The Uni-N IC includes an Ethernet media access controller (MAC) that implements the link layer. The Uni-N IC provides DB-DMA support for the Ethernet interface.
The Ethernet controller in the Uni-N IC is connected to a PHY interface IC that provides the electrical signals to the port. The PHY is capable of operating in either 10Base-T, 100Base-T, or 1000Base-T mode: The actual speed of the link is automatically negotiated by the PHY and the bridge or router to which it is connected. For more information, see "Ethernet Port" (page 38).
The PHY supports Auto-MDIX, which allows the use of straight-through cables in crossover situations (and conversely). For more information, see "Ethernet Port" (page 38).
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