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| 型號(hào)： | BX80551PG3000FN |
| 廠商： | INTEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 32-BIT, 3000 MHz, MICROPROCESSOR, PBGA775 |
| 封裝： | FLIP CHIP, LGA-775 |
| 文件頁數(shù)： | 92/106頁 |
| 文件大?。?/td> | 2713K |
| 代理商： | BX80551PG3000FN |
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86
Datasheet
Features
6.2.1
Normal State
This is the normal operating state for the processor.
6.2.2
HALT and Enhanced HALT Powerdown States
The Pentium D processor supports the HALT or Enhanced HALT powerdown state. The Enhanced
HALT Powerdown state is configured and enabled via the BIOS. The Enhanced HALT state is a
lower power state as compared to the Stop Grant State. If Enhanced HALT is not enabled, the
default Powerdown state entered will be HALT. Refer to the sections below for details about the
HALT and Enhanced HALT states.
6.2.2.1
HALT Powerdown State
HALT is a low power state entered when all the logical processors have executed the HALT or
MWAIT instructions. When one of the logical processors executes the HALT instruction, that
logical processor is halted; however, the other processor continues normal operation. The processor
will transition to the Normal state upon the occurrence of SMI#, BINIT#, INIT#, or LINT[1:0]
(NMI, INTR). 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 HALT Power Down state. See the Intel Architecture Software Developer's Manual, Volume III:
System Programmer's Guide for more information.
Figure 6-1. Processor Low Power State Machine
Enhanced HALT or HALT State
BCLK running
Snoops and interrupts allowed
Normal State
Normal execution
Enhanced HALT Snoop or HALT
Snoop State
BCLK running
Service snoops to caches
Stop-Grant State
BCLK running
Snoops and interrupts allowed
Snoop
Event
Occurs
Snoop
Event
Serviced
INIT#, BINIT#, INTR, NMI, SMI#,
RESET#, FSB interrupts
STPCLK#
Asserted
STPCLK#
De-asserted
S
TP
C
LK
#
A
ss
er
te
d
S
TP
C
LK
#
D
e-
as
se
rte
d
Snoop Event Occurs
Snoop Event Serviced
HALT or MWAIT Instruction and
HALT Bus Cycle Generated
Grant Snoop State
BCLK running
Service snoops to caches
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