AM79C901AVCT datasheet(58/90 Pages) AMD

58 / 90 page

Am79C901A

PR ELI M IN AR Y

TBR1: 10BASE-T Status Register (Register 1)

The Status Register identifies the physical and Auto-

Negotiation capabilities of the local PHY. This register

is read only; a write will have no effect. See Table 42.

Table 42.

TBR1: 10BASE-T PHY Status Register (Register 1)

Note:

1. LH = Latching High, LL = Latching Low.

Bits

Name

Description

Read/Write

(Note 1)

Default

Value

(hex)

100BASE-T4

1 = 100BASE-T4 able

0 = Not 100BASE-T4 able

100BASE-X Full-Duplex

1 = 100BASE-X full-duplex able

0 = Not 100BASE-X full-duplex able

100BASE-X Half-Duplex

1 = 100BASE-X half-duplex able

0 = Not 100BASE-X half-duplex able

10 Mbps Full-Duplex

1 = 10 Mbps full-duplex able

0 = Not 10 Mbps full-duplex able

10 Mbps Half-Duplex

1 = 10 Mbps half-duplex able

0 = Not 10 Mbps half-duplex able

10:7

Reserved

Ignore when read

Management Frame Preamble

Suppression

1 = PHY can accept management (mgmt)

frames with or without preamble

0 = PHY can only accept mgmt frames with

preamble

Auto-Negotiation Complete

1 = Auto-Negotiation completed

0 = Auto-Negotiation not completed

Remote Fault

1 = Remote fault detected

0 = No remote fault detected

R, LH

(Note 1)

Auto-Negotiation Ability

1 = PHY able to auto-negotiate,

0 = PHY not able to auto-negotiate

Link Status

1 = Link is up

0 = Link is down

R, LL

(Note 1)

Jabber Detect

1 = Jabber condition detected

0 = No jabber condition detected

Extended Capability

1 = Extended register capabilities

0 = Basic register set capabilities only

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