W5300 datasheet(18/128 Pages) WIZNET

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1.5 MII interface signal for external PHY

MII interface signals are for interfacing to external PHY instead of the internal PHY of W5300.

These signals can be used at the external PHY mode (TEST_Mode[3:0] =

“0001” or “0010”).

Refer to “1.2 Configuration Signals”.

At the internal PHY mode, just let them float because the pins except for multi-function pins are

internal pulled-down.

Symbol

Type

Description

/TXLED(MII_TXEN)

OMH

Transmit Act LED / Transmit Enable

This signal indicates the presence of transmit packet on the

MII_TXD[3:0]. It is asserted high when the first nibble data of

transmit packet is valid on MII_TXD[3:0] and is de-asserted low

after the last nibble data of transmit packet is clocked out on

MII_TXD[3:0].

/RXLED(MII_TXD3)

/RXLED,/COLLED,/LEDFDX,/SPDLED / Transmit data output

The transmit packet is synchronized with MII_TXC clock and

output to external PHY in nibble unit.

MII_TXD3 is the Most Significant Bit (MSB).

/COLLED(MII_TXD2)

/FDXLED(MII_TXD1)

/SPDLED(MII_TXD0)

MII_TXC

Transmit Clock Input

It is a continuous transmit clock from the external PHY. It is

25MHz at the 100BaseTX and 2.5MHz at the 10 BaseT.

Transmit clock is used as timing reference of MII_TXD[3:0] and

used for network operation clock (NIC_CLK).

Rising Edge Sensitive.

MII_CRS

IDH

Carrier Sense

It is signal to notify the link traffic of the media. If carrier of

media is not idle (carrier present), it is asserted high.

MII_COL

IDH

Collision Detect

When collision is detected on the media, it is asserted high.

It is valid at the half-duplex and ignored at the full-duplex.

Asynchronous signal.

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