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Core Logic Module - SMI Status and ACPI Registers - Function 1
Table 6-34. F1BAR1+I/O Offset: ACPI Support Registers (Continued)
Bit
Description
4
BM_STS (Bus Master Status). Indicates if PME was caused by a system bus master requesting the system bus.
0: No.
1: Yes.
For the PME to generate an SCI, set F1BAR1+I/O Offset 0Ch[1] = 1 and F1BAR1+I/O Offset 0Ch[0] = 1. (See Note 2 in the
general description of this register.)
Write 1 to clear.
3:1
Reserved. Must be set to 0.
0
TMR_STS (Timer Carry Status). Indicates if SCI was caused by an MSB toggle (MSB changes from low-to-high or high-to-
low) on the ACPI Timer (F1BAR0+I/O Offset 1Ch or F1BAR1+I/O Offset 1Ch).
0: No.
1: Yes.
For the PME to generate an SCI, set F1BAR1+I/O Offset 0Ah[0] = 1 and F1BAR1+I/O Offset 0Ch[0] = 1. (See Note 2 in the
general description of this register.)
Write 1 to clear.
Offset 0Ah-0Bh
In order for the ACPI events described below to generate an SCI, the SCI_EN bit must also be set (F1BAR1+I/O Offset 0Ch[0] = 1).
The SCIs enabled via this register are globally enabled by setting F1BAR1+I/O Offset 08h. There is no second level of SCI status report-
ing for these bits.
15:11
Reserved. Must be set to 0.
10
RTC_EN (Real-Time Clock Enable). Allow SCI generation when the RTC generates an alarm (RTC IRQ signal is
asserted).
0: Disable.
1: Enable
9
Reserved. Must be set to 0.
8
PWRBTN_EN (Power Button Enable). Allow SCI generation when PWRBTN# goes low while the system is in a Working
state.
0: Disable.
1: Enable
7:6
Reserved. Must be set to 0.
5
GBL_EN (Global Lock Enable). Allow SCI generation when the BIOS releases control of the global lock via the BIOS_RLS
(F1BAR1+I/O Offset 0Fh[1] and GBL_STS (F1BAR1+I/O Offset 08h[5]) bits.
0: Disable.
1: Enable
4:1
Reserved. Must be set to 0.
0
TMR_EN (ACPI Timer Enable). Allow SCI generation for MSB toggles (MSB changes from low-to-high or high-to-low) on
the ACPI Timer (F1BAR0+I/O Offset 1Ch or F1BAR1+I/O Offset 1Ch).
0:
Disable.
1:
Enable
Offset 0Ch-0Dh
15:14
Reserved. Must be set to 0.
AMD Geode™ SC3200 Processor Data Book
PM1A_EN — PM1A PME/SCI Enable Register (R/W)
PM1A_CNT — PM1A Control Register (R/W)
32581C
Reset Value: 0000h
Reset Value: 0000h
247
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