AMD SB600 Technical Reference Manual page 168

Field Name
ThrottleControl
ThermThrotPeriod
Reserved
PllRstEn
(available after A13)
ThermThrotCntl register
Field Name
LSCmd
Reserved
LdtStpCmd register
Field Name
LdtStartTime
LdtStartTime register for ACPI C state in the K8 system.
Field Name
AgpStartTime
AgpStartTime register for ACPI C state in the K8 system.
Field Name
LdtEndTime
Reserved
VfidTime
StutterMode
©2008 Advanced Micro Devices, Inc.
AMD SB600 Register Reference Manual
ThermThrotCntl – RW – 8 bits – [PM_Reg:86h]
Bits Default
4:1 0000b Bit[4] Enable thermal clock throttle
Bit[3:1] Throttle interval for STPCLK# de-assertion
000b: 50%
001b: 12.5%
010b: 25%
011b: 37.5%
100b: 50%
101b: 62.5%
110b: 75%
111b: 87.5%
5 0b Selects the thermal clock throttle period
0: 30us
1: 244us
6 0b
7 0b Resets PLL whenever the system gets reset.
LdtStpCmd – RW – 8 bits – [PM_Reg:87h]
Bits Default
0 0b Write 1 to generate VID/FID change sequence with C3
STPCLK# message
7:1 00h
LdtStartTime – RW – 8 bits – [PM_Reg:88h]
Bits Default
7:0 00h LDTSTP# assertion delay in 1us increment
AgpStartTime – RW – 8 bits – [PM_Reg:89h]
Bits Default
7:0 00h AGP_STP# assertion delay in 1us increment
LdtAgpTimeCntl – RW – 8 bits – [PM_Reg:8Ah]
Bits Default
1:0 00b LDTSTP# de-assertion delay select
00: 0µs
01: 1µs
10: 32µs
11: 64µs
3:2 00b
6:4 000b VID/FID LDTSTP# duration select
000: 1µs
001: 2µs
010: 4µs
011: 8µs
100: 16µs
101: 32µs
110: 64µs
111: 128µs
7 0b Set to 1 to enable stutter mode
Description
Description
Description
Description
Description
SMBus Module and ACPI Block (Device 20, Function 0)
Proprietary Page 168