LAN8710AI datasheet(37/82 Pages) MICROCHIP

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Small Footprint MII/RMII 10/100 Ethernet Transceiver with HP Auto-MDIX and flexPWR® Technology

Datasheet

SMSC LAN8710A/LAN8710Ai

Revision 1.4 (08-23-12)

DATASHEET

The MODE[2:0] hardware configuration pins are multiplexed with other signals as shown in Table 3.7.

3.7.3

RMIISEL: MII/RMII Mode Configuration

MII or RMII mode selection is latched on the rising edge of the internal reset (nRST) based on the

strapping of the RMIISEL configuration strap. The default mode is MII (via the internal pull-down

resistor). To select RMII mode, pull the RMIISEL configuration strap high with an external resistor to

VDDIO.

When the nRST pin is deasserted, the MIIMODE bit of the Special Modes Register is loaded according

to the RMIISEL configuration strap. The mode is reflected in the MIIMODE bit of the Special Modes

Refer to Section 3.4, "MAC Interface," on page 30 for additional information on MII and RMII modes.

Table 3.6 MODE[2:0] Bus

MODE[2:0]

MODE DEFINITIONS

DEFAULT REGISTER BIT VALUES

[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.

1000

N/A

011

100Base-TX Full Duplex. Auto-negotiation disabled.

CRS is active during Receive.

1001

N/A

100

100Base-TX Half Duplex is advertised. Auto-

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.

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

other value and a soft reset must be issued.

N/A

111

All capable. Auto-negotiation enabled.

X10X

1111

Table 3.7 Pin Names for Mode Bits

MODE BIT

PIN NAME

MODE[0]

RXD0/MODE0

MODE[1]

RXD1/MODE1

MODE[2]

COL/CRS_DV/MODE2

LAN8710AI 数据表(PDF) 37 Page - Microchip Technology

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