LU82551IT INTEL [Intel Corporation], LU82551IT Datasheet - Page 40
LU82551IT
Manufacturer Part Number
LU82551IT
Description
Fast Ethernet PCI Controller
Manufacturer
INTEL [Intel Corporation]
Datasheet
1.LU82551IT.pdf
(102 pages)
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82551IT — Networking Silicon
5.7
34
Media Independent Interface (MII) Management Interface
The MII management interface allows the CPU to control the PHY unit through a control register
in the 82551IT. This allows the software driver to place the PHY in specific modes such as full
duplex, loopback, power down, etc., without the need for specific hardware pins to select the
desired mode. This structure allows the 82551IT to query the PHY unit for status of the link. This
register is the MDI Control Register and resides at offset 10h in the 82551IT CSR. (The MDI
registers are described in detail in
to this register and the 82551IT reads or writes the control/status parameters to the PHY unit
through the MDI register. Although the 82551IT follows the MII format, the MI bus is not
accessible on external pins.
Section 9.0, “PHY Unit
Registers”.) The CPU writes commands
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