LAN8741AI-EN datasheet(7/106 Pages) MICROCHIP

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DS00001988A-page 7

LAN8741A/LAN8741Ai

TABLE 2-1:

MII/RMII SIGNALS

Num Pins

Name

Symbol

Buffer Type

Description

Transmit

Data 0

TXD0

VIS

The MAC transmits data to the transceiver using

this signal in all modes.

Transmit

Data 1

TXD1

VIS

The MAC transmits data to the transceiver using

this signal in all modes.

Transmit

Data 2

(MII Mode)

TXD2

VIS

The MAC transmits data to the transceiver using

this signal in MII mode.

Note:

This signal must be grounded in RMII

mode.

Transmit

Data 3

(MII Mode)

TXD3

VIS

The MAC transmits data to the transceiver using

this signal in MII mode.

Note:

This signal must be grounded in RMII

mode.

Interrupt Out-

put

nINT

VOD8

(PU)

Active low interrupt output. Place an external resis-

tor pull-up to VDDIO.

Note:

Refer to Section 3.6, "Interrupt Manage-

ment" for additional details on device

interrupts.

Note:

Refer to Section 3.8.1.2, "nINTSEL and

LED2 Polarity Selection" for details on

how the nINTSEL configuration strap is

used to determine the function of this

pin.

Transmit Error

(MII Mode)

TXER

VIS

When driven high, the 4B/5B encode process sub-

stitutes the Transmit Error code-group (/H/) for the

encoded data word. This input is ignored in the

10BASE-T mode of operation. This signal is also

used in EEE mode as TXER when TXEN = 1, and

as LPI when TXEN = 0.

Note:

This signal is not used in RMII mode.

Transmit

Data 4

(MII Mode)

TXD4

VIS

(PU)

In Symbol Interface (5B decoding) mode, this sig-

nal becomes the MII Transmit Data 4 line (the MSB

of the 5-bit symbol code-group).

Note:

This signal is not used in RMII mode.

Transmit

Enable

TXEN

VIS

(PD)

Indicates that valid transmission data is present on

TXD[3:0]. In RMII mode, only TXD[1:0] provide

valid data.

Transmit Clock

(MII Mode)

TXCLK

VO8

Used to latch data from the MAC into the trans-

ceiver.

• MII (100BASE-TX): 25 MHz

• MII (10BASE-T): 2.5 MHz

Note:

This signal is not used in RMII mode.

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