KS8999 Micrel
KS8999 4 January 2005
Table of Contents
System Level Applications ......................................................................................................................................... 6
Pin Description ............................................................................................................................................................ 7
I/O Grouping ........................................................................................................................................................... 13
I/O Descriptions ......................................................................................................................................................... 13
Pin Configuration ...................................................................................................................................................... 19
Functional Overview: Physical Layer Transceiver ................................................................................................ 20
100BaseTX Transmit ........................................................................................................................................... 20
100BaseTX Receive ............................................................................................................................................ 20
PLL Clock Synthesizer......................................................................................................................................... 20
Scrambler/De-scrambler (100BaseTX only) ........................................................................................................ 20
100BaseFX Operation ......................................................................................................................................... 20
100BaseFX Signal Detection ............................................................................................................................... 20
100BaseFX Far End Fault ................................................................................................................................... 20
10BaseT Transmit ............................................................................................................................................... 20
10BaseT Receive ................................................................................................................................................ 20
Power Management............................................................................................................................................. 21
Power Save Mode........................................................................................................................................ 21
MDI/MDI-X Auto Crossover ................................................................................................................................. 21
Auto-Negotiation .................................................................................................................................................. 21
Functional Overview: Switch Core.......................................................................................................................... 22
Address Look-Up ................................................................................................................................................. 22
Learning ........................................................................................................................................................... 22
Migration ........................................................................................................................................................... 22
Aging ........................................................................................................................................................... 22
Forwarding ........................................................................................................................................................... 22
Switching Engine ................................................................................................................................................. 22
MAC Operation .................................................................................................................................................... 22
Inter Packet Gap (IPG) ................................................................................................................................ 22
Backoff Algorithm ......................................................................................................................................... 23
Late Collision ............................................................................................................................................... 23
Illegal Frames .............................................................................................................................................. 23
Flow Control ................................................................................................................................................. 23
Half-Duplex Back Pressure .......................................................................................................................... 23
Broadcast Storm Protection ................................................................................................................................. 23
MII Interface Operation.............................................................................................................................................. 24
SNI Interface (7-wire) Operation............................................................................................................................... 26
Prorammable Features.............................................................................................................................................. 26
Priority Schemes.................................................................................................................................................. 26
Per Port Method................................................................................................................................................... 26
802.1p Method ..................................................................................................................................................... 26
IPv4 DSCP Method.............................................................................................................................................. 26
Other Priority Considerations............................................................................................................................... 26
VLAN Operation ......................................................................................................................................................... 27
Station MAC Address ................................................................................................................................................ 27
EEPROM Operation ................................................................................................................................................... 28
Optional CPU Interface ............................................................................................................................................. 28