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Revision 1.1

Core Logic Module (Continued)

5.2.9.3

Power Planes Control

The SC1100 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 SC1100 itself. Table 5-7 describes the SC1100

power planes with respect to the different Sleep and Global

states.

The SC1100 power planes are controlled externally by the

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

the system design is such that Table 5-7 is met) for all 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.

The case in which VSB does not exist is called Mechanical

Off (G3).

5.2.9.4

Power Management Events

The SC1100 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

the system back to the working state.

• 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-

erate an SCI or SMI.

Table 5-6. Power Planes Control Signals vs.

Sleep States

Signal

SL1

SL2

SL3

SL4

and

SL5

PWRCNT1

11000

PWRCNT2

11100

ONCTL#

00001

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

Sleep/

Global

State

VCORE, VI/O,

VPLL

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

IRRX1

Yes

RI2#

Yes

GPWIO

Yes

Internal SMI signal

Yes

SC1100 Datasheet(PDF) 136 Page - National Semiconductor (TI)

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