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Core Logic Module (Continued)

PWRBTN_DBNC_DIS (Power Button Debouncer). Allow a high-to-low or low-to-high transition of greater than 15.8 msec

(debounce period) on PWRBTN# before it is recognized.

0: Enable. (Default)

1: Disable.

Offset 08h-09h

PM1A_STS — PM1A Top Level PME/SCI Status Register (R/W)

Reset Value: 0000h

Notes:

This is the top level of PME/SCI status reporting for these events. There is no second level.

If SCI generation is not desired, the status bits are still set by the described conditions and can be used for monitoring pur-

poses.

WAK_STS (Wakeup Status). Indicates whether or not an SCI was caused by the occurrence of an enabled wakeup event.

0: No.

1: Yes.

This bit is set when the system is in any Sleep state and an enabled wakeup event occurs (wakeup events are configured at

F1BAR1+I/O Offset 0Ah and 12h). After this bit is set, the system transitions to a Working state.

SCI generation is always enabled.

Write 1 to clear.

14:12

Reserved. Must be set to 0.

PWRBTNOR_STS (Power Button Override Status). Indicates whether or not an SCI was caused by the power button

being active for greater than 4 seconds.

0: No.

1: Yes.

SCI generation is always enabled.

Write 1 to clear.

RTC_STS (Real-Time Clock Status). Indicates if a Power Management Event (PME) was caused by the RTC generating

an alarm (RTC IRQ signal is asserted).

0: No.

1: Yes.

For the PME to generate an SCI, set F1BAR1+I/O Offset 0Ah[10] to 1 and F1BAR1+I/O Offset 0Ch[0] to 1. (See Note 2 in

the general description of this register.)

Write 1 to clear.

Reserved. Must be set to 0.

PWRBTN_STS (Power Button Status). Indicates if PME was caused by the PWRBTN# going low while the system is in a

Working state.

0: No.

1: Yes.

For the PME to generate an SCI, set F1BAR1+I/O Offset 0Ah[8] = 1 and F1BAR1+I/O Offset 0Ch[0] = 1. (See Note 2 in the

general description of this register.)

In a Sleep state or the Soft-Off state, a wakeup event is generated when the power button is pressed (regardless of the

PWRBTN_EN bit, F1BAR1+I/O Offset 0Ah[8], setting).

Write 1 to clear.

7:6

Reserved. Must be set to 0.

GBL_STS (Global Lock Status). Indicates if PME was caused by the BIOS releasing control of the global lock.

0: No.

1: Yes.

This bit is used by the BIOS to generate an SCI. BIOS writes the BIOS_RLS bit (F1BAR1+I/O Offset 0Fh[1]) which in turns

sets the GBL_STS bit and raises a PME.

For the PME to generate an SCI, set F1BAR1+I/O Offset 0Ah[5] to 1 and F1BAR1+I/O Offset 0Ch[0] to 1. (See Note 2 in the

general description of this register.)

Write 1 to clear.

Table 5-34. F1BAR1+I/O Offset: ACPI Support Registers (Continued)

Bit

Description

SC2200 Datasheet(PDF) 254 Page - National Semiconductor (TI)

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