SC2200 datasheet(245/433 Pages) NSC

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Core Logic Module (Continued)

SMI Source is Video Retrace. Indicates whether or not an SMI was caused by a video retrace event as decoded from the

internal serial connection (PSERIAL register, bit 7) from the GX1 module.

0: No.

1: Yes.

To enable SMI generation, set F0 Index 83h[2] to 1.

Reserved. Reads as 0.

SMI SourceisLPC. Indicates whether or not an SMI was caused by the LPC interface.

0: No.

1: Yes.

The next level (second level) of SMI status is at F0BAR1+I/O Offset 1Ch[6:5].

SMI Source is ACPI. Indicates whether or not an SMI was caused by an access (read or write) to one of the ACPI registers

(F1BAR1).

0: No.

1: Yes.

The next level (second level) of SMI status is at F1BAR0+I/O Offset 20h.

SMI Source is XpressAUDIO Subsystem. Indicates whether or not an SMI was caused by the audio subsystem.

0: No.

1: Yes.

The next level (second level) of SMI status is at F3BAR0+Memory Offset 10h/12h.

SMI Source is Power Management Event. Indicates whether or not an SMI was caused by one of the power management

resources (except for GP timers, UDEFx and PCI/ISA function traps that are reported in bit 9).

0: No.

1: Yes.

The next level (second level) of SMI status is at F0 Index 84h-F4h/87h-F7h.

Offset 02h-03h

Top Level PME/SMI Status Register (RO/RC)

Reset Value: 0000h

Note:

Reading this register clears all the SMI status bits except for the "read only" bits, because they have a second level of status

reporting. Clearing the second level status bits also clears the top level (except for GPIOs).

GPIO SMIs have third level of SMI status reporting at F0BAR0+I/O Offset 0Ch/1Ch. Clearing the third level GPIO status bits

also clears the second and top levels.

A read-only “Mirror” version of this register exists at F1BAR0+I/O Offset 00h. If the value of the register must be read without

clearing the SMI source (and consequently deasserting SMI), F1BAR0+I/O Offset 00h can be read instead.

Suspend Modulation Enable Mirror. (Read to Clear)

This bit mirrors the Suspend Mode Configuration bit (F0 Index 96h[0]). It is used by the SMI handler to determine if the SMI

Speedup Disable Register (F1BAR0+I/O Offset 08h) must be cleared on exit.

SMI Source is USB. (Read to Clear) Indicates whether or not an SMI was caused by USB activity.

0: No.

1: Yes.

To enable SMI generation, set F5BAR0+I/O Offset 00h[20:19] to 11.

SMI Source is Warm Reset Command. (Read to Clear) Indicates whether or not an SMI was caused by Warm Reset

command

0: No.

1: Yes.

SMI Source is NMI. (Read to Clear) Indicates whether or not an SMI was caused by NMI activity.

0: No.

1: Yes.

SMI Source is SuperI/O. (Read to Clear) Indicates whether or not an SMI was caused by SuperI/O.

0: No.

1: Yes.

The next level (second level) of SMI status is reported in the SuperI/O module. See Table 4-29 "Banks 0 and 1 - Common

Control and Status Registers" on page 127 for details.

Table 5-33. F1BAR0+I/O Offset: SMI Status Registers (Continued)

Bit

Description

SC2200 Datasheet(PDF) 245 Page - National Semiconductor (TI)

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