AM79C983A datasheet(40/60 Pages) AMD

40 / 60 page

Am79C983A

PRELIMINARY

etherStatsBroadcastPkts

Address:

1110 0010

The value in this register represents the total number

of valid packets received that were addressed to a

broadcast address.

etherStatsMulticastPkts

Address:

1110 0011

The value in this register represents the total number

of valid packets received that were addressed to a

multicast address.

etherStatsCRCAlignErrors

Address:

1110 0100

The value in this register represents the total number of

packets received that were between 64 and 1518 octets,

inclusive, and had either FCS errors or alignment errors.

etherStatsUndersizePkts

Address:

1110 0101

The value in this register represents the total number of

packets received that were less than 64 octets long, but

were otherwise error free.

etherStatsOversizePkts

Address:

1110 0110

The value in this register represents the total number of

packets received that were greater than 1518 octets

long, but were otherwise error free.

etherStatsFragments

Address:

1110 0111

The value in this register represents the total number of

packets received that were less than 64 octets long, not

including the preamble or SFD, and had either an FCS

error or an alignment error.

etherStatsJabbers

Address:

1110 1000

The value in this register represents the total number of

packets that were greater than 1518 octets long and

had either FCS errors or alignment errors.

Note: This differs from the IEEE deﬁnition of Jabber.

etherStatsCollisions

Address:

1110 1001

The value in this register represents the total number of

collisions on the IMR2 device.

etherStats64Octets

Address:

1110 1010

The value in this register represents the total number of

packets (including error packets) that were 64 octets long.

etherStats65to127Octets

Address:

1110 1011

The value in this register represents the total number of

packets (including error packets) that were 65 octets to

127 octets long inclusive.

etherStats128to255Octets

Address:

1110 1100

The value in this register represents the total number of

packets (including error packets) that were 128 octets

to 255 octets long inclusive.

etherStats256to511Octets

Address:

1110 1101

The value in this register represents the total number of

packets (including error packets) that were 256 octets

to 511 octets long inclusive.

etherStats512to1023Octets

Address:

1110 1110

The value in this register represents the total number of

packets (including error packets) that were 512 octets

to 1023 octets long inclusive.

etherStats1024to1518Octets

Address:

1110 1111

The value in this register represents the total number of

packets (including error packets) that were 1024 octets

to 1518 octets long inclusive.

Activity

Address:

1111 0000

The value in this register represents the total number of

octets that were active on the IMR2 device.

These registers control packet compression and error

sampling. The Management Support Registers can be

accessed by writing 0000 0111 to the C Register and

then writing the register address to the C Register.

Device ID

Address:

1110 0000

The Device ID Register is a read/write register. It is an

8-bit register and contains the assigned ID number of

the IMR2 device. This number is transmitted as part of

the tag ﬁeld by the Packet Report Port.

Sample Error Status

Address:

1110 0010

Sample Error Status gives statistical data on packets that

have errors. It is a 4-deep 8-byte FIFO. Each read re-

quires accessing the data register eight times. The ac-

cess can jump to the next level of the FIFO in the middle

of a read by writing any value to the node processor port

with the C/D pin HIGH. If the node processor port is ac-

cessed (with the C/D pin LOW) after the last byte is read,

AM79C983A Datasheet(PDF) 40 Page - Advanced Micro Devices

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