| 摘要 |
PROBLEM TO BE SOLVED: To easily discriminate a portion causing data transfer error by permitting a user to view a paper sheet after printing when a data transfer destination circuit cannot read proper data written into a line buffer by a data transfer source circuit. SOLUTION: A writing control circuit 5 writes data showing a previously decided color in an address where reading is terminated before a writing-side circuit 2 writes new data being a transfer object in the address where reading is terminated after the writing-side circuit 2 reads data written in a dual port memory 3 at each address. When the writing of data on the transfer object by the writing-side circuit 2 is delayed, and the reading of data by a reading-side circuit 4 is performed earlier than data writing by the writing-side circuit 2, the reading-side circuit 4 reads data showing the predetermined color. COPYRIGHT: (C)2006,JPO&NCIPI
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