| 摘要 |
PURPOSE:To economically use a memory resource by executing a write operation by means of a first clock and a read operation by means of a second clock while plural memories are sequentially switched. CONSTITUTION:Data are sequentially written in m-number of storage areas M1-Mm in accordance with the first clock CK1, and data are sequentially read in accordance with the second clock CK2 with a frequency lower than that of the first clock CK1. Consequently, the time base of data can be extended compared to the ratio of two clocks. Here, a series of data string is divided into n-number of unit data and the writing/reading into storage areas M1-Mn are executed for respective divided data. Other divided data are read from the other storage areas in parallel while arbitrary divided data is written in the arbitrary storage area. Thus, a total storage capacity does not exceed a series of data capacity even if it is maximum and a memory capacity can be reduced. |
