PURPOSE:To attain OR logic of optional time slots by using plural storage circuits so as to repeat the write of OR logic of an input data, storage of written content and initial setting in parallel sequentially corresponding to a line number. CONSTITUTION:A line number (b) is read corresponding to a channel number (a) is read from an address control storage circuit 5 storing a line number corresponding to a channel number. When the level of a control signal (c) is at an H, write signals f, g are fed to data storage circuits 6, 7, and a selector 9 outputs selectively a read output signal of a storage circuit 6 and a selector 10 outputs selectively a read output signal of a data storage circuit 8 by using a selection signal (s). Since the level of control signals d, e is at an L level, all 0 is written in the storage circuit 7 to apply initial setting. Thus, in reading the data from storage circuits 6-8 storing the data, the OR logic of channels of the same line number is taken.
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