DP83840A datasheet(47/89 Pages) NSC

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4.0 Registers (Continued)

National Semiconductor

Version A

4.6 AUTO-NEGOTIATION ADVERTISEMENT REGISTER (ANAR)

Address 04h

This register contains the advertised abilities of this DP83840A device as they will be transmitted to its Link Partner

during Auto-Negotiation.

Bit

Bit Name

Default

Description

0, RO/P

NEXT PAGE INDICATION:

0 = Not Next Page able

1 = Next Page able

The DP83840A is not Next Page capable so this bit is permanently set

to 0.

ACK

0, RO/P

ACKNOWLEDGE:

1 = Reception of Link Partner ability data acknowledged

0 = Not acknowledged

The DP83840A's Auto-Negotiation state machine will automatically

control this bit in the outgoing FLP bursts, setting it at the appropriate

time during the Auto-Negotiation process. Software should not attempt

to write to this bit.

0, RW

REMOTE FAULT:

1 = Advertises that this device has detected a Remote Fault

0 = No Remote Fault detected

12:10

Reserved

X, RW

RESERVED: Write as 0, read as don't care.

0, RO/P

100BASE-T4 SUPPORT:

1 =100BASE-T4 is supported by the local device

0 =100BASE-T4 not supported

The DP83840A does not support 100BASE-T4 so this bit is permanently

set to 0.

TX_FD

1, RW

100BASE-TX FULL DUPLEX SUPPORT:

1 = 100BASE-TX Full Duplex is supported by the local device

0 = 100BASE-TX Full Duplex not supported

1, RW

100BASE-TX SUPPORT:

1 = 100BASE-TX is supported by the local device

0 = 100BASE-TX not supported

10_FD

1, RW

10BASE-T FULL DUPLEX SUPPORT:

1 = 10BASE-T Full Duplex is supported by the local device

0 = 10BASE-T Full Duplex not supported

1, RW

10BASE-T SUPPORT:

1 = 10BASE-T is supported by the local device

0 = 10BASE-T not supported

4:0

Selector

<00001>,

PROTOCOL SELECTION BITS: These bits contain the binary encoded

protocol selector supported by this node.

<00001> indicates that this device supports IEEE 802.3 CSMA/CD

DP83840A Datasheet(PDF) 47 Page - National Semiconductor (TI)

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