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©2008 Advanced Micro Devices, Inc.
SMBus Module and ACPI Block (Device 20, Function 0)
AMD SB600 Register Reference Manual Proprietary Page 107
MiscEnable- RW - 8 bits - [PCI_Reg: 62h]
Field Name Bits Default Description
USB_Fast_SMI_Disable 5 0b For K8 system, legacy USB can request SMI# to be sent out
early before IO completion. Some applications may have
problem with this feature. BIOS should set this bit to 1 to
disable the feature.
Reserved 6 0b
IDE_GPIO_Enable 7 0b If this bit is set to 1, the IDE bus is configured as GPIO
MiscEnable register
AzIntMap- RW - 8 bits - [PCI_Reg: 63h]
Field Name Bits Default Description
AzIntMap 2:0 110b Interrupt routing table for HD Audio. Setting this register
routes the HD audio’s interrupt to the specific PCI interrupt
before it is routed to the interrupt controller
000 – INTA#
001 – INTB#
010 – INTC#
011 – INTD#
100 – INTE#
101 – INTF#
110 – INTG#
111 – INTH#
Reserved 7:3 00000b
Features Enable- RW - 32 bits - [PCI_Reg: 64h]
Field Name Bits Default Description
PIC_Enable
0 1b PIC (8259) Programmable Interrupt Controller enable
0 - I/O cycles to master PIC:20,21, slave PIC:a0, a1, ELCR
registers 4D0, 4D1h, and the PCI interrupt Mapping Registers
(C00, C01), and Numberic Coprocessor Error Register
(IRQ13) (0F0h) are not accepted.
1 - (default) I/O cycles to APIC are not decoded but I/O cycles
to these above addresses will be positive decoded on PCI and
run to the internal 8259 PIC
Timer_Enable 1 1b 0 – I/O cycles to timers/counter (040-043h) will not be claimed
on ISA
1 – I/O cycles to timers/counter will be claimed on ISA and run
to the internal 8254 Timer/Counter
PMIO_Register Enable
2 1b Power management enable register
0 – I/O cycles to Power management registers (CD6 and
CD7h) will not be claimed
1 – I/O cycles to Power management registers will be claimed
and run to the internal Power Management logic (BIOS should
always set it to 1)
Ioapic_enable 3 0b When set, this block will decode ioapic address
CheckOwnReq 4 0b If set, the SB600 will check its own REQ# as the PCI_ACTIVE
signal in addition to BMREQ#
BmReqEn 5 0b BMREQ# enable
Reserved 6 0b
XIOAPIC_ENA 7 1b XIOAPIC enable; this bit is only valid if bit 3 is set.
GEVENT5_ENA 8 0b BIOS should always set this bit to 1 to enable GEVENT5.
Ext_KBRST_EnB 9 0b Enable external KB_RST# input. When set to 0, GEVENT[1]
is used as KBRST# input
MultiMediaTimerIrqEn 10 0b High Precision Event Timer (also called Multimedia Timer)
interrupt enable
Ext_A20En 11 0b Enable external Ga20In input. When set to 1, GEVENT[0] is
used as Ga20In input