Method and system for supporting memory functions during low power modes of a portable computing device (PCD)

A system for providing memory functions during a low power mode of a portable computing device (“PCD”), the system comprising:

• a main memory device of the PCD storing a main page table, the main memory device being operational during a first state of the PCD;
• a first low power memory device storing a low power mode page table;
• a second low power memory device storing low power mode data;
• the PCD being placed into a second state such that the first low power memory device and the second low power memory device are operational while the main memory is inoperational during the second state;
• and
• a processor during the second state processing one or more memory requests by using the low power mode page table in the first low power memory device to access the low power mode data stored in the second low power memory device.

A computer program product comprising a non-transitory computer usable medium having a computer readable program code embodied therein, said computer readable program code adapted to be executed to implement a method for providing memory functions during a low power mode of a portable computing device (“PCD”), said method comprising:

• during a first state of the PCD, creating a main page table in a main memory device of the PCD, the main memory device being operational during the first state;
• during the first state of the PCD, creating a low power mode page table in a first low power memory device;
• during the first state of the PCD, storing low power mode data in a second low power memory device;
• placing the PCD into a second state such that the first low power memory device and the second low power memory device are operational while the main memory is inoperational during the second state;
• and
• during the second state, processing one or more memory requests by using the low power mode page table in the first low power memory device to access the low power mode data stored in the second low power memory device.