SMSC flexpwr lan8710i Manual De Usuario
MII/RMII 10/100 Ethernet Transceiver with HP Auto-MDIX and flexPWR
®
Technology in a Small Footprint
Datasheet
SMSC LAN8710/LAN8710i
53
Revision 1.0 (04-15-09)
DATASHEET
5.3.9.2
Mode Bus – MODE[2:0]
The MODE[2:0] bus controls the configuration of the 10/100 digital block. When the nRST pin is
deasserted, the register bit values are loaded according to the MODE[2:0] pins. The 10/100 digital
block is then configured by the register bit values. When a soft reset occurs (bit 0.15) as described in
deasserted, the register bit values are loaded according to the MODE[2:0] pins. The 10/100 digital
block is then configured by the register bit values. When a soft reset occurs (bit 0.15) as described in
, the configuration of the 10/100 digital block is controlled by the register bit values, and the
MODE[2:0] pins have no affect.
The LAN8710 mode may be configured using hardware configuration as summarized in
.
The user may configure the transceiver mode by writing the SMI registers.
The MODE[2:0] hardware configuration pins are multiplexed with other signals as shown in
.
5.3.9.3
MII/RMII Mode Selection
MII or RMII mode selection is latched on the rising edge of the internal reset (nRESET) based on the
strapping of the RXD2/RMIISEL pin. The default mode is MII with the internal pull-down resistor. To
select RMII mode, pull the RXD2/RMIISEL pin high with an external resistor to VDDIO.
strapping of the RXD2/RMIISEL pin. The default mode is MII with the internal pull-down resistor. To
select RMII mode, pull the RXD2/RMIISEL pin high with an external resistor to VDDIO.
Table 5.40 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 5.41 Pin Names for Mode Bits
MODE BIT
PIN NAME
MODE[0]
RXD0/MODE0
MODE[1]
RXD1/MODE1
MODE[2]
COL/CRS_DV/MODE2