MPC8280 datasheet(1245/1386 Pages) FREESCALE

1245 / 1386 page

Fast Ethernet Controller

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

Freescale Semiconductor

36-11

0xBA

MAXD2

Hword Max DMA2 length register (typically 1520 decimal). Lets the user prevent system bus

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.

0xBC

MAXD

Hword Rx maximum DMA. Internal usage

0xBE

DMA_CNT

Hword Rx DMA counter. Temporary down-counter used to track the frame length.

0xC0

OCTC 2

Word

(RMON mode only) The total number of octets of data (including those in bad packets)

received on the network (excluding framing bits but including FCS octets).

0xC4

COLC 2

Word

(RMON mode only) The best estimate of the total number of collisions on this Ethernet

segment.

0xC8

BROC 2

Word

(RMON mode only) The total number of good packets received that were directed to

the broadcast address. Note that this does not include multicast packets.

0xCC

MULC 2

Word

(RMON mode only) The total number of good packets received that were directed to

a multicast address. Note that this number does not include packets directed to the

broadcast address.

0xD0

USPC 2

Word

(RMON mode only) The total number of packets received that were less than 64 octets

(excluding framing bits but including FCS octets) and were otherwise well-formed.

0xD4

FRGC 2

Word

(RMON mode only) The total number of packets received that were less than 64 octets

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.

0xD8

OSPC 2

Word

(RMON mode only) The total number of packets received that were longer than 1518

octets (excluding framing bits but including FCS octets) and were otherwise

well-formed.

0xDC

JBRC 2

Word

(RMON mode only) The total number of packets received that were longer than 1518

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.

0xE0

P64C 2

Word

(RMON mode only) The total number of packets (including bad packets) received that

were 64 octets long (excluding framing bits but including FCS octets).

0xE4

P65C 2

Word

(RMON mode only) The total number of packets (including bad packets) received that

were between 65 and 127 octets long inclusive (excluding framing bits but including

FCS octets).

Table 36-2. Ethernet-Specific Parameter RAM (continued)

Offset1

Name

Width

Description

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