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AMD Geode™ SC2200 Processor Data Book
229
Core Logic Module - Bridge, GPIO, and LPC Registers - Function 0
32580B
1
Floppy Disk Access Trap SMI Status.
Indicates whether or not an SMI was caused by a trapped I/O access to the floppy
disk.
0: No.
1: Yes.
To enable SMI generation, set F0 Index 82h[1] = 1.
0
Primary Hard Disk Access Trap SMI Status.
Indicates whether or not an SMI was caused by a trapped I/O access to the
primary hard disk.
0: No.
1: Yes.
To enable SMI generation, set F0 Index 82h[0] = 1.
Index F7h
Second Level PME/SMI Status Register 4 (RC)
Reset Value: 00h
The bits in this register contain second level status reporting. Top level status is reported in I/O Offset 00h/02h[0].
Reading this register clears the status at both the second and top levels except for bit 7 which has a third level of status reporting at
I/O 0Ch/1Ch.
A read-only “Mirror” version of this register exists at F0 Index 87h. If the value of the register must be read without clearing the SMI
source (and consequently de-asserting SMI), F0 Index 87h can be read instead.
7
GPIO Event SMI Status (Read Only, Read does not Clear).
Indicates whether or not an SMI was caused by a transition of
any of the GPIOs (GPIO47-GPIO32 and GPIO15-GPIO0).
0: No.
1: Yes.
To enable SMI generation, set I/O Offset 0Ch[0] = 0.
I/O Offset 08h/18h selects which GPIOs are enabled to generate a PME and setting I/O Offset 0Ch[0] =
0 enables the PME to generate an SMI. In addition, the selected GPIO must be enabled as an input (I/O Offset
20h and 24h).
The next level (third level) of SMI status is at I/O 0Ch/1Ch.
6
Thermal Override SMI Status.
Indicates whether or not an SMI was caused by an assertion of the THRM#.
0: No.
1: Yes.
To enable SMI generation set F0 Index 83h[4] = 1.
5:4
Reserved.
Read as 0.
3
SIO PWUREQ SMI Status.
Indicates whether or not an SMI was caused by a power-up event from the SIO.
0: No.
1: Yes.
A power-up event is defined as any of the following events/activities:
— RI2#.
— SDATA_IN2.
— IRRX1 (CEIR).
To enable SMI generation, set I/O Offset 0Ch[0] = 0.
2
Codec SDATA_IN SMI Status.
Indicates whether or not an SMI was caused by AC97 Codec producing a positive edge on
SDATA_IN.
0: No.
1: Yes.
To enable SMI generation, set F0 Index 80h[5] = 1.
1
RTC Alarm (IRQ8#) SMI Status.
Indicates whether or not an SMI was caused by an RTC interrupt.
0: No.
1: Yes.
This SMI event can only occur while in 3V Suspend and an RTC interrupt occurs and I/O Offset 0Ch[0] = 0.
Table 6-29. F0: PCI Header/Bridge Configuration Registers for GPIO and LPC Support (Continued)
Bit
Description
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