AM79C901AVCT datasheet(60/90 Pages) AMD

60 / 90 page

Am79C901A

PR ELI M IN AR Y

TBR4: 10BASE-T Auto-Negotiation Advertisement Register (Register 4)

This register contains the advertised ability of the

Am79C901A home networking device. The purpose of

this register is to advertise the technology ability to the

link partner device. See Table 45.

W hen th is re g ist er is m odifi ed, Rest ar t Au to -

Negotiation (Register 0, bit 9) must be enabled to

guarantee the change is implemented.

Table 45.

TBR4: 10BASE-T Auto-Negotiation Advertisement Register (Register 4)

Bits

Name

Description

Read/

Write

Default

Value

(hex)

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

cleared, 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 work will have the bit position for remote fault as

cleared.

R/W

12:11

Reserved

PAUSE

This bit should be set if the PAUSE capability is to be advertised.

R/W

Reserved

Full-Duplex -

100BASE-TX

This bit advertises Full-Duplex capability. When set, Full-Duplex

capability is advertised. When cleared, Full-Duplex capability is

not advertised.

Half-Duplex -

100BASE-TX

This bit advertises Half-Duplex capability for the Auto-Negotiation

process. Setting this bit advertises Half-Duplex capability.

Clearing this bit does not advertise Half-Duplex capability.

Full-Duplex -

10BASE-T

This bit advertises Full-Duplex capability. When set, Full-Duplex

capability is advertised. When cleared, Full-Duplex capability is

not advertised.

R/W

Half-Duplex -

10BASE-T

This bit advertises Half-Duplex capability for the Auto-Negotiation

process. Setting this bit advertises Half-Duplex capability.

Clearing this bit does not advertise Half-Duplex capability.

R/W

4:0

Selector Field

The 10BASE-T PHY of the Am79C901A home networking device

is an 802.3 compliant device.

R01

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