| 摘要 |
PROBLEM TO BE SOLVED: To reduce a required area by sharing an address decoder and the like at each port in a multi-port structured semiconductor storage device which is used for video processing, for example. SOLUTION: A memory cell array is divided into two memory blocks 106 and 108, for example. A selection means A is provided to select and output any one of address signals of each port and control signals 101 and 102. The selection means A assigns the address signals of each port and the control signals 101 and 102 to each memory block for decoders 104 and 105 of the memory blocks 106 and 108 so that an access object of each port does not become a same memory block. For example, address signals of a port 1 for the memory block 106 and address signals of a port 2 for the memory block 108 are simultaneously assigned, respectively. Thus, two memory blocks 106 and 108 are provided with one decoder 104 and one decoder 105, respectively. COPYRIGHT: (C)2005,JPO&NCIPI
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