ICS1893 datasheet(76/152 Pages) ICST

76 / 152 page

ICS1893 Rev C 6/6/00

June, 2000

Chapter 8

Management Register Set

ICS1893 Data Sheet - Release

8.6

Table 8-11 lists the bits for the Auto-Negotiation Register. An STA uses this register to select the ICS1893

capabilities that it wants to advertise to its remote link partner. During the auto-negotiation process, the

ICS1893 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 ICS1893 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 ICS1893 uses the Next Page Mode functions during the auto-negotiation

process. If bit 4.15 is logic:

• Zero, then the ICS1893 indicates to its remote link partner that these features are disabled. (Although

the default value of this bit is logic zero, the ICS1893 does support the Next Page function.)

• One, then the ICS1893 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

De-

fault

Hex

4.15

Next page not supported

Next page supported

R/W

–

4.14

IEEE reserved

Always 0

N/A

–

0†

4.13

Remote fault

Locally, no faults detected

Local fault detected

R/W

–

4.12

IEEE reserved

Always 0

N/A

–

0†

4.11

IEEE reserved

Always 0

N/A

–

0†

4.10

IEEE reserved

Always 0

N/A

–

0†

4.9

100Base-T4

Always 0. (Not supported.)

N/A

–

4.8

100Base-TX, full duplex

Do not advertise ability

Advertise ability

Note 1

–

4.7

100Base-TX, half duplex

Do not advertise ability

Advertise ability

Note 1

–

4.6

10Base-T, full duplex

Do not advertise ability

Advertise ability

Note 1

–

4.5

10Base-T half duplex

Do not advertise ability

Advertise ability

Note 1

–

4.4

Selector Field bit S4

IEEE 802.3-specified default N/A

–

4.3

Selector Field bit S3

IEEE 802.3-specified default N/A

–

4.2

Selector Field bit S2

IEEE 802.3-specified default N/A

–

4.1

Selector Field bit S1

IEEE 802.3-specified default N/A

–

4.0

Selector Field bit S0

N/A

IEEE 802.3-specified

default

–

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