Broadcom BCM1250 User Manual page 10

BCM1250/BCM1125/BCM1125H
Buffer Control: TxBufCountMax and DataBufAlloc.......................................................................260
HyperTransport Resets .......................................................................................................................260
Section 9: Ethernet MACs .............................................................................................. 264
Introduction...............................................................................................................................................264
Interface Overview....................................................................................................................................265
Protocol Engine and GMII/MII ..................................................................................................................267
Ethernet Frame Format .......................................................................................................................268
Prepended Header Frame Format ......................................................................................................270
Protocol Engine Configuration.............................................................................................................271
Interface to PHY ..................................................................................................................................271
Transmitter Operation ..............................................................................................................................272
Transmitter Configuration ....................................................................................................................272
Transmit Path ......................................................................................................................................274
Receiver Operation...................................................................................................................................275
Receiver Configuration ........................................................................................................................275
Receive Path .......................................................................................................................................277
Destination Address Filtering...............................................................................................................278
Receive DMA Channel Selection ........................................................................................................281
Packet Type Identification ...................................................................................................................282
IPv4 Header Checksum.......................................................................................................................283
TCP Checksum Checking ...................................................................................................................283
Packets Dropped by the DMA Channel...............................................................................................283
Flow Control..............................................................................................................................................284
Interrupts ...................................................................................................................................................286
Standard Interrupt Signaling................................................................................................................286
Split Interrupt Signaling .......................................................................................................................286
Management Interface to PHY .................................................................................................................287
RMON Counters ........................................................................................................................................289
Packet FIFO Interfaces .............................................................................................................................292
Flow Control In Encoded Packet FIFO Modes ....................................................................................294
8-Bit Packet FIFO Operation ....................................................................................................................294
8-Bit GMII Style Packet FIFO ..............................................................................................................295
8-Bit Encoded Packet FIFO.................................................................................................................296
8-Bit SOP Flagged Packet FIFO .........................................................................................................297
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B roa dcom Co rpo rat ion
User Manual
10/21/02
Document 1250_1125-UM100CB-R