Specification Sheet

Datasheet, Volume 1 of 2 71
Power Management
• The other processor IA cores are in a C3 or deeper power state, and the processor
has been granted permission by the platform.
• The platform has not granted a request to a package C6/C7 state or deeper state
but has allowed a package C3 state.
In package C3-state, the LLC shared cache is valid.
Package C6 State
A processor enters the package C6 low-power state when:
• At least one processor IA core is in the C6 state.
• The other processor IA cores are in a C6 or deeper power state, and the processor
has been granted permission by the platform.
• The platform has not granted a package C7 or deeper request but has allowed a C6
package state.
In package C6 state, all processor IA cores have saved their architectural state and
have had their voltages reduced to zero volts. It is possible the LLC shared cache is
flushed and turned off in package C6 state.
Package C7 State
The processor enters the package C7 low-power state when all processor IA cores are
in the C7 or deeper state and the operating system may request that the LLC will be
flushed.
Processor IA core break events are handled the same way as in package C3 or C6.
Upon exit of the package C7 state, the LLC will be partially enabled once a processor IA
core wakes up if it was fully flushed, and will be fully enabled once the processor has
stayed out of C7 for a preset amount of time. Power is saved since this prevents the
LLC from being re-populated only to be immediately flushed again. Some VRs are
reduce to 0V.
Package C8 State
The processor enters C8 states when the processor IA cores lower numerical state is
C8.
The C8 state is similar to C7 state, but in addition, the LLC is flushed in a single step,
Vcc and Vcc
GT
are reduced to 0V. The display engine stays on.
InstantGo
InstantGo is a platform state. On display time out the OS requests the processor to
enter package C10 and platform devices at RTD3 (or disabled) in order to attain low
power in idle.
Dynamic LLC Sizing
When all processor IA cores request C7 or deeper C-state, internal heuristics
dynamically flushes the LLC. Once the processor IA cores enter a deep C-state,
depending on their MWAIT sub-state request, the LLC is either gradually flushed N-
ways at a time or flushed all at once. Upon the processor IA cores exiting to C0 state,
the LLC is gradually expanded based on internal heuristics.