Memory device, storage device, and computing system including memory device and storage device
A memory device is provided. The memory device includes: a buffer memory; a nonvolatile backup memory; and a memory controller configured to: store map data corresponding to an external storage device in the buffer memory; provide, in response to a request from the external storage device, an address pair corresponding to the request, from among address pairs of the map data, to the external storage device; and back up, in response to a sudden power-off event, the map data to the nonvolatile backup memory.
1. A memory device comprising:
a buffer memory;
a nonvolatile backup memory; and
a memory controller configured to:
store map data corresponding to an external storage device in the buffer memory;
provide, in response to a request from the external storage device, an address pair corresponding to the request, from among address pairs of the map data, to the external storage device; and
back up, in response to a sudden power-off event, the map data to the nonvolatile backup memory.
2. The memory device of claim 1 , wherein the memory controller is configured to, in response to the sudden power-off event, record a device identifier of the external storage device corresponding to the map data and addresses of the buffer memory, at which the map data are stored.
3. The memory device of claim 2 , wherein the memory controller is configured to, based on power being turned on after the sudden power-off event, provide an external host with the device identifier and the addresses in response to a request from the external host.
4. The memory device of claim 2 , wherein the memory controller is configured to, based on power being turned on after the sudden power-off event:
read the map data stored in the nonvolatile backup memory; and
store the map data read from the nonvolatile backup memory in a storage space of the buffer memory corresponding to the addresses.
5. The memory device of claim 4 , wherein the memory controller is configured to, based on the power being turned on after the sudden power-off event, in response to the request from the external storage device:
read the map data stored in the buffer memory; and
send the map data read from the buffer memory to the external storage device.
6. The memory device of claim 2 , wherein the memory controller is connected with a detachable power storage, and
wherein the memory controller is configured to, in response to the sudden power-off event being detected, back up the map data in the nonvolatile backup memory by using the detachable power storage.
7. The memory device of claim 1 , wherein the memory controller is configured to, in response to a typical power-off:
read the map data from the buffer memory; and
send the map data read from the buffer memory to the external storage device.
8. The memory device of claim 7 , wherein the memory controller is configured to, in response to the typical power-off and the request from the external storage device, provide the map data read from the buffer memory to the external storage device and to then perform power-off with the map data present in the buffer memory.
9. The memory device of claim 8 , wherein the memory controller is configured to, based on power being turned on after the typical power-off, store the map data from the external storage device in the buffer memory.
10. A storage device comprising:
a nonvolatile memory configured to store user data and map data; and
a storage controller configured to:
read the map data from the nonvolatile memory;
send the map data read from the nonvolatile memory to an external memory device;
request an address pair, for access to the nonvolatile memory, from among address pairs of the map data to the external memory device from the external memory device; and
based on power being turned on after a sudden power-off, request the map data from the external memory device.
11. The storage device of claim 10 , wherein the storage controller is configured to, based on the power being turned on after the sudden power-off, update the map data stored in the nonvolatile memory by using the map data from the external memory device.