Motorola PowerQUICC II MPC8280 Series Reference Manual page 1318

Ethernet Parameter RAM
Table 36-2. Ethernet-Specific Parameter RAM (continued)
1
Offset Name Width
0xB8 MAXD1 Hword Max DMA1 length register (typically 1520 decimal). Lets the user prevent system bus
0xBA MAXD2 Hword Max DMA2 length register (typically 1520 decimal). Lets the user prevent system bus
0xBC MAXD Hword Rx maximum DMA. Internal usage
0xBE DMA_CNT Hword Rx DMA counter. Temporary down-counter used to track the frame length.
2
0xC0 OCTC Word (RMON mode only) The total number of octets of data (including those in bad packets)
2
0xC4 COLC Word (RMON mode only) The best estimate of the total number of collisions on this Ethernet
2
0xC8 BROC Word (RMON mode only) The total number of good packets received that were directed to
2
0xCC MULC Word (RMON mode only) The total number of good packets received that were directed to a
2
0xD0 USPC Word (RMON mode only) The total number of packets received that were less than 64 octets
2
0xD4 FRGC Word (RMON mode only) The total number of packets received that were less than 64 octets
2
0xD8 OSPC Word (RMON mode only) The total number of packets received that were longer than 1518
2
0xDC JBRC Word (RMON mode only) The total number of packets received that were longer than 1518
2
0xE0 P64C Word (RMON mode only) The total number of packets (including bad packets) received that
36-12
Freescale Semiconductor, Inc.
writes after a frame exceeds a specified size. The MAXD1 value is valid only if an
address match is detected. If the Ethernet controller detects an incoming Ethernet
frame larger than the user-defined value in MAXD1, the rest of the frame is discarded.
The Ethernet controller waits for the end of the frame (or until MFLR bytes have been
received) and reports the frame status and length (including the discarded bytes) in the
last RxBD. This value must be greater than 32.
writes after a frame exceeds a specified size. The value of MAXD2 is valid in
promiscuous mode when no address match is detected. If the Ethernet controller
detects an incoming Ethernet frame larger than the value in MAXD2, the rest of the
frame is discarded. The Ethernet controller waits for the end of the frame (or until
MFLR bytes are received) and reports frame status and length (including the discarded
bytes) in the last RxBD. In a monitor station, MAXD2 can be much less than MAXD1
to receive entire frames addressed to this station, but receive only the headers of all
other frames.This value must be less than MAXD1.
received on the network (excluding framing bits but including FCS octets).
segment.
the broadcast address. Note that this does not include multicast packets.
multicast address. Note that this number does not include packets directed to the
broadcast address.
(excluding framing bits but including FCS octets) and were otherwise well-formed.
long (excluding framing bits but including FCS octets) and had either a bad FCS with
an integral number of octets (FCS error) or a bad FCS with a non-integral number of
octets (alignment error). Note that it is entirely normal for etherStatsFragments to
increment because it counts both runts (which are normal occurrences due to
collisions) and noise hits.
octets (excluding framing bits but including FCS octets) and were otherwise
well-formed.
octets (excluding framing bits but including FCS octets), and had either a bad FCS with
an integral number of octets (FCS error) or a bad FCS with a non-integral number of
octets (alignment error). Note that this definition of jabber is different than the definition
in IEEE-802.3 section 8.2.1.5 (10BASE5) and section 10.3.1.4 (10BASE2). These
documents define jabber as the condition where any packet exceeds 20 ms. The
allowed range to detect jabber is between 20 ms and 150 ms.
were 64 octets long (excluding framing bits but including FCS octets).
MPC8280 PowerQUICC II Family Reference Manual
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