
260
AMD Geode™ SC2200 Processor Data Book
Core Logic Module - SMI Status and ACPI Registers - Function 1
32580B
3
GPIO_STS.
Indicates if
PME was caused by activity on any of the GPIOs (GPIO47-GPIO32 and GPIO15-GPIO0).
0: No.
1: Yes.
Write 1 to clear.
For the PME to generate an SCI, set I/O Offset 12h[3] = 1 and I/O Offset 0Ch[0] = 1. (See Note 2 in the
general description of this register above).
I/O Offset 08h/18h selects which GPIOs are enabled to generate a PME. In addition, the selected GPIO must be
enabled as an input (I/O Offset 20h and 24h).
2:1
Reserved.
Reads as 0.
0
PWR_U_REQ_STS.
Indicates if PME was caused by a power-up request event from the SuperI/O module.
0: No.
1: Yes.
Write 1 to clear.
For the PME to generate an SCI, set I/O Offset 12h[0] = 1 and I/O Offset 0Ch[0] = 1. (See Note 2 in the
general description of this register above.)
Offset 12h-13h
GPE0_EN — General Purpose Event 0 Enable Register (R/W)
Reset Value: 0000h
In order for the ACPI events described below to generate an SCI, the SCI_EN bit must also be set (I/O Offset 0Ch[0] = 1).
The SCIs enabled in this register are globally enabled by setting I/O Offset 0Ch[0] to 1. The status of the SCIs is reported in
I/O Offset 10h.
15:12
Reserved.
11
Reserved.
10
GPWIO2_EN.
Allow GPWIO2 to generate an SCI.
0: Disable.
1: Enable.
A fixed high-to-low or low-to-high transition (debounce period) of 31 µs exists in order for GPWIO2 to be recognized.
The setting of this bit can be overridden via I/O Offset 15h[6] to force an SMI.
9
GPWIO1_EN.
Allow GPWIO1 to generate an SCI.
0: Disable.
1: Enable.
See I/O Offset 07h[3] for debounce information.
The setting of this bit can be overridden via I/O Offset 15h[5] to force an SMI.
8
GPWIO0_EN.
Allow GPWIO0 to generate an SCI.
0: Disable.
1: Enable.
See I/O Offset 07h[3] for debounce information.
The setting of this bit can be overridden via I/O Offset 15h[4] to force an SMI.
7
Reserved.
Must be set to 0
6
USB_EN.
Allow USB events to generate a SCI.
0: Disable.
1: Enable.
5
THRM_EN.
Allow THRM# to generate an SCI.
0: Disable.
1: Enable
4
SMI_EN.
Allow SMI events to generate an SCI.
0: Disable.
1: Enable.
Table 6-34. I/O Offset: ACPI Support Registers (Continued)
Bit
Description
Содержание Geode SC2200
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