SYSTEM, METHOD AND APPARATUS FOR HANDLING POWER LIMIT RESTRICTIONS IN FLASH MEMORY DEVICES

• US 20140100838A1
• Filed: 03/14/2013
• Published: 04/10/2014
• Est. Priority Date: 10/10/2012
• Status: Active Grant

• Current Assignee: SanDisk Technologies LLC (Western Digital Corporation)
• Original Assignee: Sandisk Technologies Incorporated (Western Digital Corporation)
• Inventors: Stelmakh, Konstantin
• Granted Patent: US 9,235,665 B2
• Time in Patent Office: Days
• US Class Current: 703/21
• CPC Class Codes: G06F 1/3206 Monitoring of events, devices or parameters that trigger a change in power modality
• CPC Class Codes: G06F 1/3275 Power saving in memory, e.g. RAM, cache
• CPC Class Codes: G06F 30/33 Design verification, e.g. functional simulation or model checking
• CPC Class Codes: Y02D 10/00 Energy efficient computing, e.g. low power processors, power management or thermal management

Abstract

A system, method and apparatus for dynamic power management including creating a model for each task of multiple tasks performed by a circuit, the model including a corresponding power requirement value for each task, selecting each task for execution, executing the selected task when the corresponding power requirement value does not exceed an average power consumption cap of an execution window, determining an actual power consumption of the selected task during execution of the selected task and storing the actual power consumption corresponding to the selected task as the corresponding power requirement value for the selected task. A memory system can include a memory die, a data bus coupled to the memory die, a power supply coupled to the memory die, a power monitor coupled to the memory die and the power supply and a controller coupled to the data bus and the memory die.

Claims

1. A method for dynamic power management comprising:

creating a model for each task of a plurality of tasks performed by a circuit, the model including a corresponding power requirement value for each task of the plurality of tasks;

selecting each task of the plurality of tasks for execution;

executing the selected task when the corresponding power requirement value does not exceed an average power consumption cap of an execution window;

determining an actual power consumption of the selected task during execution of the selected task; and

storing the actual power consumption corresponding to the selected task as the corresponding power requirement value for the selected task.

2. The method of claim 1, wherein creating the model for each task of the plurality of tasks includes storing the model of each of the plurality of tasks in a reference table.

3. The method of claim 2, wherein creating the model for each task of the plurality of tasks includes:

selecting one of the tasks of the plurality of tasks;

determining an estimated maximum power requirement of the selected task;

assigning a task identifier corresponding to the selected task; and

storing the task identifier and the estimated maximum power requirement corresponding to the selected task in a reference table, the corresponding estimated maximum power requirement value being stored in the corresponding power requirement value in the reference table.

4. The method of claim 3, wherein the estimated maximum power requirement includes a worst case execution power requirement.

5. The method of claim 1, wherein the execution window includes a selected duration.

6. The method of claim 1, wherein the average power consumption cap of the execution window includes a sum of the power consumed by each one of the plurality of tasks executed within the execution window.

7. The method of claim 1, wherein storing the actual power consumption corresponding to the selected task in the corresponding power requirement value includes storing the actual power consumption corresponding to the selected task in the corresponding power requirement value for every iteration of a plurality of iterations of the selected task.

8. The method of claim 1, wherein determining the actual power consumption of the selected task during execution of the selected task includes determining the actual power consumption due to at least one of an actual workload, an actual age, an actual temperature of the circuit performing the task.

9. The method of claim 1, further comprising delaying execution of the selected task when the corresponding power requirement field value exceeds the average power consumption cap of the execution window.

10. The method of claim 1, wherein at least one of the plurality of tasks is a memory task.

11. The method of claim 1, wherein at least one of the plurality of tasks is a controller task.

12. The method of claim 1, wherein the plurality of tasks includes at least one a memory task and at least one controller task.

13. The method of claim 1, wherein the execution window is a sliding execution window.

14. A memory system comprising:

a memory die;

a data bus coupled to the memory die;

a power supply coupled to the memory die;

a power monitor coupled to the memory die and the power supply;

a controller coupled to the data bus and the memory die; and

a dynamic power consumption model for each one of a plurality of tasks stored in a computer readable medium and being accessible by the controller, the controller including logic embodied in a computer readable medium to monitor the execution of each task and logic embodied in a computer readable medium to update an actual power consumed by the executed task in the dynamic corresponding power consumption model.

15. The memory system of claim 14, wherein the controller is included on the memory die.

16. The memory system of claim 14, wherein the controller further includes:

logic embodied in a computer readable medium for creating a model for each task of the plurality of tasks performed by the memory system, the model including a corresponding power requirement value for each task of the plurality of tasks;

logic embodied in a computer readable medium for selecting each task of the plurality of tasks for execution; and

logic embodied in a computer readable medium for executing the selected task when the corresponding power requirement value does not exceed an average power consumption cap of an execution window.

17. The system of claim 14, wherein at least one of the plurality of tasks is a flash task.

18. The system of claim 14, wherein at least one of the plurality of tasks is a controller task.

19. The system of claim 14, wherein the plurality of tasks includes at least one a flash task and at least one controller task.