4.0 Registers (Continued)
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
15
NP
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.
14
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.
13
RF
0, RW
REMOTE FAULT:
1 = Advertises that this device has detected a Remote Fault
0 = No Remote Fault detected
12:10
9
Reserved
T4
X, RW
RESERVED: Write as 0, read as don't care.
100BASE-T4 SUPPORT:
0, RO/P
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.
8
7
TX_FD
TX
1, RW
1, RW
1, RW
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
100BASE-TX SUPPORT:
1 = 100BASE-TX is supported by the local device
0 = 100BASE-TX not supported
6
10_FD
10
10BASE-T FULL DUPLEX SUPPORT:
1 = 10BASE-T Full Duplex is supported by the local device
0 = 10BASE-T Full Duplex not supported
10BASE-T SUPPORT:
5
1 = 10BASE-T is supported by the local device
0 = 10BASE-T not supported
4:0
Selector
<00001>,
RW
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
Version A
National Semiconductor
47
TI [ TEXAS INSTRUMENTS ]
