參數(shù)資料
型號(hào)： RH80532NC021256
元件分類： 微處理器
英文描述： Microprocessor
中文描述： 微處理器
文件頁數(shù)： 89/93頁
文件大?。?/td> 2353K
代理商： RH80532NC021256
Mobile Intel
Pentium
4 Processor-M
250686-002
Datasheet
89
7.
Configuration and Low Power Features
7.1
Power-On Configuration Options
Several configuration options can be configured by hardware. The Mobile Intel Pentium 4
Processor-M samples its hardware configuration at reset, on the active-to-inactive transition of
RESET#. For specifications on these options, please refer to
Table 40
.
The sampled information configures the processor for subsequent operation. These configuration
options cannot be changed except by another reset. All resets reconfigure the processor.
NOTE:
Asserting this signal during RESET# will select the corresponding option.
7.2
Clock Control and Low Power States
The use of AutoHALT, Stop-Grant, Sleep, Deep Sleep and Deeper Sleep states is allowed in
Mobile Intel Pentium 4 Processor-M based systems to reduce power consumption by stopping the
clock to internal sections of the processor, depending on each particular state. See
Figure 35
for a
visual representation of the processor low-power states.
7.2.1
Normal State
This is the normal operating state for the processor.
7.2.2
AutoHALT Powerdown State
AutoHALT is a low-power state entered when the processor executes the HALT instruction. The
processor will transition to the Normal state upon the occurrence of SMI#, BINIT#, INIT#,
LINT[1:0] (NMI, INTR), or PSB interrupt message. RESET# will cause the processor to
immediately initialize itself.
The return from a System Management Interrupt (SMI) handler can be to either Normal Mode or
the AutoHALT Powerdown state. See the
Intel
Volume III: System Programmer's Guide
for more information.
Architecture Software Developer's Manual,
Table 40. Power-On Configuration Option Pins
Configuration Option
Pin
1
Output tristate
SMI#
Execute BIST
In Order Queue pipelining (set IOQ depth to 1)
Disable MCERR# observation
INIT#
A7#
A9#
Disable BINIT# observation
APIC Cluster ID (0-3)
Disable bus parking
A10#
A[12:11]#
A15#
Symmetric agent arbitration ID
BR0#
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