PC87372 datasheet(70/144 Pages) NSC

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Revision 1.2

6.0

System Wake-Up Control (SWC)

6.1 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 PC87372 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:

• 12 V

SB-powered General-Purpose Input/Output events (GPIOE13-10 and GPIOE07-00).

• Modem Ring event (RI).

• 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 Fan Speed Monitor or the Legacy functional blocks (FDC, Parallel Port and Serial

Port).

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.

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 SWC module is powered by VSB3.

Figure 13 shows the simplified block diagram of the SWC functional block.

Figure 13. SWC Block Diagram

External

Events

SIOPME

SCI

Interrupt

Status

GRN_LED

YLW_LED

LED

Control

Debounce

and

Detection

Event

Status

Internal

Events

VDD3 Status

SPL_S3

SLP_S5

Keyboard

and Mouse

Detection

Event

Enable

SCI

Interrupt

Enable

(IRQ)

IRQ

Routing

Control

PC87372 Datasheet(PDF) 70 Page - National Semiconductor (TI)

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