AM79C875KC datasheet(28/48 Pages) AMD

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Am79C875

PHY Identifier 1 Register (Register 2)

Table 9.

Reg

Bit

Name

Description

Read/

Write

Default

15:0

OUI

Composed of the 3rd through 18th bits of the Organizationally

Unique Identifier (OUI), respectively.

0022(H)

PHY Identifier 1 Register (Register 2)

PHY Identifier 2 Register (Register 3)

Table 10.

Reg

Bit

Name

Description

Read/

Write

Default

15:10

OUI

Assigned to the 19th through 24th bits of the OUI.

010101

9:4

Model Number

Six bit manufacturer’s model number.

010100

3:0

Revision Number

Four bit manufacturer’s revision number. 0001 stands for

Rev. A, etc.

0001

PHY Identifier 2 Register (Register 3)

Auto-Negotiation Advertisement Register (Register 4)

Table 11.

Reg

Bit

Name

Description

Read/

Write

Default

1 = Next Page enabled.

0 = Next Page disabled.

Acknowledge

This bit will be set internally after receiving 3 consecutive and

consistent FLP bursts.

Remote Fault

1 = Remote fault supported.

0 = No remote fault.

12:11

Reserved

Write as 0, ignore when read.

FDFC

Full Duplex Flow Control.

1 = Advertise that the DTE(MAC) has implemented both the

optional MAC control sublayer and the pause function as

specified in clause 31 and annex 31 B of 802.3u.

0 = No MAC-based full duplex flow control.

100BASE-T4

The NetPHY™ 4LP device does not support 100BASE-T4

function, i.e., this bit ties to zero.

100BASE-TX

Full Duplex

1 = 100BASE-TX with full duplex.

0 = No 100BASE-TX full duplex ability.

Default is set by Register 1.14.

Set by

DPLX pin

100BASE-TX

Half Duplex

1 = 100BASE-TX with half duplex.

0 = No 100BASE-TX half duplex capability.

Default is set by Register 1.13.

10BASE-T

Full Duplex

1 = 10 Mbps with full duplex.

0 = No 10Mbps full duplex capability.

Default is set by Register 1.12.

Set by

DPLX pin

10BASE-T

Half Duplex

1 = 10 Mbps with half duplex.

0 = No 10 Mbps half duplex capability

Default is set by Register 1.11.

4:0

Selector Field

[00001] = IEEE 802.3

00001

Auto-Negotiation Advertisement Register (Register 4)

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