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Software Developer’s Manual 193
PHY Functionality and Features
11.5 Initialization
Note: Section 11.5 through Section 11.14 apply only to the 82541xx and 82547GI/EI Ethernet
controllers.
At power-up or reset, the PHY core performs the initialization as shown in Figure 11-1. The
software driver has access to the PHY register 0d, bits 15 and 11 for PHY reset and PHY Power
Down control, respectively.
Figure 11-1. PHY Initialization Sequence
11.5.1 MDIO Control Mode
In the MDIO Control mode, the PHY uses the Hardware Control Interface to set up initial (default)
values of the MDIO registers. Once initial values are set, bit control reverts to the MDIO interface.
The PHY can perform some low level initializations such as DSP configuration based upon
EEPROM settings. The details of those initializations are reserved.
Power-up
or
Reset
Read H/W
Control
Interface
Initialize
MDIO
Registers
Pass control
to
MDIO Interface