Patent ID: 9569128
Date: 2017-02-14
CPC Classifications: G06F,G11C,Y02D

Claim:
1. A storage device comprising: a nonvolatile memory; a volatile memory; a power supply control circuit configured to control power supply to the nonvolatile memory and the volatile memory; and a control circuit configured to control the power supply circuit to cut off the power supply to the nonvolatile memory and the volatile memory during a first operation that is carried out when a condition is satisfied, and control the power supply circuit to cut off the power supply to the nonvolatile memory and to maintain the power supply to the volatile memory during a second operation that is carried out when the condition is not satisfied, wherein the condition includes at least one of: i) a time period from a time when a last sleep state ended to a present time is equal to or smaller than a first threshold value, ii) a number of times the first operation has been carried out is equal to or smaller than a second threshold value, and iii) a number of times the first operation has been carried out in a predetermined time period is equal to or smaller than a third threshold value.