Storage device and communication control method

1. A storage device comprising:

a nonvolatile memory; and

a controller configured to control a first communication with a host device, and a second communication with the nonvolatile memory, wherein the controller includes:

a detection circuit configured to detect a transfer rate in the second communication with the nonvolatile memory;

an interface circuit that is configurable to operate in one of a plurality of different operating modes to perform the first communication with the host device at a transfer rate corresponding to said one of the operating modes of the interface circuit; and

a processor configured to determine an operating mode of the interface circuit based on the transfer rate in the second communication, and set the interface circuit to operate in the determined operating mode.

2. The storage device according to claim 1 , wherein the detection circuit is configured to detect the transfer rate in the second communication based on the number of channels of the controller connected to the nonvolatile memory and a frequency used in the second communication.

3. The storage device according to claim 1 , wherein the detection circuit is configured to detect the transfer rate in the second communication based on a power throttling set value set to limit power consumption of the storage device.

4. The storage device according to claim 1 , wherein the detection circuit is configured to detect the transfer rate in the second communication based on a temperature throttling set value set to limit a temperature of the storage device.

5. The storage device according to claim 1 , wherein the detection circuit is configured to detect the second transfer rate in the second communication based on the bandwidth consumption amount of a background job executed by the controller for the nonvolatile memory.

6. The storage device according to claim 1 , wherein the detection circuit is configured to obtain the transfer rate in the second communication based on the bandwidth consumption rate of a background job executed by the controller for the nonvolatile memory.

7. The storage device according to claim 1 , wherein the interface circuit is configured with multiple link widths and multiple generations, and the processor sets the interface circuit to operate in the determined operating mode by changing a link width of the interface circuit and a generation of the interface circuit.

8. A storage device comprising:

a nonvolatile memory; and

a controller configured to control a first communication with a host device, and a second communication with the nonvolatile memory,

wherein the controller includes:

a detection circuit configured to detect a first transfer rate in the first communication with the host device;

an interface circuit that is configurable to operate in one of a plurality of different operating modes to perform the first communication with the host device at a transfer rate corresponding to said one of the operating modes of the interface circuit; and

a processor configured to determine an operating mode of the interface circuit based on the transfer rate in the first communication, and set the interface circuit to operate in the determined operating mode.

9. The storage device according to claim 8 , wherein the interface circuit is configured with multiple link widths and multiple generations, and the processor sets the interface circuit to operate in the determined operating mode by changing a link width of the interface circuit and a generation of the interface circuit.

10. The storage device according to claim 8 , wherein

the detection circuit detects the transfer rate in the first communication based on a performance throttling set value that is set to limit the performance of the storage device.

11. A communication control method comprising:

performing a first communication between a host device and a storage device including a nonvolatile memory and a controller that controls the nonvolatile memory;

detecting a transfer rate in a second communication between the controller and the nonvolatile memory;

determining an operating mode of an interface circuit of the controller based on the transfer rate in the second communication; and

configuring the interface circuit to operate in the determined operating mode to perform the first communication at a transfer rate corresponding to the determined operating mode.

12. The method according to claim 11 , further comprising:

detecting the transfer rate in the second communication and adjusting the transfer rate in the second communication based on the number of channels of the controller connected to the nonvolatile memory and a frequency used in the second communication.

13. The method according to claim 11 , further comprising:

detecting the transfer rate in the second communication and adjusting the transfer rate in the second communication based on a power throttling set value set to limit power consumption of the storage device.

14. The method according to claim 11 , further comprising:

detecting the transfer rate in the second communication and adjusting the transfer rate in the second communication based on a temperature throttling set value set to limit a temperature of the storage device.

15. The method according to claim 11 , further comprising:

detecting the transfer rate in the second communication and adjusting the transfer rate in the second communication based on the bandwidth consumption amount of a background job executed by the controller for the nonvolatile memory.

16. The method according to claim 11 , further comprising:

detecting the transfer rate in the second communication and adjusting the transfer rate in the second communication based on the bandwidth consumption rate of a background job executed by the controller for the nonvolatile memory.

17. The method according to claim 11 , wherein the interface circuit is configured by changing a link width of the interface circuit and a generation of the interface circuit.