| 摘要 |
PROBLEM TO BE SOLVED: To achieve a data communication device in which deterioration of signal quality is reduced, even when the propagation time of data signal and the data cycle length of data signal approximate a bitter spot.SOLUTION: A data communication device has a first device 10 and a second device 30, the data communication communicates data every continuous data cycle, the total time length of continuous N (N:integer of 2 or more) data cycles is constant, and the time length of each data cycle is variable. The first device has training circuits 21-25 for generating a training pattern data having a changed time length and transmitting to the second device, repeating the training for determining good/bad of the changed time length, while changing the time length, based on the comparison result of the reply data received from the second device and the training pattern data, and setting the time length of each data cycle in a good determination range.SELECTED DRAWING: Figure 3 |
