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Chapter 8
Management Register Set
ICS1892, Rev. D, 2/26/01
February 26, 2001
75
ICS1892
2000-2001, Integrated Circuit Systems, Inc.
All rights reserved.
8.6
Register 4: Auto-Negotiation Register
Table 8-11
lists the bits for the Auto-Negotiation Register. An STA uses this register to select the ICS1892
capabilities that it wants to advertise to its remote link partner. During the auto-negotiation process, the
ICS1892 advertises (that is, exchanges) capability data with its remote link partner by using a pre-defined
Link Code Word. The Link Code Word is embedded in the Fast Link Pulses exchanged between PHYs,
when the ICS1892 has its Auto-Negotiation sublayer enabled. The value of the Link Control Word is
established based on the value of the bits in this register.
Note:
For an explanation of acronyms used in
Table 8-5
, see
Chapter 1, “Abbreviations and Acronyms”
.
As per the IEEE Std 802.3u, during any write operation to any bit in this register, the STA must write the default value
to all Reserved bits.
Note 1:
In Hardware mode (that is, HW/SW pin is logic zero), this bit is a Read-Only bit.
In Software mode (that is, HW/SW pin is logic one), this bit is a Command Override Write bit.
8.6.1
Next Page (bit 4.15)
This bit indicates whether the ICS1892 uses the Next Page Mode functions during the auto-negotiation
process. If bit 4.15 is logic:
Zero, then the ICS1892 indicates to its remote link partner that these features are disabled. (Although
the default value of this bit is logic zero, the ICS1892 does support the Next Page function.)
One, then the ICS1892 advertises to its remote link partner that this feature is enabled.
Table 8-11.
Auto-Negotiation Advertisement Register (register 4 [0x04])
Bit
Definition
When Bit = 0
When Bit = 1
Ac-
cess
SF
De-
fault
Hex
4.15
Next Page
Next page not supported
Next page supported
R/W
–
0
0
4.14
IEEE reserved
Always 0
N/A
CW
–
0
4.13
Remote fault
Locally, no faults detected
Local fault detected
R/W
–
0
4.12
IEEE reserved
Always 0
N/A
CW
–
0
4.11
IEEE reserved
Always 0
N/A
CW
–
0
1
4.10
IEEE reserved
Always 0
N/A
CW
–
0
4.9
100Base-T4
Always 0. (Not supported.)
N/A
CW
–
0
4.8
100Base-TX, full duplex
Do not advertise ability
Advertise ability
Note 1
–
1
4.7
100Base-TX, half duplex Do not advertise ability
Advertise ability
Note 1
–
1
E
4.6
10Base-T, full duplex
Do not advertise ability
Advertise ability
Note 1
–
1
4.5
10Base-T half duplex
Do not advertise ability
Advertise ability
Note 1
–
1
4.4
Selector Field bit S4
IEEE 802.3-specified default N/A
CW
–
0
4.3
Selector Field bit S3
IEEE 802.3-specified default N/A
CW
–
0
1
4.2
Selector Field bit S2
IEEE 802.3-specified default N/A
CW
–
0
4.1
Selector Field bit S1
IEEE 802.3-specified default N/A
CW
–
0
4.0
Selector Field bit S0
N/A
IEEE 802.3-specified
default
CW
–
1