Memory device, and information-processing device
According to one embodiment, the memory device includes a non-volatile memory, a volatile memory, and a controller. The controller carries out the transition to two different sleep states depending on a sleep instruction from the host device and saves sleep state information indicating the sleep state after the transition to the host-side storage device. Upon receiving a return instruction from the host device, the controller carries out return processing in accordance with the sleep state information stored in the host-side storage device.
1. A memory device connectable to a host device having a host-side memory, the memory device comprising:
a first non-volatile memory;
a volatile memory configured to store data written to or read from the first non-volatile memory;
a controller configured to transfer data between the first non-volatile memory and the volatile memory; and
a second non-volatile memory that stores sleep state support information indicating whether the memory device supports a sleep state, the sleep state being a state in which power supplies for the first non-volatile memory, the volatile memory, the controller, and the second non-volatile memory are shut off and information that has been stored in the volatile memory is saved in the host-side memory,
wherein the controller is configured to:
carry out transition to the sleep state depending on a sleep instruction from the host device; and
upon receiving a return instruction from the host device, refer to the sleep state support information in the second non-volatile memory and when the sleep state is not supported, carry out startup processing of the first non-volatile memory without waiting for link layer establishment processing relative to the host device.
2. The memory device according to claim 1 , wherein
the second non-volatile memory holds link layer establishment information used for the link layer establishment processing, and
the controller reads, during the return processing, the link layer establishment information from the second non-volatile memory and carries out the link layer establishment processing.
3. The memory device according to claim 1 , wherein
the second non-volatile memory holds access speed support information indicating whether a high speed mode is supported, and
the controller reads, during the return processing, the access speed support information from the second non-volatile memory and when the high speed mode is supported, carries out processing in the high speed mode.
4. The memory device according to claim 3 ,
wherein the second non-volatile memory is a memory having a fast access speed and a small memory capacity compared to the first non-volatile memory.