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Revision 4.1

Functional Description (Continued)

3.4.3.6

Device Power Management Register Programming Summary

Table 3-34 provides a programming register summary of

the device idle timers, address traps, and general purpose

I/O pins. For complete bit information regarding the regis-

ters listed in Table 3-34, refer to Section 4.3.1 “Bridge

Configuration Registers - Function 0” on page 149 and

Section 4.3.2 “SMI Status and ACPI Timer Registers -

Function 1” on page 179.

F0 Index F7h

Second Level Power Management Status Register 4 (RO/RC)

Reset Value = 00h

GPIO2 SMI Status (Read to Clear): SMI was caused by transition on (properly-configured) GPIO2 pin?

0= No; 1 = Yes.

This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].

SMI generation enabling is at F0 Index 92h[2].

GPIO1 SMI Status (Read to Clear): SMI was caused by transition on (properly-configured) GPIO1 pin?

0= No; 1 = Yes.

This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].

SMI generation enabling is at F0 Index 92h[1].

GPIO0 SMI Status (Read to Clear): SMI was caused by transition on (properly-configured) GPIO0 pin?

0= No; 1 = Yes.

This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].

SMI generation enabling is at F0 Index 92h[0].

Lid Position (Read Only): This bit maintains the current status of the lid position. If the GPIO6 pin is configured as the lid

switch indicator, this bit reflects the state of the pin.

Lid Switch SMI Status (Read to Clear): SMI was caused by a transition on the GPIO6 (lid switch) pin?

0= No; 1 = Yes.

For this to happen, the GPIO6 pin must be configured both as an input (F0 Index 90h[6] = 0) and as the lid switch (F0

Index 92h[6] =1).

Codec SDATA_IN SMI Status (Read to Clear): SMI was caused by an AC97 codec producing a positive edge on

SDATA_IN? 0 = No; 1 = Yes.

This is the second level of status is reporting. The top level status is reported in F1BAR+Memory Offset 00h/02h[0].

SMI generation enabling is at F0 Index 80h[5].

RTC Alarm (IRQ8) SMI Status (Read to Clear): SMI was caused by an RTC interrupt? 0 = No; 1 = Yes.

This SMI event can only occur while in 3V Suspend and RTC interrupt occurs.

This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].

ACPI Timer SMI Status (Read to Clear): SMI was caused by an ACPI Timer MSB toggle? 0 = No; 1 = Yes.

This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].

SMI generation configuration is at F0 Index 83h[5].

Note: Properly-configured means that the GPIO pin must be enabled as a GPIO, an input, and to cause an SMI.

This register provides status on several miscellaneous power management events that generate SMIs, as well as the status of

the Lid Switch. Reading this register clears the SMI status bits. A read-only (mirror) version of this register exists at F0 Index

87h.

Table 3-33. Second Level Pwr Mgmnt SMI Status Reporting Registers (Read to Clear) (Continued)

Bit

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