Texas Instruments TMS320C645x DSP - Manual (Page 20)

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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
EMAC
MDIO
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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