AMD manual AMD Geode SC2200 Processor Data Book 241

Core Logic Module - Bridge, GPIO, and LPC Registers - Function 0 32580B

Table 6-31. F0BAR1+I/O Offset: LPC Interface Configuration Registers (Continued)

Bit

Description

Offset 18h-1Bh		LAD_D1 — LPC Address Decode 1 Register (R/W)	Reset Value: 00000000h
31:16	Reserved. Must be set to 0.
15:9	Wide Generic Base Address Select. Defines a 512 byte space. Can be mapped anywhere in the 64 KB I/O space. AC97
	and other configuration registers are expected to be mapped to this range. It is wide enough to allow many unforeseen
	devices to be supported. Enabled at F0BAR1+I/O Offset 10h[9].

Note: The selected range must not overlap any address range that is positively decoded by F0BAR1+I/O Offset 10h bits [17], [14:10], and [8:0].

8:0	Reserved. Must be set to 0.
Offset 1Ch-1Fh		LPC_ERR_SMI — LPC Error SMI Register (R/W)	Reset Value: 00000080h
31:12	Reserved. Must be set to 0.

11LPCPD# Override Enable. Determines how LPCPD# output is controlled.

0:ACPI logic.

1:LPCPD# Override Value bit (bit 10 of this register).

10LPCPD# Override Value. Selects value of LPCPD# output if bit 11 of this register is set to 1.

0:Power down sequence.

1:Normal power.

9SMI Serial IRQ Enable. Allows serial IRQ to generate an SMI.

0:Disable.

1:Enable.

Top Level SMI status is reported at F1BAR0+I/O Offset 02h[3].

Second level status is reported at bit 6 of this register.

8SMI Configuration for LPC Error Enable. Allows LPC errors to generate an SMI.

0:Disable.

1:Enable.

Top Level SMI status is reported at F1BAR0+I/O Offset 02h[3].

Second level status is reported at bit 5 of this register.

7LPCPD# Pin Status. (Read Only) Reflects the current value of the LPCPD# output signal.

6SMI Source is Serial IRQ. Indicates whether or not an SMI was generated by an SERIRQ.

0:No.

1:Yes.

Write 1 to clear.

To enable SMI generation, set bit 9 of this register to 1.

This is the second level of status reporting. The top level status is reported in F1BAR0+I/O Offset 02h[3].

Writing a 1 to this bit also clears the top level status bit as long as bit 5 of this register is cleared.

5LPC Error Status. Indicates whether or not an SMI was generated by an error that occurred on LPC.

0:No.

1:Yes.

Write 1 to clear.

To enable SMI generation, set bit 8 of this register to 1.

This is the second level of status reporting. The top level status is reported in F1BAR0+I/O Offset 02h[3].

Writing a 1 to this bit also clears the top level status bit as long as bit 6 of this register is cleared.

4LPC Multiple Errors Status. Indicates whether or not multiple errors have occurred on LPC.

0:No.

1:Yes.

Write 1 to clear.

AMD Geode™ SC2200 Processor Data Book 241