SEMICONDUCTOR MEMORY DEVICE OUTPUTTING READ-BUSY SIGNAL AND MEMORY SYSTEM INCLUDING THE SAME

摘要

A semiconductor memory device includes a plurality of memory cells; a peripheral circuit suitable for controlling the memory cells, and operating in first and second modes respectively corresponding to enablement and disablement of a chip selection signal; and a ready-busy signal generator suitable for biasing a ready-busy line according to whether the peripheral circuit is in a ready or busy state during the enablement of the chip selection signal. Communication between the semiconductor memory device and an external device is allowed in the first mode. The communication between the semiconductor memory device and the external device is not allowed in the second mode.