AMD SC1200 Index EDh-F3h, Index F4h, Index F5h Second Level PME/SMI Status Register 2 RC, 220

32579B Core Logic Module - Bridge, GPIO, and LPC Registers - Function 0

Table 6-29. F0: PCI Header/Bridge Configuration Registers for GPIO and LPC Support (Continued)

Bit	Description
Index ECh	Timer Test Register (R/W)	Reset Value: 00h

7:0

Timer Test Value. The Timer Test register is intended only for test and debug purposes. It is not intended for setting opera- tional timebases. For normal operation, never write to this register.

Index EDh-F3h	Reserved	Reset Value: 00h
Index F4h	Second Level PME/SMI Status Register 1 (RC)	Reset Value: 00h

The bits in this register contain second level status reporting. Top level status is reported in F1BAR0+I/O Offset 00h/02h[0].

Reading this register clears the status at both the second and top levels.

A read-only “Mirror” version of this register exists at F0 Index 84h. If the value of the register must be read without clearing the SMI source (and consequently de-asserting SMI), F0 Index 84h can be read instead.

7:3 Reserved. Reads as 0.

2GPWIO2 SMI Status. Indicates whether or not an SMI was caused by a transition on the GPWIO2 pin.

0:No.

1:Yes.

To enable SMI generation:

1)Ensure that GPWIO2 is enabled as an input: F1BAR1+I/O Offset 15h[2] = 0.

2)Set F1BAR1+I/O Offset 15h[6] = 1 to allow SMI generation.

1GPWIO1 SMI Status. Indicates whether or not an SMI was caused by a transition on the GPWIO1 pin. 0: No.

1: Yes.

To enable SMI generation:

1)Ensure that GPWIO1 is enabled as an input: F1BAR1+I/O Offset 15h[1] = 0.

2)Set F1BAR1+I/O Offset 15h[5] to 1 to allow SMI generation.

0GPWIO0 SMI Status. Indicates whether or not an SMI was caused by a transition on the GPWIO0 pin.

0:No

1:Yes

To enable SMI generation:

1)Ensure that GPWIO0 is enabled as an input: F1BAR1+I/O Offset 15h[0] = 0.

2)Set F1BAR1+I/O Offset 15h[4] to 1 to allow SMI generation.

Index F5h Second Level PME/SMI Status Register 2 (RC) Reset Value: 00h

The bits in this register contain second level status reporting. Top level status is reported in F1BAR0+I/O Offset 00h/02h[0].

Reading this register clears the status at both the second and top levels.

A read-only “Mirror” version of this register exists at F0 Index 85h. If the value of the register must be read without clearing the SMI source (and consequently de-asserting SMI), F0 Index 85h can be read instead.

7Video Idle Timer SMI Status. Indicates whether or not an SMI was caused by expiration of Video Idle Timer Count Regis- ter, (F0 Index A6h).

0:No.

1:Yes.

To enable SMI generation, set F0 Index 81h[7] = 1.

6User Defined Device Idle Timer 3 (UDEF3) SMI Status. Indicates whether or not an SMI was caused by expiration of User Defined Device 3 (UDEF3) Idle Timer Count Register (F0 Index A4h).

0:No.

1:Yes.

To enable SMI generation, set F0 Index 81h[6] = 1.

5User Defined Device Idle Timer 2 (UDEF2) SMI Status. Indicates whether or not an SMI was caused by expiration of User Defined Device 2 (UDEF2) Idle Timer Count Register (F0 Index A2h).

0:No.

1:Yes.

To enable SMI generation, set F0 Index 81h[5] = 1.

220 AMD Geode™ SC1200/SC1201 Processor Data Book