35
“Multicast Address Insertion” in the Static MAC Table ...................................................................................................35
Port Mirroring Support........................................................................................................................................................35
IEEE 802.1Q VLAN Support ................................................................................................................................................35
QoS Priority Support...........................................................................................................................................................36
Rate Limiting Support .........................................................................................................................................................38
Configuration Interface .......................................................................................................................................................38
I
2C Master Serial Bus Configuration ..............................................................................................................................38
I
2C Slave Serial Bus Configuration ................................................................................................................................39
SPI Slave Serial Bus Configuration ...............................................................................................................................39
Loopback Support...............................................................................................................................................................43
MII Management (MIIM) Registers .......................................................................................................44
Register 0: MII Basic Control..........................................................................................................................................45