lan8720 Standard Microsystems Corp., lan8720 Datasheet - Page 54

• Manufacturer Part Number: lan8720
• Description: Small Footprint Rmii 10/100 Ethernet Transceiver With Hp Auto-mdix Support
• Manufacturer: Standard Microsystems Corp.

Revision 1.0 (04-15-09)
MODE[2:0]
000
001
010
100
101
011
110
111
The MODE[2:0] hardware configuration pins are multiplexed with other signals as shown in
10Base-T Half Duplex. Auto-negotiation disabled.
10Base-T Full Duplex. Auto-negotiation disabled.
100Base-TX Half Duplex. Auto-negotiation
disabled.
CRS is active during Transmit & Receive.
100Base-TX Full Duplex. Auto-negotiation disabled.
CRS is active during Receive.
100Base-TX Half Duplex is advertised. Auto-
negotiation enabled.
CRS is active during Transmit & Receive.
Repeater mode. Auto-negotiation enabled.
100Base-TX Half Duplex is advertised.
CRS is active during Receive.
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
to some other value and a soft reset must be
issued.
All capable. Auto-negotiation enabled.
MODE DEFINITIONS
Table
Table 5.40 Pin Names for Mode Bits
MODE BIT
MODE[0]
MODE[1]
MODE[2]
Table 5.39 MODE[2:0] Bus
5.30) must be configured
DATASHEET
54
CRS_DV/MODE2
RXD0/MODE0
RXD1/MODE1
PIN NAME
Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support
DEFAULT REGISTER BIT VALUES
REGISTER 0
[13,12,10,8]
X10X
0000
0001
1000
1001
1100
1100
N/A
SMSC LAN8720/LAN8720i
REGISTER 4
[8,7,6,5]
0100
0100
1111
N/A
N/A
N/A
N/A
N/A
Table
Datasheet
5.40.