LAN8670 datasheet(13/30 Pages) MICROCHIP

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Name

Symbol

Buffer Type

Description

Receive Data Valid

(MII Mode)

RXDV

VOH-VDDP

Indicates that recovered and decoded data is available on the

RXD[3:0] pins.

This signal is not used in RMII mode.

Receive Clock

(MII Mode)

RXCLK

VO-VDDP

In MII mode, this pin is the 2.5 MHz receive clock output.

In RMII mode, this pin is unused and is driven low. It should be

left unconnected.

Carrier Sense / Receive Data

Valid (RMII Mode)

CRSDV

VOH-VDDP

This signal is asserted to indicate the receive medium is non-

idle in RMII mode.

This signal is not used in MII mode.

Collision Detect

(MII Mode)

COL

VO-VDDP

Collision Detect.

In RMII mode, this pin is unused and is driven low.

Carrier Sense

(MII Mode)

CRS

VO-VDDP

Carrier Sense.

In RMII mode, this pin is unused and is driven low.

Table 3-5. Ethernet Transceiver Pins

Name

Symbol

Buffer Type

Description

Ethernet TX/RX Positive Terminal

TRXP

AIO

Positive terminal for transmit/receive signal.

Ethernet TX/RX Negative Terminal

TRXN

AIO

Negative terminal for transmit/receive signal.

Table 3-6. Serial Management Interface (SMI) Pins

Name

Symbol

Buffer Type

Description

SMI Data Input/Output

MDIO

VIS-VDDP /

VO-VDDP

Serial Management Interface data input/output.

SMI Clock

MDC

VIS-VDDP

Serial Management Interface clock.

Table 3-7. Miscellaneous Pins

Name

Symbol

Buffer Type

Description

External 25 MHz Crystal Input

XTI

ICLK

External 25 MHz crystal input.

External Clock Input

REFCLKIN

ICLK

Single-ended clock oscillator input. A frequency of 25 MHz shall

be used in all modes except RMII, which requires 50 MHz.

Note: When using a single-ended clock oscillator, XTO must

be left unconnected with <10 pF stray capacitance.

External 25 MHz Crystal Output

XTO

OCLK

External 25 MHz crystal output.

Note: When using a single-ended clock oscillator on XTI/

REFCLKIN, this pin must be left unconnected with <10 pF stray

capacitance.

Interrupt

IRQ_N

VOD-VDDP

Device interrupt. Active low and open drain.

Note: When used, this pin requires a 10 kΩ (typical) pull-up to

VDDP.

Note: This pin is to be unconnected when unused.

System Reset

RESET_N

VIS-VDDP

System reset. This pin is active low.

If unused, this pin must be pulled-up to VDDP.

LAN8670/1/2

Pin Description and Configuration

and its subsidiaries

Product Brief

DS60001536E-page 13

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