LAN8710AI datasheet(13/82 Pages) SMSC

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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

Note 2.1

Configuration strap values are latched on power-on reset and system reset. Configuration

straps are identified by an underlined symbol name. Signals that function as configuration

straps must be augmented with an external resistor when connected to a load. Refer to

Section 3.7, "Configuration Straps," on page 36 for additional information.

Carrier Sense

/ Receive

Data Valid

(RMII Mode)

CRS_DV

VO8

This signal is asserted to indicate the receive

medium is non-idle in RMII Mode. When a

10BASE-T packet is received, CRS_DV is

asserted, but RXD[1:0] is held low until the SFD

byte (10101011) is received.

Note:

Per the RMII standard, transmitted data

is not looped back onto the receive data

pins in 10BASE-T half-duplex mode.

Collision

Detect

(MII Mode)

COL

VO8

This signal is asserted to indicate detection of a

collision condition in MII Mode.

PHY

Operating

Mode 2

Configuration

Strap

MODE2

VIS

(PU)

Combined with MODE0 and MODE1, this

configuration strap sets the default PHY mode.

See Note 2.1 for more information on

configuration straps.

Note:

Refer to Section 3.7.2, "MODE[2:0]:

Mode Configuration," on page 36 for

additional details.

Carrier Sense

(MII Mode)

CRS

VO8

(PD)

This signal indicates detection of a carrier in MII

Mode.

Table 2.2 LED Pins

NUM PINS

NAME

SYMBOL

BUFFER

TYPE

DESCRIPTION

LED 1

LED1

O12

Link activity LED Indication. This pin is driven

active when a valid link is detected and blinks

when activity is detected.

Note:

Refer to Section 3.8.1, "LEDs," on

page 39 for additional LED information.

Regulator Off

Configuration

Strap

REGOFF

(PD)

This configuration strap is used to disable the

internal 1.2V regulator. When the regulator is

disabled, external 1.2V must be supplied to

VDDCR.

When REGOFF is pulled high to VDD2A with

an external resistor, the internal regulator is

disabled.

When REGOFF is floating or pulled low, the

internal regulator is enabled (default).

See Note 2.2 for more information on

configuration straps.

Note:

Refer to Section 3.7.4, "REGOFF:

Internal +1.2V Regulator Configuration,"

on page 38 for additional details.

Table 2.1 MII/RMII Signals (continued)

NUM PINS

NAME

SYMBOL

BUFFER

TYPE

DESCRIPTION

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