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4, 2015 4 Revision 1.4
Contents
List of Figures .......................................................................................................................................................................... 6
List of Tables ........................................................................................................................................................................... 7
Pin Configuration ..................................................................................................................................................................... 8
Pin Description ........................................................................................................................................................................ 9
Pin for Strap-In Options ......................................................................................................................................................... 13
Introduction ............................................................................................................................................................................ 16
Functional Overview: Physical Layer Transceiver ................................................................................................................ 16
100BASE-TX Transmit ...................................................................................................................................................... 16
100BASE-TX Receive ....................................................................................................................................................... 16
PLL Clock Synthesizer ...................................................................................................................................................... 16
Scrambler/De-Scrambler (100BASE-TX only) .................................................................................................................. 16
10BASE-T Transmit ........................................................................................................................................................... 17
10BASE-T Receive ............................................................................................................................................................ 17
MDI/MDI-X Auto Crossover ............................................................................................................................................... 17
Auto-Negotiation ................................................................................................................................................................ 19
LinkMD® Cab le Di agn os tic s ............................................................................................................................................... 21
On-Chip Termination Resistors ......................................................................................................................................... 22
Functional Overview: Power Management ........................................................................................................................... 23
Normal Operation Mode .................................................................................................................................................... 23
Energy Detect Mode .......................................................................................................................................................... 23
Soft Power-Down Mode ..................................................................................................................................................... 24
Power Saving Mod e .......................................................................................................................................................... 24
Port-Bas ed Po wer -Do wn Mode ......................................................................................................................................... 24
Functional Overview: Switch Core ........................................................................................................................................ 24
Address Look-Up ............................................................................................................................................................... 24
Learning ............................................................................................................................................................................. 24
Migration ............................................................................................................................................................................ 24
Aging .................................................................................................................................................................................. 24
Forwarding ......................................................................................................................................................................... 25
Switching Engine ............................................................................................................................................................... 25
Media Access Controller (MAC) Operation ....................................................................................................................... 25
Inter-Packet Gap (IPG) ...................................................................................................................................................... 25
Back-off Algorithm ............................................................................................................................................................. 25
Late Collis ion ..................................................................................................................................................................... 25
Illegal Frames .................................................................................................................................................................... 25
Flow Control ...................................................................................................................................................................... 25
Half-Duplex Back Pressure ............................................................................................................................................... 28
Broadcast Storm Protection............................................................................................................................................... 28
MII Interface Operation ...................................................................................................................................................... 28
Switch MAC3/MAC4 SW3/SW4-MII Interface ................................................................................................................... 28
Switch MAC3/MAC4 SW3/SW4-RMII Interface ................................................................................................................ 30
Advanced Functionality ......................................................................................................................................................... 31
QoS Priorit y Support .......................................................................................................................................................... 31
Spanning Tree Support ..................................................................................................................................................... 32
Rapid Spanning Tree Support ........................................................................................................................................... 33
Tail Tagging Mode ............................................................................................................................................................. 34
IGMP Support .................................................................................................................................................................... 35
Port Mirroring Support ....................................................................................................................................................... 35
VLAN Support .................................................................................................................................................................... 35
Rate Limiting Support ........................................................................................................................................................ 36
Ingress Rate Limit .............................................................................................................................................................. 36
Egress Rate Limit .............................................................................................................................................................. 37
Transmit Queue Ratio Prog ram m ing ................................................................................................................................. 37
Filtering for Self-Address, Unknown Unicast/Multicast Address and Unknown VID Packet/IP Multicast ......................... 37