PC8374L datasheet(81/239 Pages) NSC

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Revision 1.1

4.0

System Wake-Up Control (SWC)

4.1 OVERVIEW

The System Wake-Up Control (SWC) supports the ACPI Specification, Revision 2.0, Feb. 2, 1999.

The SWC functional block receives external events from the system; it also receives internal events from the functional

blocks of the PC8374L device. Based on these events, the SWC generates the Power Management SCI interrupt (SIOPME)

and the system interrupt (IRQ). In addition, it controls two LED indicators.

The SWC receives the following external events:

• 15 V

SB-powered General-Purpose Input/Output events (GPIOE17-16, GPIOE14-10 and GPIOE07-00).

• Modem Ring events (RI1 and RI2).

• Mouse movement and button pressing events (via MCLK and MDAT).

• Advanced key pressing events from the Keyboard (via KBCLK and KBDAT).

The SWC receives the following internal events:

• Keyboard and Mouse interrupt event (IRQ).

• Module interrupt (IRQ) event from the Legacy functional blocks (FDC, Parallel Port, Serial Ports 1 and 2 and InfraRed

Port) and Health Management.

• Fan alarm from the Health Management module

• Alarms from the Health Management module

The SWC implements the ACPI generic register group (General-Purpose Event 1 group) with “child” events.

The SWC generates the Power Management Event signal (the ACPI interrupt, SIOPME) and the system interrupt (IRQ)

based on the external and internal events and on the routing information written into the General-Purpose Event 1 register

group. The ACPI-compatible SCI interrupt (SIOPME) and the system interrupt (IRQ) are independent of the current sleep

state.

The SWC receives sleep state information via the SLP_S3 and SLP_S5 pins from an external ACPI controller and receives

power supply status information via PWRGD_PS pin from the system power supply.

In addition, the SWC controls two LED indicators. The Standard LED Control option is used to provide blinking or constantly

lit LEDs. The Advanced LED Control option provides programmable blink based on the current sleep state information or on

the status of the VSB3 and VDD3 power supplies. The Special LED Control option provides blinking or constantly lit LEDs,

based on the current sleep state information or on the status of the Main Power Supply and on a software controlled bit.

The SWC includes the Last Power State Special Power Management function. This function saves the system power state

when an AC power failure occurs.

The SWC module is powered by the VSB3 and VBAT planes (see Section 2.1.1 on page 32). However, during Power Fail

state (i.e., when only VBAT is present), the module functions (event detection, output generation and LEDs control) are dis-

abled and only the VBAT-powered Last Power State function is active.

Figure 11 shows the simplified block diagram of the SWC functional block.

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PC8374L Datasheet(PDF) 81 Page - National Semiconductor (TI)