pc87591l National Semiconductor Corporation, pc87591l Datasheet - Page 318

• Manufacturer Part Number: pc87591l
• Description: Lpc Mobile Embedded Controllers
• Manufacturer: National Semiconductor Corporation

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Host Controller Interface Modules
5.5
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 V
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
The MSWC recognizes the following maskable system events:
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:
5.5.2
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.
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
Power-Up Request (PWUREQ)
System Management Interrupt (SMI)
Interrupt to the host (IRQ)
MSWC interrupt to the core
Modules’ IRQs
RI1 RI2
RING Input
Off Event
RTC Alarm
MOBILE SYSTEM WAKE-UP CONTROL (MSWC)
Features
Wake-Up Event Detection and Status Bits
Host Domain Internal Bus
Core Peripheral Bus
Detection
Wake-Up
Event
Configuration
Control &
Figure 104. MSWC Block Diagram
Registers
CC
, it can operate in low power consumption states. Some MSWC operations
Configuration
(Continued)
Wake-Up
MSWC Interrupt
318
Status Registers
SMI
PWUREQ
SMI
IRQ
PM I/F
Channels
Revision 1.07