SC2200 datasheet(169/433 Pages) NSC

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Core Logic Module (Continued)

5.2.9.3

Power Planes Control

The SC2200 supports up to three power planes. Three sig-

nals are used to control these power planes. Table 5-6

describes the signals and when each is asserted.

These signals allow control of the power of system devices

and the SC2200 itself. Table 5-7 describes the SC2200

power planes with respect to the different Sleep and Global

states.

The SC2200 power planes are controlled externally by the

three signals (i.e., the system designer should make sure

thesystemdesignissuchthatTable5-7 is met) forall sup-

ported Sleep states.

VSB and VBAT are not controlled by any control signal. VSB

exists as long as the AC power is plugged in (for desktop

systems) or the main battery is charged (for mobile sys-

tems). VBAT exists as long as the RTC battery is charged.

Thecaseinwhich VSB does not exist is called Mechanical

Off (G3).

5.2.9.4

Power Management Events

The SC2200 supports power management events that can

manage:

• Transition of the system from a Sleep state to a Work

state. This is done by the hardware. These events are

defined as wakeup events.

• Enabled wakeup events to set the WAK_STS bit

(F1BAR1+I/O Offset 08h[15]) to 1, when transitioning

thesystem back tothe workingstate.

• Generation of an interrupt. This invokes the relevant

software driver. The interrupt can either be an SMI or

SCI (selected by the SCI_EN bit, F1BAR1+I/O Offset

0Ch[0]). These events are defined as interrupt events.

Table 5-8 lists the power management events that can gen-

erateanSCI or SMI.

Power Button

The power button (PWRBTN#) input provides two events: a

wake request, and a sleep request. For both these events,

the PWRBTN# signal is debounced (i.e., the signal state is

transferred only after 14 to 16 msec without transitions, to

ensure that the signal is no longer bouncing).

ACPI is non-functional when the power-up sequence does

not include using the power button. If ACPI functionality is

desired, the power button must be toggled. This can be

done externally or internally. GPIO63 is internally con-

nected to PWRBTN#. To toggle the power button with soft-

ware, GPIO63 must be programmed as an output using the

normal GPIO programming protocol (see Section 5.4.1.1

"GPIO Support Registers" on page 231). GPIO63 must be

pulsed low for at least 16 msec and not more than 4 sec.

Asserting POR# has no effect on ACPI. If POR# is

asserted and ACPI was active prior to POR#, then ACPI

Table 5-6. Power Planes Control Signals vs.

Sleep States

Signal

SL1

SL2

SL3

SL4

and

SL5

PWRCNT111000

PWRCNT211100

ONCTL#

00001

Table 5-7. Power Planes vs. Sleep/Global States

Sleep/

Global State

VCORE,VCCCRT,

VI/O, VPLL,

AVCCCRT

VSB,

VSBL

VBAT

S0, SL1 and

SL2

On or Off

SL3, SL4

and SL5

Off

On or Off

Off

No Power

Off

Illegal

Off

On or Off

Table 5-8. Power Management Events

Event

SCI

SMI

Power Button

Yes

Power Button Override

Yes

Bus Master Request

Yes

Thermal Monitoring

Yes

USB

Yes

RTC

Yes

ACPI Timer

Yes

GPIO

Yes

SDATA_IN2 (AC97)

Yes

IRRX1

Yes

RI2#

Yes

GPWIO

Yes

Internal SMI signal

Yes

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