LAN8700 Datasheet, PDF (9/74 Pages) SMSC Corporation – ±15kV ESD Protected MII/RMII Fast-Ethernet PHY with HP Auto-MDIX and SMSC flexPWR TM in a Small Footprint

LAN8700/LAN8700i
TABLE 3-1: MII SIGNALS (CONTINUED)
Signal Name
Type
Description
RXD0/
MODE0
IOPU Receive Data 0: Bit 0 of the 4 data bits that are sent by the PHY
in the receive path.
RXD1/
MODE1
IOPU
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 46, for the MODE options
Receive Data 1: Bit 1 of the 4 data bits that are sent by the PHY
in the receive path.
RXD2/
MODE2
IOPU
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 46, for the MODE options.
Receive Data 2: Bit 2 of the 4 data bits that are sent by the PHY
in the receive path.
RXD3/
nINTSEL
IOPU
PHY Operating Mode Bit 2: set the default MODE of the PHY.
• RXD2 is not used in RMII Mode.
• See Section 5.4.9.2, "Mode Bus – MODE[2:0]," on page 46,
for the MODE options.
Receive Data 3: Bit 3 of the 4 data bits that are sent by the PHY
in the receive path.
RX_ER/
RXD4/
OPD
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 25), TXER/TXD4 is selected for operation on pin
nINT/TXER/TXD4.
• 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 Configu-
ration Resistors,” on page 25.
• See Section 4.10, "nINT/TX_ER/TXD4 Strapping," on page 24
for additional information on configuration/strapping options.
Receive Error: Asserted to indicate that an error was detected
somewhere in the frame presently being transferred from the PHY.
RX_DV
MII Receive Data 4: In Symbol Interface (5B Decoding) mode, this
signal is the MII Receive Data 4 signal, the MSB of the received
5-bit symbol code-group. Unless configured in this mode, the pin
functions as RX_ER.
Note:
This pin has an internal pull-down resistor, and must not
be high during reset. The RX_ER signal is optional in
RMII Mode.
O Receive Data Valid: Indicates that recovered and decoded data
nibbles are being presented on RXD[3:0].
Note:
This pin has an internal pull-down resistor, and must not
be high during reset. This signal is not used in RMII
Mode.
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DS00002260A-page 9