Freescale-semiconductor TWR-MCF52259-Ethenet Manual de usuario descargar pdf (Pagina 18)

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• The MII links the Ethernet MAC with

the PHY.

• An MII may support both 10-Mb/s and

100-Mb/s operation, allowing network

devices to connect to both 10BASE-T

and 100BASE-T media segments.

• The MII electronics may be linked to

an outboard transceiver through a

40-pin MII connector and a short

(0.5m) MII cable.

• The MII is internally connected to the

EPHY on the MCF5223x

Media Access

Controller

(MAC)

TX_ERn

RXDn_<3:0>

Typical MII Interface

PHY

with

MII

Magnetics/Fiber Transceiver

TXDn_<3:0>

TX_ENn

RXDVn

RX_ERn

RX_CLKn

TX_CLKn

CRSn

COLn

*Media Independent Interface (MII)

 4-bit wide Tx and Rx data @2.5MHz or 25MHz

 TTL signal levels

 Full duplex

 Media status signals:

 Carrier Presence & Collision

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 165 166

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