AM79C975VCW datasheet(276/304 Pages) AMD

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276

Am79C973/Am79C975

P R E L I M INARY

Auto-Negotiation Advertisement

The purpose of this register is to advertise the technol-

ogy ability to the link partner device. See Table C-73.

When this register is modified, Restart Auto-Negotia-

tion (Register 0, bit 9) must be enabled to guarantee

the change is implemented.

Table 73. Auto-Negotiation Advertisement Register (Register 4)

Technology Ability Field Bit Assignments

The technology bit field consists of bits A0-A7 in the

IEEE 802.3 Selector Base Page. Table C-74 summa-

rizes the bit assignments.

Table 74. Technology Ability Field Bit

Assignments

Bit(s)

Name

Description

Read/

Write

When set, the device wishes to engage in next page exchange. If clear, the

device does not wish to engage in next page exchange.

R/W

Reserved

Remote Fault

When set, a remote fault bit is inserted into the base link code word during

the Auto Negotiation process. When cleared, the base link code word will

have the bit position for remote fault as cleared.

R/W

12:5

Technology Ability

Link partner technology ability field.

4:0

Selector Field

Link partner selector field.

Bit

Technology

10BASE-T

10BASE-T Full Duplex

100BASE-TX

100BASE-TX Full Duplex

100BASE-T4

Reserved for future technology

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