76
Am79C976
8/01/00
P R E L I M I N A R Y
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Table 8 describes the statistics counters associated
with the transmitter and lists the MIB objects that these
counters support.
In this table the Offset column gives the offset with re-
spect to the value stored in the read-only MIB Offset
register, which is located at offset 28h in the memory
address space allocated to the Am79C976 device. The
actual address of a particular counter is the sum of the
following quantities:
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Table 8. Transmit Statistics Counters
48
RcvPkts128to255Octets
RMON etherStatsPkts128to255Octets
The total number of packets (including
error packets) that are 128 bytes to 255
bytes long, inclusive.
4C
RcvPkts256to511Octets
RMON etherStatsPkts256to511Octets
The total number of packets (including
error packets) that are 256 bytes to 511
bytes long, inclusive.
50
RcvPkts512to1023Octets
RMON etherStatsPkts512to1023Octets
The total number of packets (including
error packets) that are 512 bytes to 1023
bytes long, inclusive
54
RcvPkts1024to1518Octets
RMON
etherStatsPkts1024to1518Octets
The total number of packets (including
error packets) that are 1024 bytes to 1518
(1522 when VLAN set) bytes long,
inclusive.
58
RcvUnsupportedOpcodes
802.3x an
UnsupportedOpcodesReceived
The total number of valid frames received
with (1) a lengthOrType field value equal to
8808h and (2) an opcode not equal to 1.
5C
RcvSymbolErrors
The number of times when valid carrier
(CRS) was present and there was at least
one occurrence of an invalid data symbol
(RX_ER). This counter is incremented
only once per valid carrier event (once per
frame), and if a collision is present, this
counter must not be incremented.
Offset (hex)
Receive Counter Name
MIB Object Supported
Description of Counter/Comments
Offset
(hex)
Transmit Counter Name
MIB Object Supported
Description of Counter/Comments
60
XmtUnderrunPkts
RMON etherStatsDropEvents
RMON etherHistoryDropEvents
MIB-II ifOutDiscards
E-like
dot3StatsInternalMacTranmsitErrors
The number of times a packet was dropped
due to transmit FIFO underrun.
64
XmtOctets
RMON etherStatsOctets
RMON etherHistoryOctets
RMON hostOutOctets
RMON hostTimeOutOctets
MIB-II IfOutOctets
The total number of octets of data
transmitted. This does not include the
preamble but does include the FCS bits. The
XmtOctets counter is incremented whenever
the transmitter transmits an octet.