Apparatus for transmitting and receiving a signal, a method of operating the same, a memory device, and a method of operating the memory device

A method of operating a memory controller, which transmits or receives a data signal through a data pin of a memory device being connected to a first on-die termination circuit and, when enabled, the first on-die termination circuit provides a first termination resistance to a signal line connected to the data pin, and receives a read data strobe signal through a read data strobe pin of the memory device being connected to a second on-die termination circuit and, when enabled, the second on-die termination circuit provides a second termination resistance to a signal line connected to the read data strobe pin, the method comprising:

• obtaining an indicator signal by reading a mode register of a memory device;
• transmitting a data read command to the memory device;
• controlling the first on-die termination circuit and the second on-die termination circuit independently or simultaneously based on the indicator signal;
• receiving the read data strobe signal from the memory device through the read data strobe pin;
• and
• receiving the read data from the memory device through the data pin, and
• wherein in a read-to-write operation, a time delay between a read operation and a write operation is different when controlling the first on-die termination circuit and the second on-die termination circuit independently, and when controlling the first on-die termination circuit and the second on-die termination circuit simultaneously.

A memory controller configured to control a memory device comprising a first on-die termination circuit connected to a data pin for transmitting or receiving a data signal and, when enabled, the first on-die termination circuit is configured to provide a first termination resistance to a signal line connected to the data pin, a second on-die termination circuit connected to a read data strobe pin for transmitting or a read data strobe signal and, when enabled, the second on-die termination circuit is configured to provide a second termination resistance to a signal line connected to the read data strobe pin, and a mode register configured to store an indicator signal,

• wherein the memory controller is configured to
• obtain the indicator signal by reading the mode register,
• transmit a data read command to the memory device,
• control the first on-die termination circuit and the second on-die termination circuit independently or simultaneously based on the indicator signal,
• receive the read data strobe signal through the read data strobe pin, and
• receive the read data through the data pin,
• when the indicator signal indicates the first on-die termination circuit and the second on-die termination circuit are independently controlled,
• wherein the memory controller is further configured to
• enable the first on-die termination circuit after a third time period elapses from when the data read command is received, and
• enable the second on-die termination circuit after a fourth time period elapses from when the data read command is received, and
• wherein the fourth time period is greater than the third time period.