Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support
Datasheet
Table 5.22 Register 1 - Basic Status (continued)
ADDRESS
NAME
DESCRIPTION
MODE
DEFAULT
1.4
Remote Fault
1 = remote fault condition detected
0 = no remote fault
RO/
LH
0
1.3
1.2
1.1
1.0
Auto-Negotiate
Ability
1 = able to perform auto-negotiation function
0 = unable to perform auto-negotiation function
RO
1
X
X
1
Link Status
1 = link is up,
0 = link is down
RO/
LL
Jabber Detect
1 = jabber condition detected
0 = no jabber condition detected
RO/
LH
Extended
Capabilities
1 = supports extended capabilities registers
0 = does not support extended capabilities registers
RO
Table 5.23 Register 2 - PHY Identifier 1
DESCRIPTION
ADDRESS
NAME
MODE DEFAULT
RW 0007h
2.15:0
PHY ID Number
Assigned to the 3rd through 18th bits of the
Organizationally Unique Identifier (OUI), respectively.
OUI=00800Fh
Table 5.24 Register 3 - PHY Identifier 2
DESCRIPTION
ADDRESS
NAME
MODE DEFAULT
3.15:10
3.9:4
PHY ID Number
Model Number
Assigned to the 19th through 24th bits of the OUI.
Six-bit manufacturer’s model number.
RW
RW
RW
30h
0Fh
3.3:0
Revision Number
Four-bit manufacturer’s revision number.
DEVICE
REV
Table 5.25 Register 4 - Auto Negotiation Advertisement
DESCRIPTION
ADDRESS
NAME
MODE
DEFAULT
4.15
Next Page
1 = next page capable,
RO
0
0 = no next page ability
This Phy does not support next page ability.
4.14
4.13
Reserved
RO
0
0
Remote Fault
1 = remote fault detected,
0 = no remote fault
RW
4.12
Reserved
4.11:10
Pause Operation
00 = No PAUSE
01= Symmetric PAUSE
R/W
00
10= Asymmetric PAUSE toward link partner
11 = Both Symmetric PAUSE and Asymmetric
PAUSE toward local device
Revision 1.0 (05-28-09)
SMSC LAN8720/LAN8720i
DATA4S2HEET
SMSC [ SMSC CORPORATION ]
