ACD82224 Datasheet, PDF (2/77 Pages) List of Unclassifed Manufacturers – 24 Ports 10/100 Fast Ethernet Switch

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
Page 1 of 77
Confidential
Page 1