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Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support
Datasheet
SMSC LAN8720/LAN8720i 47 Revision 1.0 (05-28-09)
DATASHEET
29.1 INT1 1 = Auto-Negotiation Page Received
0 = not source of interrupt
RO/
LH
X
29.0 Reserved Ignore on read. RO/
LH
0
Table 5.35 Register 30 - Interrupt Mask
ADDRESS NAME DESCRIPTION MODE DEFAULT
30.15:8 Reserved Write as 0; ignore on read. RO 0
30.7:1 Mask Bits 1 = interrupt source is enabled
0 = interrupt source is masked
RW 0
30.0 Reserved Write as 0; ignore on read RO 0
Table 5.36 Register 31 - PHY Special Control/Status
ADDRESS NAME DESCRIPTION MODE DEFAULT
31.15:13 Reserved Write as 0, ignore on read. RW 0
31.12 Autodone Auto-negotiation done indication:
0 = Auto-negotiation is not done or disabled (or not
active)
1 = Auto-negotiation is done
Note: This is a duplicate of register 1.5, however
reads to register 31 do not clear status bits.
RO 0
31.11:10 Reserved Write as 0, ignore on Read. RW XX
31.9:7 GPO[2:0] General Purpose Output connected to signals
GPO[2:0]
RW 0
31.6 Enable 4B5B 0 = Bypass encoder/decoder.
1 = enable 4B5B encoding/decoding.
MAC Interface must be configured in MII mode.
RW 1
31.5 Reserved Write as 0, ignore on Read. RW 0
31.4:2 Speed Indication HCDSPEED value:
[001]=10Mbps Half-duplex
[101]=10Mbps Full-duplex
[010]=100Base-TX Half-duplex
[110]=100Base-TX Full-duplex
RO XXX
31.1 Reserved Write as 0; ignore on Read RW 0
31.0 Scramble Disable 0 = enable data scrambling
1 = disable data scrambling,
RW 0
Table 5.34 Register 29 - Interrupt Source Flags (continued)
ADDRESS NAME DESCRIPTION MODE DEFAULT