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EMAC Functional Architecture
2.3.3
Gigabit Media Independent Interface (GMII) Connections
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.
System
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)
Figure 4. Ethernet Configuration with GMII Interface
MTCLK
GMTCLK
MTXD[7−0]
MTXEN
MCOL
MCRS
MRCLK
core
MRXD[7−0]
MRXDV
MRXER
MDCLK
MDIO
2.5 MHz,
25 MHz,
or 125 MHz
Physical
layer
Transformer
device
(PHY)
RJ−45
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SPRU975B – August 2006
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