Freescale Semiconductor MPC8313E PowerQUICC II Pro Family Reference Manual page 283

e300 PPC
CSB Bus
Ethernet Link
SGMII
PHY I/F
5.8.3.5 Support of PCI Power Management Interface Specification
The device will support the PCI power states D0, D1, D2, D3Hot, and D3Cold as defined in the Rev. 1.2
of the PCI Power Management Interface Specification.
management specification defines a power management event, or PME, as the process by which a PCI
agent signals a request to the host for a change in its power consumption state. When in agent mode, the
device has the capability to generate PME signaling through the assertion of an external PCI_PME signal.
As host, the device is able to respond to PME signaling as a wake-up event.
It is assumed that in D3Cold all power will be removed from the device, so PCI_PME signaling is not
supported from D3Cold. Instead, an MPC8313E-specific D3Warm state is defined. The difference
between D3Hot and D3Warm is that in D3Hot the device's entire core region is supplied with the nominal
1-V VDD supply. In D3Warm, a portion of the core region can be powered off. This partial power-down
mode allows the device to achieve significant reduction in power dissipation while still maintaining the
capability to respond to wake-up events.
Table 5-72 defines the PCI power states.
PCI Dx Power
Supported
State
D0 Yes
D1 Yes
D2 Yes
MPC8313E PowerQUICC™ II Pro Integrated Processor Family Reference Manual, Rev. 2
Freescale Semiconductor
System
Peripherals
PMC
eTSEC
RTC / GTM
Figure 5-56. Power Segmentation in Deep Sleep Mode
Table 5-72. PCI Defined Power Management State Support
Default state; full power; PME signaling supported through software control
e300 in Doze mode; e300 PLL running; PME signaling supported
e300 in Nap state; e300 PLL running; PME signaling supported
DDR Local Bus
Controller Controller
USB
PCI
GPIO
Table 5-72 defines these Dx states. The PCI power
How Supported
System Configuration
SYSTEM Power-down
VDD domain
Switchable voltage supply
SYSTEM Power-up
VDDC domain
Constant voltage supply
USB Link
USB
PHY
5-75