Arbitration techniques for managed memory
Devices and techniques for arbitrating operation of memory devices in a managed NAND memory system to conform the operation to a power budget. In an example, a method can include enabling a subset of memory die of a memory system having multiple memory die, starting an active timer for each active memory die, initializing execution of a buffered memory command at each active die based on a timestamp associated with the buffered memory command, and disabling a first memory die of the subset of memory die when the active timer for the first die expires to maintain compliance with a power budget of the memory system.
1. A memory system comprising:
a controller configured to:
receive a first memory request for a first die of multiple memory die of the memory system;
determine that the first die is disabled;
responsive to a determination that the first die is disabled, store the first memory request into a first queue and record a timestamp that identifies a time at which the first memory request was added to the first queue;
determine, based upon the timestamp, that the first memory request has been in the first queue more than a specified threshold duration;
responsive to a determination that the first memory request has been in the first queue more than the specified threshold amount of time, disable a second die in the multiple memory die, the second die an enabled die that is a longest enabled die in the multiple memory die; and
responsive to disabling the second die, enable the first die, and process the first memory request on the first die.
2. The memory system of claim 1 , wherein the controller is configured to disable the second die by switching the second die to a low power mode.
3. The memory system of claim 1 , wherein the controller is further configured to:
set an enable timer for the first die upon enabling the first die;
subsequent to execution of the first memory request, execute additional requests in the first queue for the first die until the enable timer expires; and
upon expiry of the enable timer, disable the first die and enable another one of the multiple die.
4. The memory system of claim 1 , wherein the controller is configured to disable the second die by de-energizing the second die.
5. The memory system of claim 1 , wherein the controller is further configured to:
process the first memory request on the first die by being configured to:
split the first memory request into a first set of first multiple components;
split a second memory request for a third die into a second set of second multiple components, each component of the first and second sets having a corresponding power consumption;
selecting a first component of the first set and a second component of the second set such that a sum of the corresponding power consumption of the first and second components is below a power budget; and
executing the first component and the second component in parallel.
6. The memory system of claim 5 , wherein the first memory request is a read operation and the first set of first multiple components comprises a sense component and a read transfer component.
7. The memory system of claim 5 , wherein the first memory request is a write operation and the first set of first multiple components comprises a write transfer component and a program component.
8. A method comprising:
receiving a first memory request for a first die of multiple memory die of a memory system;
determining that the first die is disabled;
responsive to a determination that the first die is disabled, storing the first memory request into a first queue and record a timestamp that identifies a time at which the first memory request was added to the first queue;
determining, based upon the timestamp, that the first memory request has been in the first queue more than a specified threshold duration;
responsive to a determination that the first memory request has been in the first queue more than the specified threshold amount of time, disabling a second die in the multiple memory die, the second die an enabled die that is a longest enabled die in the multiple memory die; and
responsive to disabling the second die, enabling the first die, and process the first memory request on the first die.
9. The method of claim 8 , wherein the method further comprises disabling the second die by switching the second die to a low power mode.
10. The method of claim 8 , wherein the method further comprises:
setting an enable timer for the first die upon enabling the first die;
subsequent to execution of the first memory request, executing additional requests in the first queue for the first die until the enable timer expires; and
upon expiry of the enable timer, disabling the first die and enable another one of the multiple die.
11. The method of claim 8 , wherein the method further comprises disabling the second die by de-energizing the second die.
12. The method of claim 8 , wherein the method further comprises:
processing the first memory request on the first die by:
splitting the first memory request into a first set of first multiple components;
splitting a second memory request for a third die into a second set of second multiple components, each component of the first and second sets having a corresponding power consumption;
selecting a first component of the first set and a second component of the second set such that a sum of the corresponding power consumption of the first and second components is below a power budget; and
executing the first component and the second component in parallel.
13. The method of claim 12 , wherein the first memory request is a read operation and the first set of first multiple components comprises a sense component and a read transfer component.
14. The method of claim 12 , wherein the first memory request is a write operation and the first set of first multiple components comprises a write transfer component and a program component.
15. A non-transitory machine-readable medium, storing instructions, which when executed by a machine, causes the machine to perform operations comprising:
receiving a first memory request for a first die of multiple memory die of a memory system;
determining that the first die is disabled;
responsive to a determination that the first die is disabled, storing the first memory request into a first queue and record a timestamp that identifies a time at which the first memory request was added to the first queue;
determining, based upon the timestamp, that the first memory request has been in the first queue more than a specified threshold duration;
responsive to a determination that the first memory request has been in the first queue more than the specified threshold amount of time, disabling a second die in the multiple memory die, the second die an enabled die that is a longest enabled die in the multiple memory die; and
responsive to disabling the second die, enabling the first die, and process the first memory request on the first die.
16. The non-transitory machine-readable medium of claim 15 , wherein the operations further comprise disabling the second die by switching the second die to a low power mode.
17. The non-transitory machine-readable medium of claim 15 , wherein the operations further comprise:
setting an enable timer for the first die upon enabling the first die;
subsequent to execution of the first memory request, executing additional requests in the first queue for the first die until the enable timer expires; and
upon expiry of the enable timer, disabling the first die and enable another one of the multiple die.
18. The non-transitory machine-readable medium of claim 15 , wherein the operations further comprise disabling the second die by de-energizing the second die.
19. The non-transitory machine-readable medium of claim 15 , wherein the operations further comprise:
processing the first memory request on the first die by:
splitting the first memory request into a first set of first multiple components;
splitting a second memory request for a third die into a second set of second multiple components, each component of the first and second sets having a corresponding power consumption;
selecting a first component of the first set and a second component of the second set such that a sum of the corresponding power consumption of the first and second components is below a power budget; and
executing the first component and the second component in parallel.
20. The non-transitory machine-readable medium of claim 19 , wherein the first memory request is a read operation and the first set of first multiple components comprises a sense component and a read transfer component.