Intel 4 620 JM80547PG0722MM Data Sheet
Product codes
JM80547PG0722MM
86
Datasheet
Features
6.2
Clock Control and Low Power States
The processor allows the use of AutoHALT and Stop-Grant states to reduce power consumption by
stopping the clock to internal sections of the processor, depending on each particular state. See
stopping the clock to internal sections of the processor, depending on each particular state. See
6.2.1
Normal State
This is the normal operating state for the processor.
Figure 6-1. Processor Low Power State Machine
Enhanced HALT or HALT State
BCLK running
Snoops and interrupts allow ed
Snoops and interrupts allow ed
Norm al State
Normal execution
Enhanced HALT Snoop or HALT
Snoop State
Snoop State
BCLK running
Service snoops to caches
Service snoops to caches
Stop-Grant State
BCLK running
Snoops and interrupts allow ed
Snoops and interrupts allow ed
Snoop
Event
Occurs
Snoop
Event
Serviced
INIT#, BINIT#, INTR, NMI, SMI#,
RESET#, FSB
RESET#, FSB
interrupts
STPCLK#
Asserted
Asserted
STPCLK# De-
asserted
asserted
ST
PC
LK
#
As
se
rte
d
ST
PC
LK
#
D
e-
as
se
rte
d
Snoop Event Occurs
Snoop Event Serviced
HALT or MWAIT Instruction and
HALT Bus Cycle Generated
HALT Bus Cycle Generated
Grant Snoop State
BCLK running
Service snoops to caches
Service snoops to caches