Integrated power and thermal management in non-volatile memory
A non-volatile storage device comprises non-volatile memory cells, clocked circuity, and one or more control circuits. The one or more control circuits are configured to process commands to access the non-volatile memory cells using the clocked circuity, implement a power control loop to regulate power consumption of the non-volatile storage device based on a first feedback signal, implement a temperature control loop to regulate temperature of the non-volatile storage device based on a second feedback signal, and implement a clock frequency control loop to regulate one or more clock frequencies of the clocked circuitry based on a third feedback signal.
1. A non-volatile storage device, comprising:
non-volatile memory cells;
clocked circuitry; and
one or more control circuits configured to:
process commands to access the non-volatile memory cells using the clocked circuitry;
implement a power control loop to regulate power consumption of the non-volatile storage device based on a first feedback signal, the power control loop having a first update rate;
implement a clock frequency control loop to regulate one or more clock frequencies of the clocked circuitry based on a second feedback signal, the clock frequency control loop having a second update rate that is slower than the first update rate; and
implement a temperature control loop to regulate temperature of the non-volatile storage device based on a third feedback signal, the temperature control loop having a third update rate that is slower than the second update rate.
2. The non-volatile storage device of claim 1 , wherein:
the power control loop is a closed loop having a first bandwidth;
the clock frequency control loop is a closed loop having a second bandwidth that is smaller than the first bandwidth; and
the temperature control loop is a closed loop having a third bandwidth that is smaller than the second bandwidth.
3. The non-volatile storage device of claim 1 , wherein:
the power control loop has a target power as a reference input, a measured power as the first feedback signal, and power credits as a control output; and
the temperature control loop has a measured temperature as the third feedback signal, and the target power as a control output.
4. The non-volatile storage device of claim 3 , wherein:
the one or more control circuits are further configured to process the commands in response to having a sufficient amount of the power credits; and
the clock frequency control loop has a command backlog as the second feedback signal, and the one or more clock frequencies as a control output.
5. The non-volatile storage device of claim 3 , wherein:
the one or more control circuits are further configured to process the commands in response to having a sufficient amount of the power credits; and
the clock frequency control loop has a size of a pool of the power credits as the second feedback signal, and the one or more clock frequencies as a control output.
6. The non-volatile storage device of claim 1 , wherein:
the one or more control circuits are further configured to perform correction for one or more of the power control loop, the temperature control loop or the clock frequency control loop based on an estimated time of arrival (ETA) of when a measurement of the feedback signal for the respective control loop is estimated to reach a target value.
7. The non-volatile storage device of claim 1 , wherein the one or more control circuits are further configured to:
set the one or more clock frequencies to an idle level to save power responsive to a backlog of the commands being below a threshold, wherein the clocked circuitry remain fully functional when operating at the idle level.
8. The non-volatile storage device of claim 7 , wherein the one or more control circuits are further configured to:
change the one or more clock frequencies from the idle level to a full speed level in response to detection of a user operation with respect to the non-volatile storage device.
9. A method of operating a non-volatile storage device comprising non-volatile memory cells, the method comprising:
operating one or more processors to execute commands to access the non-volatile memory cells;
regulating power usage in the non-volatile storage device based on a target power level while operating the one or more processors, including issuing power credits to execute the commands;
limiting operating temperature of the non-volatile storage device to below a threshold temperature, including establishing the target power level; and
reducing a frequency of one or more clock signals of the one or more processors in response to an increase of backlog of the commands.
10. The method of claim 9 , wherein:
regulating the power usage comprises updating the power credits at a first rate;
regulating the frequency of the one or more clock signals comprises updating the one or more clock frequencies at a second rate that is slower than the first rate; and
regulating the operating temperature comprises updating the target power level at a third rate that is less than the second rate.
11. The method of claim 9 , wherein regulating the power usage comprises:
providing pre-emptive correction based on an estimate of when the power usage will reach a target power, including reducing a slope of the power usage over time to produce a soft landing of the power usage at the target power.
12. The method of claim 9 , further comprising:
setting the frequency of the one or more clock signals of the one or more processors to an idle level to save power responsive to a backlog of the commands being below a threshold, including suppressing one or more pulses of the one or more clock signals, wherein the one or more processors remain fully functional when operating at the idle level.
13. The method of claim 12 , further comprising:
changing the frequency of the one or more clock signals from the idle level to a full speed level in response to detection of a user operation, including removing the suppression of the one or more pulses of the one or more clock signals.
14. A non-volatile storage device, comprising:
non-volatile memory cells; and
a non-volatile memory controller comprising one or more processors, the non-volatile memory controller comprising:
means for processing commands to access the non-volatile memory cells;
means for controlling power usage of the non-volatile storage device using a first closed control loop having a first bandwidth;
means for controlling operating frequencies of the one or more processors using a second closed control loop having a second bandwidth that is less than the first bandwidth; and
means for controlling operating temperature of the non-volatile storage device using a third closed control loop having a third bandwidth that is less than the second bandwidth.
15. The non-volatile storage device of claim 14 , wherein the non-volatile memory controller is configured to:
control the power usage of the non-volatile storage device based on a user supplied target power level as a default; and
control the power usage of the non-volatile storage device based on a target power level that is based on the operating temperature in response to the operating temperature of the non-volatile storage device exceeding a threshold.
16. The non-volatile storage device of claim 14 , wherein the non-volatile memory controller is configured to:
delay processing of commands to access the non-volatile memory cells to control the power usage of the non-volatile storage device to a target power level; and
reduce the target power level to reduce the operating temperature of the non-volatile storage device.
17. The non-volatile storage device of claim 16 , wherein the non-volatile memory controller is configured to:
reduce operating frequencies of one or more processors of the non-volatile storage device in response to a backlog of the commands; and
continue to process the commands to access the non-volatile memory cells after reducing the operating frequencies of the one or more processors.
18. The non-volatile storage device of claim 14 , wherein the non-volatile memory controller is configured to:
control one of more of the power usage, the operating temperature or the operating frequencies of the one or more processors based on an estimated time of arrival (ETA) of when a feedback measurement will reach a target value.
19. The non-volatile storage device of claim 14 , wherein the non-volatile memory controller is configured to:
set the operating frequencies of the one or more processors to an idle level to save power responsive to a backlog of the commands being below a threshold, wherein the idle level is a fully functional mode of operation of the non-volatile storage device; and
change the operating frequencies from the idle level to a full speed level in response to detection of a user operation.