Nonvolatile memory device including input/output pad, storage system comprising nonvolatile memory device, and method of operating nonvolatile memory device

A method of operating a nonvolatile memory device, the method comprising:

• receiving a status output start command;
• sequentially outputting at least one status signal corresponding to an operating status of a data read operation on each of a plurality of planes based on the status output start command;
• receiving an output command;
• sequentially outputting at least a portion of data stored in the plurality of planes based on the output command;
• receiving a status output termination command;
• and
• terminating the output of the at least one status signal based on the status output termination command.

A storage system comprising:

• a nonvolatile memory device configured to store data;
• and
• a memory controller configured to receive data from the nonvolatile memory device or provide data to the nonvolatile memory device,
• wherein:
• the memory controller is configured to generate and output a status output start command and an output command;
• the nonvolatile memory device comprises a plurality of memory chips;
• and
• each of the plurality of memory chips comprises:
• a memory cell array comprising a plurality of planes and configured to store data;
• a command-address pad configured to receive the status output start command and the output command;
• at least one status output pad configured to sequentially output status signals, respectively corresponding to operating statuses of the plurality of planes, based on the status output start command;
• and
• an input/output pad configured to sequentially output at least a portion of data stored in the plurality of planes based on the status signal and the output command.