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12.
Intel 852GM Platform Power Delivery
Guidelines
12.1.
Definitions
Table 88. Power Delivery Definitions
Term
S0/Full-On operation:
S1M/Power-On-Suspend
(POS, Mobile):
S3/Suspend-To-RAM
(STR):
S4/Suspend-To-Disk
(STD):
S5/Soft-Off:
Full-Power operation:
Suspend operation:
Core power rail:
Standby power rail:
Derived power rail:
12.2.
Platform Power Requirements
The following figure shows the power delivery architecture for an example of the Intel 852GM chipset
platform. To ensure that enough power is available during S3, a thorough power budget should be
completed. The power requirements should include each device's power requirements, S0 – S5. The
power requirements should be compared against the power budget supplied by the power supply.
®
Intel
852GM Chipset Platform Design Guide
Intel 852GM Platform Power Delivery Guidelines
In the S0 state, all components on the motherboard are powered and the system is fully
functional.
In the mobile implementation of the S1M state, the outputs of the clock chip are stopped
in order to save power. All components remain powered but may or may not be in a low
power state.
In the S3 state, the system state is stored in main memory and all unnecessary system
logic is turned off. Only main memory and logic required to wake the system remain
powered.
In the S4 state, the system state is stored in non-volatile secondary storage (e.g. a hard
disk) and all unnecessary system logic is turned off. Only logic required to wake the
system remain powered. Standby power rails may or may not be powered depending on
system design and the presence of AC or battery power.
The S5 state corresponds to the G2 state. Restart is only possible with the power button.
During Full-Power operation, all components remain powered. Full-power operation
includes both S0 and the S1-M (CPU Stop-Grant state).
Intel 852GM chipset-based systems can be designed to support a number of suspend
states such as Power-On-Suspend (S1M), Suspend-to-RAM (S3), Suspend-to-Disk (S4),
and Soft-Off (S5). During suspend operation, with exception of S1M, power is removed
from some components on the motherboard.
A power rail that is only on during full-power operation.
A power rail that is on during a suspend operation (S3, S4 or S5). The rail is also on
during full-power operation.
A derived power rail is any power rail that is generated from another power rail using an
on-board voltage regulator. For example, 3.3 V
from 5 V
using a voltage regulator.
SB
Definition
is usually derived (on the motherboard)
SB
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