SMSC LAN8720i User Manual
Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support
Datasheet
Revision 1.0 (05-28-09)
54
SMSC LAN8720/LAN8720i
DATASHEET
The MODE[2:0] hardware configuration pins are multiplexed with other signals as shown in
.
Table 5.39 MODE[2:0] Bus
MODE[2:0]
MODE DEFINITIONS
DEFAULT REGISTER BIT VALUES
REGISTER 0
REGISTER 4
[13,12,10,8]
[8,7,6,5]
000
10Base-T Half Duplex. Auto-negotiation disabled.
0000
N/A
001
10Base-T Full Duplex. Auto-negotiation disabled.
0001
N/A
010
100Base-TX Half Duplex. Auto-negotiation
disabled.
CRS is active during Transmit & Receive.
disabled.
CRS is active during Transmit & Receive.
1000
N/A
011
100Base-TX Full Duplex. Auto-negotiation disabled.
CRS is active during Receive.
CRS is active during Receive.
1001
N/A
100
100Base-TX Half Duplex is advertised. Auto-
negotiation enabled.
CRS is active during Transmit & Receive.
negotiation enabled.
CRS is active during Transmit & Receive.
1100
0100
101
Repeater mode. Auto-negotiation enabled.
100Base-TX Half Duplex is advertised.
CRS is active during Receive.
100Base-TX Half Duplex is advertised.
CRS is active during Receive.
1100
0100
110
Power Down mode. In this mode the transceiver will
wake-up in Power-Down mode. The transceiver
cannot be used when the MODE[2:0] bits are set to
this mode. To exit this mode, the MODE bits in
Register 18.7:5(see
wake-up in Power-Down mode. The transceiver
cannot be used when the MODE[2:0] bits are set to
this mode. To exit this mode, the MODE bits in
Register 18.7:5(see
) must be configured
to some other value and a soft reset must be
issued.
issued.
N/A
N/A
111
All capable. Auto-negotiation enabled.
X10X
1111
Table 5.40 Pin Names for Mode Bits
MODE BIT
PIN NAME
MODE[0]
RXD0/MODE0
MODE[1]
RXD1/MODE1
MODE[2]
CRS_DV/MODE2