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2.3.3 Gigabit Media Independent Interface (GMII) Connections

MTCLK

MTXD[7−0]

MTXEN

MCOL

MCRS

MRCLK

MRXD[7−0]

MRXDV

MRXER

MDCLK

MDIO

Physical

layer

device

(PHY)

System

core

Transformer

2.5 MHz,

25 MHz,

RJ−45

EMACMDIO

GMTCLK

or 125 MHz

EMAC Functional Architecture

Figure 4 shows a device with integrated EMAC and MDIO interfaced via a GMII connection. This interface

is available in 10 Mbps, 100 Mbps, and 1000 Mbps modes.

Figure 4. Ethernet Configuration with GMII Interface

The GMII interface supports 10/100/1000 Mbps modes. Only full-duplex mode is available in 1000 Mbps

mode. In 10/100 Mbps modes, the GMII interface acts like an MII interface, and only the lower 4 bits of

data are transferred for each of the data buses.

20 Ethernet Media Access Controller (EMAC)/Management Data Input/Output (MDIO) SPRU975B – August 2006

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Texas-instruments TMS320C645x DSP Manual do Utilizador Página 20