AM79C901AVCT datasheet(65/90 Pages) AMD

65 / 90 page

Am79C901A

PR ELI M IN AR Y

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

Table 2 contains the PHY Management Extension Reg-

ister (Register 19) bits.

Table 2.

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

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

ter indicates the following: Link Status, Full-Duplex Sta-

tus, Auto-Negotiation Alert, and Speed. See Table 3.

Table 3.

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

Bits

Name

Description

Read/Write

Default Value

(hex)

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 000X1

X = Value on pin PHY_ADD (i.e., 00001 or

00011)

01/03

Bits

Name

Description

Read/Write

Default Value

(hex)

15:4

Reserved

Write as 0; Ignore on Read

3Link Status

1 = Link Status is up

0 = Link Status is down

Full-Duplex

1 = Operating in Full-Duplex mode

0 = Operating in Half-Duplex mode

Auto-Negotiation

Alert

1 = Auto-Negotiation status has changed

0 = Auto-Negotiation status unchanged

Speed

1 = Operating at 100 Mbps

0 = Operating at 10 Mbps

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