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The simulation shown on the above figure illustratesthe signal distortion produced by line reflection at the end of the line which is not well terminated. Even if thesignal at the start of the line has the correctform (upper curve), considerable distortion arises at the end of the line (lower curve). On the positive edge, the overshootcan exceed the maximum operating voltage of the used circuit technologywhich will then be destroyed.Also, the following negativeundershoot may reach a levellow enough to change the value of thelogic state. If it affects of an addressline, a wrong memory cell will be addressed,and in the case of a data line, the data can be corrupted. This phenomena also occurs on the falling edge.