Support Of Pci Power Management Interface Specification - Freescale Semiconductor MPC8313E Family Reference Manual

Powerquicc ii pro integrated processor

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System Configuration

Ethernet Link

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.

defines the PCI power states.

MPC8313E PowerQUICC II Pro Integrated Processor Family Reference Manual, Rev. 3

Figure 5-56. Power Segmentation in Deep Sleep Mode

Table 5-71. 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

defines these Dx states. The PCI power

How Supported

SYSTEM Power-down

Switchable voltage supply

SYSTEM Power-up

Constant voltage supply

Freescale Semiconductor

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