Semiconductor device and method

A semiconductor device comprising:

• a terminal group configured to receive a first signal and a second signal from a host;
• a first chip electrically connected the terminal group;
• and
• a second chip electrically connected to the first chip, wherein
• the first chip is configured to, in response to reception of the first signal, transmit a third signal corresponding to the first signal to the second chip, and
• is configured to, when the first chip has received the second signal before the first signal, refrain from transmitting the third signal to the second chip,
• the first chip includes a first memory and a fourth memory,
• the second chip includes a second memory and a third memory,
• the first signal includes a second command for writing first information into the first memory or the second memory,
• the first chip is configured to store the first information into the first memory, in response to reception of the second signal before the second command,
• the first information includes second information representing a set value of a size of data to be input or output to or from the third memory,
• the first signal includes a third command for causing the second chip to output data from the third memory, and
• the first chip is configured to:
• transmit a fourth command corresponding to the first signal to the second chip, in response to reception of the first signal after receiving the third command from the host;
• sequentially buffer first data in the fourth memory, the first data being data output from the second chip in accordance with the fourth command;
• and
• notify the host of third information representing that a size of the first data buffered in the fourth memory has reached a threshold, the threshold being defined based on the second information.