| 摘要 |
PROBLEM TO BE SOLVED: To simply and flexibly specify an address in the case of double word access by efficiently using a memory area of a shared memory when the double word access for the shared memory is performed. SOLUTION: In this separation prevention circuit 20, control to make access to the shared memory 4 by unit of word in an ascending order or a descending order shown by ascending order/descending order setting registers 12a, 12b when setting of the double word access exists in double word access setting registers 11a, 11b, to continuously read a double word from the shared memory 4 by unit of word, to store it in buffers 14a, 14b when the double word is read from the shared memory 4, to store the double word in the buffers 14a, 14b when the double word is written in the shared memory 4 and to continuously write the double word stored in the buffers in the shared memory 4 when access to the remaining word of the double word is requested after that is performed.
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