| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a data transmission circuit which can reduce a skew between data as much as possible. <P>SOLUTION: A mode setting unit 46 with which a multifunction device 1 is set to a calibration mode in which a process for setting a drive ability of each of differential driver units 205 to 207 is performed, for instance, when a main power source of the multifunction device 1 is turned on or at a certain timing in a period in which an image forming operation is not performed, a drive ability setting unit 48 which changes a step of the drive ability of the differential driver units 205 to 207 in order, and a detection unit 47 which instructs a transmission control circuit 200 so that a predetermined signal for correction is outputted from parallel-serial conversion units 201 to 203 in each step of the drive ability and detects a timing at which the signal for correction is received by serial to parallel conversion units 307 to 309 by using a reception control circuit 300 are included. <P>COPYRIGHT: (C)2010,JPO&INPIT |
