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10/100 Mbps Ethernet Controller Family Open Source Software Developer Manual 123
Physical Layer Interface
NOTE: The Auto-Negotiation Link Partner Ability Register is read only.
7.2.6 Auto-Negotiation Expansion Register: Register 6
Register 6 contains supplemental information used by the auto-negotiation process.
12:11 Technology Ability Field RO These bits are reserved. 000
10 Pause RO
This bit indicates if Pause is supported by the link
partner.
0
9 100BASE-T4
a
RO
This bit indicates if 100BASE-T4 is supported by
the link partner.
0
8
100BASE-TX Full
Duplex
a
RO
This bit indicates if 100Base-TX full duplex is
supported by the local node.
0
7 100BASE-TX
a
RO
This bit indicates if 100BASE-TX is supported by
the link partner
0
6 10BASE-T Full Duplex
a
RO
This bit indicates it 10BASE-T full duplex is
supported by the link partner.
0
5 10BASE-T
a
RO
This bit indicates if 10BASE-T is supported by the
link partner.
0
4:0 Selector Field RO
This field contains the Selector value from the link
partner.
00000
a. During normal operation, the driver (management agent) does not need to change this register value. If a certain ability is not
advertised, the respective bit in the Technology Ability field must be cleared. A bit that is not supported by the device must
not be set within this field. Otherwise, the auto-negotiation protocol will be violated.
Bit Name R / W Description Default
Bit Name R / W Description Default
15:5 Reserved RO These bits are reserved and should be set to 0. 0
4 Parallel Detection Fault RO
1 = More than one of the 10BASE-T, 100BASE-TX,
or 100BASE-T4 PMAs detects a valid link.
0 = One or zero of the 10BASE-T, 100BASE-TX, or
100BASE-T4 PMAs detects a valid link.
0
3
Link Partner Next Page
Able
RO
1 = Link partner supports Next Page.
0 = Link partner does not support Next Page.
0
2 Next Page Able RO
1 = Local device supports Next Page.
0 = Local device does not support Next Page.
0
1 Page Received RO
1 = Three identical and consecutive link code words
have been received.
0 = Three identical and consecutive link code words
have not been received.
0
0
Link Partner Auto-
Negotiation Able
RO
1 = Link partner supports auto-negotiation.
0 = Link partner does not support auto-negotiation.
0