Power Management
BCM5718 Programmer’s Guide
Broadcom
®
January 29, 2016 • 5718-PG108-R
Page 189
• WOL
• PCI Vaux Supply
• PCI Slot Power Supply
• GPIO
Operational Characteristics
applies to the Ethernet controller reference designs. The MAC GPIO pins are available
for application specific usage; however, Broadcom encourages both software and hardware engineers to follow
the Broadcom design guidelines and application notes. NIC and LOM designs use external board level logic to
switch power regulators for D3 ACPI mode.
Figure 45: Power State Transition Diagram
Device State D0 (Uninitialized)
The D0 state is entered after a PCI reset or device (software) reset. The assertion of PME causes the PCI bridge
to drive RST. The MAC hardware blocks are not initialized in this state.
Example:
The RX engine, TX engine, multicast filter, and memory arbiter are all uninitialized. All the MAC
functional blocks are powered.
D0
Unitialized
D3 Cold
(PME
Enabled)
D3 Hot
D0
Active
PCI Slot
(3.3v or 5.0v) Power
Removed
PME Asserted
or
Hardware reset
PCI I/O Pins Powered
from PCI Vaux Supply
Device driver
initializes state
machines,
memory arbiter,
and so on
Device driver sets
PMCSR register to
power state D3
and
GPIO0, 1, and 2
PME Asserted
or
Software reset
PCI I/O Pins Powered
from PCI Slot Supply
Other I/O functions and
core logic powered
from PCI Vaux
Device driver sets
PMCSR register
to power state D3
and
GPIO0, 1, and 2