Intel Pga478 - P4-2ghz 512kb 400mhz Fsb Datasheet page 14

is not altered; only the internal core frequency is changed. When entering the low
power state, the processor first switches to the lower bus to core frequency ratio and
then transition to the lower voltage (VID).
While in the Extended HALT(C1E) state, the processor processes bus snoops. The
processor exits the Extended HALT state when a break event occurs. When the
processor exits the Extended HALT state, it first transitions the VID to the original value
and then changes the bus to core frequency ratio back to the original value.
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Intel Celeron Processor 1.66 GHz/1.83 GHz
DS
14
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Intel Celeron Processor 1.66 GHz/1.83 GHz—Low Power Features
January 2007
Order Number: 315876-002