| 摘要 |
PROBLEM TO BE SOLVED: To provide a data transfer unit for transferring continuous data efficiently with smaller memory capacity in a USB parallel interface circuit. SOLUTION: At the end point of a conversion circuit of USB and parallel interface, a plurality of address memory sections are set. Furthermore, addresses determining the memory arrangement of two end point configuration faces constituting an end point included in a dual port RAM is set such that they are altered by the conversion circuit at the time of data transfer and stored in the plurality of address memory sections, respectively, every time when they are altered. Memory capacity at the end point is set between one to two times the size of the end point configuration face.
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