±15kV ESD Protected MII/RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support and flexPWR® Technology in a Small Footprint
Datasheet
Table 3.1 MII Signals (continued)
SIGNAL NAME
TYPE
DESCRIPTION
TX_CLK
O
Transmit Clock: 25MHz in 100Base-TX mode. 2.5MHz in
10Base-T mode.
Note:
Note:
This signal is not used in RMII Mode.
For proper TXCLK operation, RX_ER and RX_DV must
NOT be driven high externally on a hardware reset or
on a LAN8700 power up.
RXD0/
MODE0
IOPU
IOPU
IOPU
Receive Data 0: Bit 0 of the 4 data bits that are sent by the PHY
in the receive path.
PHY Operating Mode Bit 0: set the default MODE of the PHY.
Note:
See Section 5.4.9.2, "Mode Bus – MODE[2:0]," on
page 56, for the MODE options
RXD1/
MODE1
Receive Data 1: Bit 1 of the 4 data bits that are sent by the PHY
in the receive path.
PHY Operating Mode Bit 1: set the default MODE of the PHY.
Note:
See Section 5.4.9.2, "Mode Bus – MODE[2:0]," on
page 56, for the MODE options.
RXD2/
MODE2
Receive Data 2: Bit 2 of the 4 data bits that are sent by the PHY
in the receive path.
PHY Operating Mode Bit 2: set the default MODE of the PHY.
Notes:
RXD2 is not used in RMII Mode.
See Section 5.4.9.2, "Mode Bus – MODE[2:0]," on page 56, for
the MODE options.
RXD3/
nINTSEL
IOPU
Receive Data 3: Bit 3 of the 4 data bits that are sent by the PHY
in the receive path.
nINTSEL: On power-up or external reset, the mode of the
nINT/TXER/TXD4 pin is selected.
When RXD3/nINTSEL is floated or pulled to VDDIO, nINT is
selected for operation on pin nINT/TXER/TXD4 (default).
When RXD3/nINTSEL is pulled low to VSS through a resistor,
(see Table 4.3, “Boot Strapping Configuration Resistors,” on
page 33), TXER/TXD4 is selected for operation on pin
nINT/TXER/TXD4.
Notes:
RXD3 is not used in RMII Mode
If the nINT/TXER/TXD4 pin is configured for nINT mode, then
a pull-up resistor is needed to VDDIO on the nINT/TXER/TXD4
pin. see Table 4.3, “Boot Strapping Configuration Resistors,” on
page 33.
See Section 4.10, "nINT/TX_ER/TXD4 Strapping," on page 32
for additional information on configuration/strapping options.
SMSC LAN8700/LAN8700i
Revision 2.3 (04-12-11)
DATA1S3HEET
SMSC [ SMSC CORPORATION ]
