AM79C978VCSLASHW datasheet(197/261 Pages) AMD

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Am79C978

197

TBR19: 10BASE-T PHY Management Extension

Table 76 contains the PHY Management Extension

Table 76.

TBR19: 10BASE-T PHY Management Extension Register (Register 19)

Reserved Register: 10BASE-T Configuration

This register is reserved.

Reserved Register: 10BASE-T Carrier Status

This register is reserved.

TBR24: 10BASE-T Summary Status Register

(Register 24)

The Summary Status register is a global register con-

taining status information. This register is Read/Only

and represents the most important data which a single

ister indicates the following: Link Status, Full-Duplex

Status, Auto-Negotiation Alert, and Speed. See Table

77.

Table 77.

TBR24: 10BASE-T Summary Status Register (Register 24)

Bits

Name

Description

Read/Write

Default Value

Soft Reset

15:6

Reserved

Write as 0; ignore on read

Mgmt Frame Format

1 = last management frame was

invalid (opcode error, etc.) 0 = last

management frame was valid

4-0

PHY Address

PHY Address defaults to 11110

11110

Retains

Previous Value

Bit(s)

Name

Description

Read/

Write

H/W or Soft

Reset

15-4

Reserved

Write as 0; Ignore on Read

3Link Status

1 = Link Status is up

0 = Link Status is down

R/O

Full-Duplex

Operating in Full-Duplex mode

Operating in Half-Duplex mode

R/O

AutoNEG

Alert

1 = AutoNEG status has changed

0 = AutoNEG status unchanged

R/O

Speed

1 = Operating at 100 Mbps

0 = Operating at 10 Mbps

R/O

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