Motorola MPC860 PowerQUICC User Manual page 752

Part V. The Communications Processor Module
¥ Optional heartbeat indication
¥ Transmitter network management and diagnostics
Ñ Lost carrier sense
Ñ Underrun
Ñ Number of collisions exceeded the maximum allowed
Ñ Number of retries per frame
Ñ Deferred frame indication
Ñ Late collision
¥ Receiver network management and diagnostics
Ñ CRC error indication
Ñ Nonoctet alignment error
Ñ Frame too short
Ñ Frame too long
Ñ Overrun
Ñ Busy (out of buffers)
¥ Error counters
Ñ Discarded frames (out of buffers or overrun occurred)
Ñ CRC errors
Ñ Alignment errors
¥ Internal and external loopback mode
28.3 Learning Ethernet on the MPC860
The standard SCC functionality has been enhanced on the MPC860 to support Ethernet.
First-time MPC860 users who plan to use Ethernet should Þrst read the following:
¥ Chapter 22, ÒSerial Communications Controllers,Ó describes basic operation of the
SCCs.
¥ Chapter 18, ÒCommunications Processor Module and CPM Timers,Ó describes how
the CPM issues special commands to the Ethernet channel. The dual-port RAM
loads Ethernet parameters and initializes BDs for the Ethernet channel to use.
¥ Chapter 20, ÒSDMA Channels and IDMA Emulation,Ó discusses how SDMA
channels are used to transfer data between the Ethernet channel and system memory.
¥ Section 21.3, ÒNMSI ConÞguration,Ó explains how clocks are routed to SCCs
through the bank of clocks.
¥ Chapter 28, ÒSCC Ethernet Mode,Ó should be read next.
28-4 MPC860 PowerQUICC UserÕs Manual MOTOROLA