LAN7430 datasheet(18/77 Pages) MICROCHIP

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LAN7430/LAN7431

DS00002631D-page 18

 2018-2019 Microchip Technology Inc.

CLK125 MHz

CLK125

VIS

Used as an input from external Ethernet PHY. This signal

may be used by the controller to generate the RGMII TX

clock.

PHY Interrupt

PHY_INT_N

VIS

Interrupt from external Ethernet PHY.

PHY Reset

PHY_RESET_N

VO12

Reset to external Ethernet PHY.

Duplex Mode

DUPLEX

VIS

Duplex Mode. This signal connects to the Duplex Mode

output from external Ethernet PHY.

When set the external Ethernet PHY is in Full Duplex

mode.

Note:

If the Ethernet PHY does not have a duplex

output signal, then it is recommended that this

signal should be tied to VDDVARIO to force full

duplex operation

Management

Interface Data

MDIO

VIS/

VO8

(PU)

This is the management data to/from an external Ether-

net PHY.

Note:

An external pull-up is required when the MII

management interface is used, to ensure that

the IDLE state of the MDIO signal is a logic

one.

Note:

An external pull-up is recommended when the

MII management interface is not used, to avoid

a floating signal.

Management

Interface Clock

MDC

VO8

This is the management clock output to an external

Ethernet PHY

External Fast Ethernet PHY MII (LAN7431 only)

Transmit Data

TXD3

TXD2

TXD1

TXD0

VO12

The MAC transmits data to the external Ethernet PHY

using these signals.

Transmit Enable

TX_EN

VO12

Indicates the presence of valid data on TXD[3:0]

Transmit Error

TX_ER

VO12

Indicates a transmit error condition.

Transmit Clock

TX_CLK

VIS

Used to transfer data from the MAC to the external Ether-

net PHY in MII mode.

100BASE-TX: 25MHz

10BASE-T: 2.5MHz

Collision Detect

COL

VIS

Asserted by external Ethernet PHY to indicate detection

of a collision condition.

Note:

Used in half-duplex mode only.

Carrier Sense

CRS

VIS

Indicates detection of carrier by external Ethernet PHY.

Note:

Used in half-duplex mode only.

Receive Data

RXD3

RXD2

RXD1

RXD0

VIS

The external Ethernet PHY transfers data to the MAC

using these signals.

Receive Data

Valid

RX_DV

VIS

Indicates that recovered and decoded data is being pre-

sented on the receive data pins.

TABLE 3-3:

PIN DESCRIPTIONS (CONTINUED)

Name

Symbol

Buffer

Type

Description

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