Information

Enhanced Three-Speed Ethernet Controllers
MPC8308 PowerQUICC II Pro Processor Reference Manual, Rev. 1
16-130 Freescale Semiconductor
The fields of the received preamble sequence are described in Table 16-129. Should the received preamble
be shorter than the 7-octet sequence defined by IEEE Std. 802.3, initial bytes of the received preamble
sequence hold undefined values. The standard start of frame delimiter (0xD5) is always omitted.
16.6.2.6 RMON Support
Using promiscuous mode, the eTSEC can automatically gather network statistics required for remote
network interface monitoring. The RMON MIB group 1, RMON MIB group 2, RMON MIB group 3,
RMON MIB group 9, RMON MIB2, and the IEEE 802.3 Ethernet MIB are supported. For RMON
statistics and their corresponding counters, see the memory map.
16.6.2.7 Frame Recognition
The Ethernet controller performs frame recognition using destination address (DA) recognition. A frame
can be rejected or accepted based on the outcome.
Table 16-129. Received Preamble Field Descriptions
Bytes Bits Name Description
0–1 0–7 PreOct0 Octet #0 of received preamble. This is the first octet of preamble received.
8–15 PreOct1 Octet #1 of received preamble. This is the second octet of preamble received.
2–3 0–7 PreOct2 Octet #2 of received preamble. This is the third octet of preamble received.
8–15 PreOct3 Octet #3 of received preamble. This is the fourth octet of preamble received.
4–5 0–7 PreOct4 Octet #4 of received preamble. This is the fifth octet of preamble received.
8–15 PreOct5 Octet #5 of received preamble. This is the sixth octet of preamble received.
6–7 0–7 PreOct6 Octet #6 of received preamble. This is the seventh octet of preamble received. The last octet (the
start of frame delimiter) is discarded.
8–15 — Reserved