Intel Video Game Controller Intel Gigabit Ethernet Controllers User Manual
Software Developer’s Manual
135
Power Management
6.3.2.3
Transition From D0a to D3 and Back with PCI Reset
Figure 6-4. Transition From D0a to D3 and Back with PCI Reset
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Diagram #
Notes
1
Writing a 11b to the Power State field of the Power Management Control/Status Register (PMCSR) transitions
the Ethernet controller to D3.
the Ethernet controller to D3.
2
The system can delay an arbitrary amount of time between setting D3 mode and asserting RST#.
3
In 66 MHz or PCI-X
a
modes the system must assert RST# before stopping the PCI clock. It may assert RST#
without stopping the clock.
For the 82541PI/GI/EI and 82540EP, If CLK_RUN# is enabled, then they do not require a continuous clock
during this time, but does require that the system drive the clock in response to CLK_RUN# assertion.
For the 82541PI/GI/EI and 82540EP, If CLK_RUN# is enabled, then they do not require a continuous clock
during this time, but does require that the system drive the clock in response to CLK_RUN# assertion.
4
Upon assertion of RST# the Ethernet controller floats all PCI pins except PME# and goes to “Dr” state.
5
In 66 MHz or PCI-X modes, the PCI 2.2 and 2.3 specification requires the system to start the PCI clock 100 µs
before deassertion of RST#. In 33 MHz systems the PCI clock can start and stop at any time independent of
RST#.
before deassertion of RST#. In 33 MHz systems the PCI clock can start and stop at any time independent of
RST#.
6
The deassertion edge of RST# causes the EEPROM to be re-read and Wakeup disabled.
7
Synchronizing the clock circuits and circuit adjustments require up to 512 PCI clocks before the Ethernet
controller drives PCI signals and responds to PCI transactions.
controller drives PCI signals and responds to PCI transactions.
8
For the 82544GC/EI, O_PWR_STATE is set to 01b if APM Wakeup is enabled, 00b otherwise.
9
The system can delay an arbitrary time before enabling memory access.
10
Writing a 1b to the Memory Access Enable or I/O Access Enable bit in the PCI Command Register transitions
the Ethernet controller from D0u to D0 state.
For the 82544GC/EI, writing a 1b to the Memory Access Enable or I/O Access Enable bit in the PCI Command
Register transitions the Ethernet controller from D0u to D0 state and asserts both PWR_STATE outputs.
the Ethernet controller from D0u to D0 state.
For the 82544GC/EI, writing a 1b to the Memory Access Enable or I/O Access Enable bit in the PCI Command
Register transitions the Ethernet controller from D0u to D0 state and asserts both PWR_STATE outputs.
a.
Not applicable to the 82541xx, 82547GI/EI, or 82540EP/EM.