Fast Ethernet Controller
MPC8260 PowerQUICC II Family Reference Manual, Rev. 2
Freescale Semiconductor 35-3
Performs framing functions
Preamble generation and stripping
Destination address checking
CRC generation and checking
Automatic padding of short frames on transmit
Framing error (dribbling bits) handling
Full collision support
Enforces the collision (jamming and TX_ER assertion)
Truncated binary exponential backoff algorithm for random wait
Two nonaggressive backoff modes
Automatic frame retransmission (until retry limit is reached)
Automatic discard of incoming collided frames
Delay transmission of new frames for specified interframe gap
Bit rates up to 100 Mbps
Receives back-to-back frames
Detection of receive frames that are too long
Multibuffer data structure
Supports 48-bit addresses in three modes
Physical. One 48-bit address recognized or 64-bin hash table for physical addresses
Logical. 64-bin group address hash table plus broadcast address checking
Promiscuous. Receives all frames regardless of address (a CAM can be used for address
filtering)
External CAM support on system bus interfaces
Special RMON counters for monitoring network statistics
Transmitter network management and diagnostics
Lost carrier sense
— Underrun
Number of collisions exceeded the maximum allowed
Number of retries per frame
Deferred frame indication
Late collision
Receiver network management and diagnostics
CRC error indication
Nonoctet alignment error
Frame too short
Frame too long
— Overrun