A PSRAM features a mode register set (MRS) for setting a mode register at a combined synchronous and asynchronous mode. The PSRAM having a combined synchronous and asynchronous mode register set includes a MRS, a mode register control unit, a plurality of control signal buffers, an address buffer, a clock buffer, and a synchronous and asynchronous detecting unit. Here, the plurality of control signal buffers, the address buffer and the clock buffers are controlled by a chip selecting signal at an asynchronous mode, and are operated synchronously with respect to an internal clock outputted from the clock buffer regardless of the chip selecting signal at a synchronous mode.

 
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