AM79C983A datasheet(33/60 Pages) AMD

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Am79C983A

PRELIMINARY

TPn/SPn

Link Test state unchanged

Link Test state changed

Loopback Error Change Interrupt

Address:

1110 0011

If a port is connected to a MAU which does not loop-

back data from DO to DI during transmission that port

has a loopback error. For the error to be detected, the

network needs to be active and a packet transmitted

from the port. The corresponding bit is set to 1 when

the loopback error condition changes.

Pn/AUI/RAUI

No loopback error change

Loopback error change

Polarity Change Interrupt

Address:

1110 0100

The corresponding bit is set to 1 if the polarity of the

connected port is switched.

TPn/SPn

Polarity unchanged

Polarity changed

SQE Test Error Change Interrupt

Address:

1110 0101

If a port is connected to a MAU with SQE Test enabled

that port has an SQE Test Error. For the error to be de-

tected, the network needs to be active and a packet

must be transmitted from the port. The corresponding

bit on the register is set when the port changes from an

error state to a non-error state or from a non-error state

to an error state.

Pn/AUI/RAUI

No SQE Test Error change

SQE Test Error change

Source Address Changed Interrupt

Address:

1110 0110

The corresponding bit in the register is set when the

source address of the incoming data packet matches

neither the Last Source Address Register nor the Pre-

ferred Source Address Register associated with the

port. The incoming packet must be an error-free packet.

Pn/AUI/RAUI/EP

No change

Source address changed on

the incoming port

Intruder Interrupt

Address:

1110 0111

A bit on the Intruder Interrupt Register is set when the

source address of an error-free incoming packet does not

match the corresponding Preferred Source Address Reg-

ister. The incoming packet must be an error-free packet.

Note: The Preferred Address attribute is programma-

ble and can be used to store the expected Node ID for

a port. If the appropriate interrupt is also enabled, then

a Source Address Changed can be used to alert the

network manager of an unauthorized access. This is

particularly useful for segments that are supposed to

be connected to a single station.

Pn/AUI/RAUI/EP

Intruder

status

port unchanged

Intruder

status

port changed

Source Address Match Interrupt

Address:

1110 1000

When the source address of an incoming packet from

any port matches the Source Address Match Register,

the appropriate bit is set. The received packet must be

an error-free packet.

RAUI

AUI P11 P10 P9

D Port Read

Byte 0

Byte 1

LSB

MSB

TP7 TP6 TP5 TP4 TP3 TP2 TP1 TP0

SP3 SP2 SP1 SP0 TP11 TP10 TP9 TP8

Byte 0

Byte 1

D Port Read

LSB

MSB

RAUI

AUI P11 P10 P9

D Port Read

Byte 0

Byte 1

LSB

MSB

RAUI

AUI P11 P10 P9

D Port Read

Byte 0

Byte 1

LSB

MSB

RAUI

AUI P11 P10 P9

D Port Read

Byte 0

Byte 1

LSB

MSB

RAUI

AUI P11 P10 P9

D Port Read

Byte 0

Byte 1

LSB

MSB

AM79C983A Datasheet(PDF) 33 Page - Advanced Micro Devices

AM79C983A Datasheet(HTML) 33 Page - Advanced Micro Devices

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