| 摘要 |
A read data counter counts an unread data amount which is a data amount not yet transferred by adding, whenever a read command is issued, a read data amount which should be acquired by the read command and counting down whenever data is read. A read command issue control unit determines whether or not a determination amount of read command reject which is obtained by subtracting the unread data amount from the free space of the internal memory is equal to or more than a read data amount of the following acquisition target, and allows the issue of the read command when the determination result is affirmative.
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