LAN8700 datasheet(12/74 Pages) MICROCHIP

12 / 74 page

LAN8700/LAN8700i

DS00002260A-page 12

 2007-2016 Microchip Technology Inc.

TABLE 3-5:

GENERAL SIGNALS

Signal Name

Type

Description

nINT/

TX_ER/

TXD4

IOPU

LAN Interrupt – Active Low output. Place an external resistor (see

Table 4-3, “Boot Strapping Configuration Resistors,” on page 25)

pull-up to VCC 3.3V.

• This signal is mux’d with TXER/TXD4

• See Section 4.10, "nINT/TX_ER/TXD4 Strapping," on page 24

for additional details on Strapping options.

nRST

External Reset – input of the system reset. This signal is active

LOW. When this pin is deasserted, the mode register bits are

loaded from the mode pins as described in Section 5.4.9.2.

CLKIN/

XTAL1

I/O

Clock Input – 25 Mhz or 50 MHz external clock or crystal input.

• In MII mode, this signal is the 25 MHz reference input clock

• In RMII mode, this signal is the 50 MHz reference input clock

which is typically also driven to the RMII compliant Ethernet

MAC clock input.

Note:

See Section 4.10, "nINT/TX_ER/TXD4 Strapping," on

page 24 for additional details on Strapping options.

XTAL2

Clock Output – 25 MHz crystal output.

Note:

Float this pin if using an external clock being driven

through CLKIN/XTAL1

TABLE 3-6:

10/100 LINE INTERFACE

Signal Name

Type

Description

TXP

Transmit Data Positive: 100Base-TX or 10Base-T differential

transmit outputs to magnetics.

TXN

Transmit Data Negative: 100Base-TX or 10Base-T differential

transmit outputs to magnetics.

RXP

Receive Data Positive: 100Base-TX or 10Base-T differential

receive inputs from magnetics.

RXN

Receive Data Negative: 100Base-TX or 10Base-T differential

receive inputs from magnetics.

TABLE 3-7:

ANALOG REFERENCES

Signal Name

Type

Description

EXRES1

Connects to reference resistor of value 12.4K-Ohm, 1% connected

as described in the Analog Layout Guidelines. The nominal

voltage is 1.2V and therefore the resistor will dissipate

approximately 1mW of power.

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