Specifications

ASIX ELECTRONICS CORPORATION
30
AX88772
USB to 10/100 Fast Ethernet/HomePNA Controller
1 = Power down
0 = Normal operation
10 Isolate (PHYAD = 00000),
RW
Isolate:
1 = Isolate
0 = Normal operation
9 Restart
auto-negotiation
0, RW / SC Restart auto-negotiation:
1 = Restart auto-negotiation
0 = Normal operation
8 Duplex mode 1, RW Duplex mode:
1 = Full duplex operation
0 = Normal operation
7 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
15 100BASE-T4 0, RO / PS 100BASE-T4 capable:
0 = This PHY is not able to perform in 100BASE-T4 mode.
14 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.
13 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.
12 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.
11 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”.
6 MF preamble
suppression
0, RO / PS Management frame preamble suppression:
0 = This PHY will not accept management frames with preamble
suppressed.
5 Auto-negotiation
complete
0, RO Auto-negotiation completion:
1 = Auto-negotiation process completed
0 = Auto-negotiation process not completed
4 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
3 Auto-negotiation
ability
1, RO / PS Auto configuration ability:
1 = This PHY is able to perform auto-negotiation.
2 Link status 0, RO / LL Link status:
1 = Valid link established (100Mb/s or 10Mb/s operation)
0 = Link not established
1 Jabber detect 0, RO / LH Jabber detection:
1 = Jabber condition detected
0 = No Jabber condition detected
0 Extended capability 1, RO / PS Extended capability:
1 = Extended register capable
0 = Basic register capable only