SMSC LAN8710 Manual De Usuario

MII/RMII 10/100 Ethernet Transceiver with HP Auto-MDIX and flexPWR

® 

 Technology in a Small Footprint

Revision 1.0 (04-15-09)

16

SMSC LAN8710/LAN8710i

RXER/

RXD4/

PHYAD0

13

IOPD

RXER – Receive Error: Asserted to indicate that an error was detected 
somewhere in the frame presently being transferred from the transceiver. 

„

The RXER signal is optional in RMII Mode.

RXD4 – 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 
RXER.

„

This signal is mux’d with PHYAD0

PHYAD0 – PHY Address Bit 0: set the SMI address of the PHY. 

„

See 

RXCLK/

PHYAD1

7

IOPD

RXCLK – Receive Clock: In MII mode, this pin is the receive clock output. 
25MHz in 100Base-TX mode. 2.5MHz in 10Base-T mode.

„

This signal is mux’d with PHYAD1

PHYAD1 – PHY Address Bit 1: set the SMI address of the transceiver. 

„

See 

RXDV

26

O8

Receive Data Valid: Indicates that recovered and decoded data is being 
presented on RXD pins. 

COL/

CRS_DV/

MODE2

15

IOPU

COL – MII Mode Collision Detect: Asserted to indicate detection of 
collision condition. 

CRS_DV – RMII Mode CRS_DV (Carrier Sense/Receive Data Valid) 
Asserted to indicate when the receive medium is non-idle. When a 10BT 
packet is received, CRS_DV is asserted, but RXD[1:0] is held low until the 
SFD byte (10101011) is received. In 10BT, half-duplex mode, transmitted 
data is not looped back onto the receive data pins, per the RMII standard. 

MODE2 – PHY Operating Mode Bit 2: set the default MODE of the PHY.

„

See 

 for information on the MODE options.

CRS

14

IOPD

Carrier Sense: Indicates detection of carrier. 

LED1/

REGOFF

3

IOPD

LED1 – Link activity LED Indication.
See 

 for a description of LED modes.

REGOFF – Regulator Off: This pin may be used to configure the internal 
1.2V regulator off. As described in 

, this pin is sampled during the 

power-on sequence to determine if the internal regulator should turn on. 
When the regulator is disabled, external 1.2V must be supplied to VDDCR.

„

When LED1/REGOFF is pulled high to VDD2A with an external resistor, the 
internal regulator is disabled. 

„

When LED1/REGOFF is floating or pulled low, the internal regulator is 
enabled (default).