AX88772 datasheet(29/42 Pages) ASIX

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AX88772

USB to 10/100 Fast Ethernet/HomePNA Controller

determine the link speed and mode.

Power down

0, RW

Power down:

1 = Power down

0 = Normal operation

Isolate

(PHYAD = 00000),

Isolate:

1 = Isolate

0 = Normal operation

Restart

auto-negotiation

0, RW / SC

Restart auto-negotiation:

1 = Restart auto-negotiation

0 = Normal operation

Duplex mode

1, RW

Duplex mode:

1 = Full duplex operation

0 = Normal operation

Collision test

0, RW

Collision test:

1 = Collision test enabled

0 = Normal operation

6:0

Reserved

X, RO

Reserved:

Write as 0, read as “don’t care”.

7.1.2

Basic Mode Status Register (BMSR)

Address 01h

Bit

Bit Name

Default

Description

100BASE-T4

0, RO / PS

100BASE-T4 capable:

0 = This PHY is not able to perform in 100BASE-T4 mode.

100BASE-TX full

duplex

1, RO / PS

100BASE-TX full-duplex capable:

1 = This PHY is able to perform in 100BASE-TX full-duplex

mode.

100BASE-TX half

duplex

1, RO / PS

100BASE-TX half-duplex capable:

1 = This PHY is able to perform in 100BASE-TX half-duplex

mode.

10BASE-T full

duplex

1, RO / PS

10BASE-T full-duplex capable:

1 = This PHY is able to perform in 10BASE-T full-duplex mode.

10BASE-T half

duplex

1, RO / PS

10BASE-T half-duplex capable:

1 = This PHY is able to perform in 10BASE-T half-duplex mode.

10:7 Reserved

0, RO

Reserved:

Write as 0, read as “don’t care”.

MF preamble

suppression

0, RO / PS

Management frame preamble suppression:

0 = This PHY will not accept management frames with preamble

suppressed.

Auto-negotiation

complete

0, RO

Auto-negotiation completion:

1 = Auto-negotiation process completed

0 = Auto-negotiation process not completed

Remote fault (Not

supported)

0, RO / LH

Remote fault:

1 = Remote fault condition detected (cleared on read or by a chip

reset)

0 = No remote fault condition detected

Auto-negotiation

ability

1, RO / PS

Auto configuration ability:

1 = This PHY is able to perform auto-negotiation.

Link status

0, RO / LL

Link status:

1 = Valid link established (100Mb/s or 10Mb/s operation)

0 = Link not established

Jabber detect

0, RO / LH

Jabber detection:

1 = Jabber condition detected

0 = No Jabber condition detected

Extended capability

1, RO / PS

Extended capability:

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