AMD SB600 User Manual
Page 109
©2008 Advanced Micro Devices, Inc.
SMBus Module and ACPI Block (Device 20, Function 0)
AMD SB600 Register Reference Manual
Proprietary
Page 109
UsbEnable - RW - 8 bits - [PCI_Reg: 68h]
Field Name
Bits
Default
Description
OHCI_2_enable
3
1b
Set to 1 to enable OHCI_2
OHCI_3_enable
4
1b
Set to 1 to enable OHCI_3
OHCI_4_enable
5
1b
Set to 1 to enable OHCI_4
Reserved 7:6
00b
UsbEnable register
SeriallrqControl- RW - 8 bits - [PCI_Reg: 69h]
Field Name
Bits
Default
Description
NumStartBits
1:0
00b
This field defines the number of clocks in the start frame.
Start Frame Width = 4 + 2 * NumStartBits
NumSerIrqBits
5:2
0h
Total number of serial IRQ's = 17 + NumSerIrqbits
0 - 17 serial IRQ's (15 IRQ, SMI#, + IOCHK#)
1 - 18 serial IRQ's (15 IRQ, SMI#, IOCHK#, INTA#)
...
15 - 32 serial IRQ's
The SB600 serial IRQ can support 15 IRQ#, SMI#, IOCHK#,
INTA#, INTB#, INTC#, and INTD#.
When serial SMI# is used, BIOS will need to check SIO (or
device that generates serial SMI#) for status.
SerIrqMode
6
0b
0 - Continuous mode
1 - Active (quiet) mode
SerialIrqEnable
7
0b
Setting this bit to 1 enable the serial IRQ function
SeriallrqControl register
RTCProtect- RW - 8 bits - [PCI_Reg: 6Ah]
Field Name
Bits
Default
Description
RTCProtect38_3F
0
0b
When set, RTC RAM index 38:3Fh will be locked from
read/write. This bit can only be written once.
RTCProtectF0_FF
1
0b
When set, RTC RAM index F0:FFh will be locked from
read/write. This bit can only be written once.
RTCProtectE0_EF
2
0b
When set, RTC RAM index E0:EFh will be locked from
read/write. This bit can only be written once.
RTCProtectD0_DF
3
0b
When set, RTC RAM index D0:DFh will be locked from
read/write. This bit can only be written once.
RTCProtectC0_CF
4
0b
When set, RTC RAM index C0:CFh will be locked from
read/write. This bit can only be written once.
Reserved 7:5
000b
RTCProtect register
USB Reset- RW - 8 bits - [PCI_Reg: 6Bh]
Field Name
Bits
Default
Description
Force Reset to USB Host
Controllers
4:0
00h
These are software control bits that force the reset of the USB
host controllers.
Force USB Port PHY
Power Down
5
0b
Forces USB PHY into power down mode.
Force PHY PLL Power
Down
6
0b
Forces USB PHY PLL into power down mode.
Force USB Port PHY
Reset
7
0b
Forces USB PHY reset.
USB Reset register