A semiconductor memory is provided. The semiconductor memory comprises: a memory core having a memory unit; a timer measuring the receiver to the external measurement signal the beginning of the scheduled time, and after the scheduled time after the above requests output signal, referred to the external access signal used to described the implementation of core memory read operation, described the visit request signal used to operate above the kernel memory; prohibit the terminal, the receiver timer for measuring the prohibition referred to in the prohibition referred to in the scheduled timesignal; and the beginning of the signal output circuit, the prohibition referred to in the provision of its signals in response to referred to an external signal receiver and the mandatory visit to visit the request referred to in the output signal, which referred to the scheduled time longer than the core operation, the kernel memory operation is described in a single-core implementation of the time it takes to operate.