PC87591L datasheet(318/437 Pages) NSC

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Host Controller Interface Modules (Continued)

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Revision 1.07

5.5

MOBILE SYSTEM WAKE-UP CONTROL (MSWC)

The MSWC detects and handles wake-up events from various sources in the host-controlled modules. The MSWC gener-

ates interrupts to the host via SMI or PWUREQ, and/or alerts the core, which enables the core to control the wake-up se-

quence. Since the MSWC is powered by VCC, it can operate in low power consumption states. Some MSWC operations

depend on the presence of a clock; these functions are not available when the core clock is turned off.

Figure 104 shows the block diagram of the MSWC.

5.5.1

Features

The MSWC recognizes the following maskable system events:

●

Modem ring (RI1 and RI2 pins)

●

Telephone ring (RING input pin)

●

Wake-up on module IRQs for RTC, KBD and Mouse

●

Software events

— Software triggered wake-up event

— ACPI power state change indications

— Software off command

The MSWC notifies the host and/or core when any of the above events occur by asserting one or more of the following output

pins:

●

Power-Up Request (PWUREQ)

●

System Management Interrupt (SMI)

●

Interrupt to the host (IRQ)

●

MSWC interrupt to the core

5.5.2

Wake-Up Event Detection and Status Bits

The MSWC monitors various system signals for a wake-up event. When an event is detected, a status bit is set to record it.

Each event goes to the Wake-Up Mode Control Logic, which determines its effect (see Figure 105 for an illustration of this

mechanism). A set of dedicated registers is used to determine the wake-up criteria, including the RING detection mode.

Figure 104. MSWC Block Diagram

Core Peripheral Bus

Host Domain Internal Bus

Wake-Up

Configuration

RI1 RI2

Modules’ IRQs

RING Input

SMI

PWUREQ

Status Registers

Configuration

Registers

Off Event

RTC Alarm

SMI

MSWC Interrupt

Control &

Wake-Up

Event

Detection

IRQ

PM I/F

Channels

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