8101 datasheet(74/172 Pages) LSI

74 / 172 page

2-56

Functional Description

a. Bad RX packet = legal-length error, CRC error, receive FIFO overﬂow, symbol error.

Where: CRC Error is bad FCS with an integral number of octets. Alignment Error is bad FCS with

nonintegral number of octets. Symbol Error is an invalid codeword or a /V/.

b. Bad TX packet = legal-length error, transmit FIFO underﬂow.

c. Legal-length packet is between 64 and Max_Packet_Length in bytes. Preamble is not included

in length count.

d. Max_Packet_Length for the counters can be programmed to be either 1518, 1522, 1535, or

unlimited bytes. 1518 is the default for both transmit and receive.

e. The counter result is stored in two 16-bit registers. Thus, there are two register addresses for

each counter. Of the two registers for a given counter, the register with the lower value address

contains the least signiﬁcant counter bits.

f. The RMON specs explicitly states that packet and octet counters should only tabulate received

information. This is sometimes interpreted to mean both transmitted and received information

because Ethernet was originally a shared media. As such, transmit packet and octet counters are

also available in counters 18–27 and can be summed with receive packet and octet counts if

desired.

aSQETestErrors

Number of times SQE was asserted.

Equivalent to "dot3StatsSQETestError"

Use Ctr. #40

aSymbolErrorDuringCarrier

One or more symbol errors received

from a PHY during packet reception,

exclusive of collision. This counter is

only incremented once per packet,

regardless of the number

of symbol errors in that packet.

0b11100010

0b11100011

aMACControlFramesTransmitted

Valid MAC Control packets.

Equivalent to

"apauseMACCtrlFramesTransmitted"

Use Ctr. #52

aMACControlFramesReceived

Valid MAC Control packets.

Equivalent to

"apauseMACCtrlFramesReceived"

Use Ctr. #53

aUnsupportedOpcodesReceived

Valid MAC Control packets

with non-pause opcode.

0b11100100

0b11100101

apauseMACCtrlFramesTransmitted

Valid MAC Control packets

with pause opcode.

0b11100110

0b11100111

apauseMACCtrlFramesReceived

Valid MAC Control packets

with pause opcode.

0b11101000

0b11101001

1. Footnotes

Table 2.14

Counter Deﬁnition (Cont.)

Counter

Number

Counter Name

(MIB Object Name)

Counter Description

RX/TX

Deﬁnition

Size

(Bits)

Address

REGAD[7:0]

(Low/High)

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