Freescale Semiconductor MPC8260 User Manual
Page 787
SCC Ethernet Mode
MPC8260 PowerQUICC II Family Reference Manual, Rev. 2
Freescale Semiconductor
25-3
— Two nonaggressive backoff modes
— Automatic frame retransmission (until the attempt limit is reached)
— Automatic discard of incoming collided frames
— Delay transmission of new frames for specified interframe gap
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Maximum 10 Mbps bit rate
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Optional full-duplex support
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Back-to-back frame reception
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Detection of receive frames that are too long
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Multibuffer data structure
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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 addresses, but discards frame if REJECT is asserted
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External content-addressable memory (CAM) support on serial bus interfaces
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Up to eight parallel I/O pins can be sampled and appended to any frame
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Optional heartbeat indication
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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
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Receiver network management and diagnostics
— CRC error indication
— Nonoctet alignment error
— Frame too short
— Frame too long
— Overrun
— Busy (out of buffers)
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Error counters
— Discarded frames (out of buffers or overrun occurred)
— CRC errors
— Alignment errors
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Internal and external loopback mode