DATA BUS HAVING INDIVIDUALLY ALIGNED LINE IMPEDANCE AND METHOD FOR ALIGNING LINE IMPEDANCE

摘要

PROBLEM TO BE SOLVED: To provide a means for more effectively aligning impedance of each line a bus on a printed circuit board. SOLUTION: A data bus (20) for the printed circuit board having a plurality of lines (1 to 11) separated by a substrate (90) is disclosed. The lines (1 to 11) of the bus (20) include data lines (3 to 11) and at least two strobe lines (1, 2). The strobe lines (1, 2) are mutually adjacently arranged for the purpose of using known impedance unique to remarkable coupling of them. The bus (20) is provided with separate data line termination (41) and a strobe line termination (42) connected with the data lines (3 to 11) and the strobe lines (1, 2) respectively. The separate terminations (41 to 42) have values to be aligned to the impedance calculated from a set of separate lines (1 to 11) for the purpose of more effectively reducing energy to be reflected by exactly aligning the impedance by the lines (1 to 11). COPYRIGHT: (C)2004,JPO