LAN8740A Datasheet, PDF(7/136 Page) Microchip Technology – Small Footprint MII/RMII 10/100 Energy Efficient Ethernet Transceiver with HP Auto-MDIX and flexPWR® Technology

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LAN8740A Datasheet, PDF (7/136 Pages) Microchip Technology – Small Footprint MII/RMII 10/100 Energy Efficient Ethernet Transceiver with HP Auto-MDIX and flexPWR® Technology

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LAN8740A/LAN8740Ai

TABLE 2-1:

Num Pins

MII/RMII SIGNALS

Name

Transmit

Data 0

Transmit

Data 1

Transmit

Data 2

(MII Mode)

Symbol

TXD0

TXD1

TXD2

Transmit

TXD3

Data 3

(MII Mode)

Interrupt Out-

nINT

put

Transmit Error

(MII Mode)

TXER

Transmit

Data 4

(MII Mode)

TXD4

Transmit

TXEN

Enable

Transmit Clock

TXCLK

(MII Mode)

Buffer Type

Description

VIS

The MAC transmits data to the transceiver using

this signal in all modes.

VIS

The MAC transmits data to the transceiver using

this signal in all modes.

VIS

The MAC transmits data to the transceiver using

this signal in MII mode.

Note: This signal must be grounded in RMII

mode.

VIS

The MAC transmits data to the transceiver using

this signal in MII mode.

VOD8

(PU)

Note: This signal must be grounded in RMII

mode.

Active low interrupt output. Place an external resis-

tor pull-up to VDDIO.

Note:

The nINT signal can be optionally con-

figured to output on the LED1 or LED2

pins. Refer to Section 3.6, "Interrupt

Management" for additional details on

device interrupts.

Note:

Refer to Section 3.8.1.6, "nINTSEL and

LED2 Polarity Selection" for details on

how the nINTSEL configuration strap is

used to determine the function of this

pin.

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.

VIS

(PU)

Note: This signal is not used in RMII mode.

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).

VIS

(PD)

VO8

Note: This signal is not used in RMII mode.

Indicates that valid transmission data is present on

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

valid data.

Used to latch data from the MAC into the trans-

ceiver.

â¢ MII (100BASE-TX): 25 MHz

â¢ MII (10BASE-T): 2.5 MHz

Note: This signal is not used in RMII mode.

ï£ 2013-2015 Microchip Technology Inc.

DS00001987A-page 7

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