Page 1 of 77 Confidential Page 1 1
CONTENT LIST
1. GENERAL DESCRIPTION ............................................................................................................. 3
2. MAJOR FEATURES........................................................................................................................ 5
3. SYSTEM BLOCK DIAGRAM......................................................................................................... 5
4. SYSTEM DESCRIPTION................................................................................................................ 6
MACs, RMII & MII Interfaces ......................................................................................................... 6
Queue Manager................................................................................................................................ 6
Built-in ARL & External-ARL Interface.......................................................................................... 6
Register & UART Interface .............................................................................................................. 7
External-MIB & External-MIB Interface.......................................................................................... 7
5. FUNCTIONAL DESCRIPTION....................................................................................................... 8
Frame Format................................................................................................................................... 8
Start of Frame Detection................................................................................................................... 8
Frame Reception............................................................................................................................... 8
Preamble Bit Processing ................................................................................................................... 9
Destination Address Processing........................................................................................................ 9
Source Address Processing ............................................................................................................... 9
Frame Data....................................................................................................................................... 9
FCS Calculation............................................................................................................................... 9
Illegal Frame Length & Extra-long Frame...................................................................................... 10
Frame Filtering............................................................................................................................... 10
Jabber Lockup Protection................................................................................................................ 10
Excessive Collision......................................................................................................................... 10
Frame Forwarding.......................................................................................................................... 11
Frame Transmission....................................................................................................................... 11
Shared Buffer.................................................................................................................................11
Starvation Control Scheme............................................................................................................. 12
Flow Control Scheme ..................................................................................................................... 13
Port-based VLAN Support (Registers 23 & 24).............................................................................. 13
Port Trunking.................................................................................................................................14
Dumping Port.................................................................................................................................14
Spanning Tree Support................................................................................................................... 15
Queue Management........................................................................................................................ 15
PHY Management.......................................................................................................................... 15
PHY Interface.................................................................................................................................15
SRAM Interface.............................................................................................................................. 16
CPU Interface.................................................................................................................................16
ARL Interface.................................................................................................................................16
MIB Interface.................................................................................................................................16
LED Interface.................................................................................................................................16
Life Pulse ....................................................................................................................................... 17
6. INTERFACE DESCRIPTION........................................................................................................ 18
RMII Interface (RMII).................................................................................................................... 19
PHY Management Interface............................................................................................................ 19
CPU Interface.................................................................................................................................20
SRAM Interface.............................................................................................................................. 21
ARL & MIB Interfaces................................................................................................................... 22
LED Interface.................................................................................................................................23
Configuration Interface................................................................................................................... 25
Other Interface ............................................................................................................................... 26
7. REGISTER DESCRIPTION........................................................................................................... 27
INTSRC register (register 1)........................................................................................................... 28