Power Management Controller Zero-Volt State Transition
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Solution Overview
Problem
Existing CPU power management protocols, such as ACPI, are inefficient in eliminating static power consumption, especially in advanced CPU manufacturing processes, as they do not completely eliminate static power components, limiting the efficiency of low-power states like C1-C5.
Innovation Solution
A method for transitioning processing units to a zero-volt (C6) state by monitoring active and non-active state residency, DMA transfer activity, I/O processes, and timer-tick intervals to determine the feasibility of transitioning to a low-power or zero-volt state, allowing efficient power management and reduced overall power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If CPU transitions to low-power states (C1-C5) using ACPI protocol, then dynamic power consumption is eliminated and static power is reduced, but static power components are not completely eliminated limiting efficiency in advanced manufacturing processes
Solution Approach 1:
The patent transitions the CPU to a zero-volt state (C6) by fundamentally changing the voltage parameter from operational levels to 0V, completely eliminating both dynamic and static power consumption. This parameter change enables complete power elimination rather than just reduction, resolving the limitation of ACPI-based low-power states that could not fully eliminate static power in advanced manufacturing processes
Solution Approach 2:
The patent implements monitoring of active-state residency, non-active-state residency, DMA transfer activity, I/O processes, and timer-tick intervals before transitioning to the zero-volt state. This preliminary monitoring ensures all necessary conditions are met before power elimination, preventing premature transitions that would compromise system reliability while enabling maximum power savings when conditions are appropriate
2Reliability
If monitoring multiple parameters (active-state residency, non-active-state residency, DMA activity, I/O processes, timer-tick intervals) is implemented, then accurate decision making for power state transition is achieved, but system complexity increases
Solution Approach 1:
The patent employs a single monitoring module that universally tracks multiple parameters including active-state residency, non-active-state residency, DMA transfer activity, I/O processes, and timer-tick intervals. This multi-functional approach consolidates what would otherwise require separate monitoring mechanisms into one unified system, achieving comprehensive monitoring without proportionally increasing complexity
Solution Approach 2:
The monitoring system continuously tracks system state parameters and provides feedback to the power management logic, enabling dynamic decision-making for transitions to and from the zero-volt state. This feedback mechanism ensures transitions occur only when appropriate conditions are met, maintaining system reliability while the integrated monitoring approach keeps complexity manageable
Data Source
AI summary
A power management controller (PMC) that interfaces with a processor comprising one or more cores. The PMC may be configured to communicate with each respective core, such that microcode executed by the respective processor core may recognize when a request is made to transition the respective core to a target power-state. For each respective core, the state monitor may monitor active-state residency, non-active-state residency, Direct Memory Access (DMA) transfer activity associated with the respective core, Input/Output (I/O) processes associated with the respective core, and the value of a timer-tick (TT) interval associated with the respective core. The status monitor may derive respective status information for the respective core based on the monitoring and indicate whether the respective core should be allowed to transition to the corresponding target power-state. The PMC may transition the respective processor core to the corresponding target power-state accordingly.