參數(shù)資料
型號(hào)： AMDOPTERON
英文描述： AMD Opteron - AMD Opteron Processor Data Sheet
中文描述： AMD Opteron處理器- AMD Opteron處理器的數(shù)據(jù)資料
文件頁(yè)數(shù)： 21/81頁(yè)
文件大?。?/td> 1189K
代理商： AMDOPTERON
Chapter 3
Power Management
21
23932 Rev 3.00 April 2003
AMD Opteron
Processor Data Sheet
3
Power Management
The AMD Opteron
processor provides the following power management features designed to be
compliant with the Advanced Configuration and Power Interface (ACPI) Specification and
HyperTransport
technology:
Halt state with associated programmable power savings
STPCLK/Stop Grant protocol capable of supporting eight distinct versions of Stop Grant
LDTSTOP_L signal support
Memory controller and host bridge power management
Voltage plane isolation based upon PWROK signal
Low-power state while RESET_L signal is asserted
On-die thermal diode
Table 4 maps processor capabilities to ACPI states.
3.1
Halt
When the HLT instruction is executed, the processor stops program execution and issues a Halt
special cycle. The power savings associated with the Halt state are determined by configuration
registers in the processor (refer to the
BIOS and Kernel Developer
’
s Guide for the AMD Athlon
64
and AMD Opteron
Processors
,
order# 26094, for details of these configuration registers). The CPU
clock grid frequency can be divided down in the absence of probe activity that would force the
processor caches to be snooped.
The CPU clock grid is automatically brought to full frequency when probe activity is present and
returned to the low-power state when probe activity ceases.
Table 4.
Processor Capabilities Mapped to ACPI States
ACPI State
Processor
C1
Halt
Passive Cooling
Passive Cooling is supported by Stop Grant (throttling).
S1
Stop Grant. In response to LDTSTOP_L assertion, memory is placed in self-refresh
mode and the host bridge and memory controller are placed into a low-power state.
S3
Processor core and HyperTransport
technology voltage planes are not powered.
DDR SDRAM interface remains powered and holds memory in self-refresh mode.
S4, S5, G3
All power is removed from the processor.
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