Clock transferring apparatus for synchronizing input data with internal clock and test apparatus having the same

Abstract

There is provided a clock transferring apparatus that outputs input data given in synchronization with a transmission clock in synchronization with an internal clock having a phase different from that of the transmission clock. The clock transferring apparatus includes: a comparison clock generating section that generates a comparison clock of which each clock rising edge or each clock falling edge coincides with substantially middle position on an open part of eye of the corresponding input data based on the transmission clock; an initializing section that controls a phase of the internal clock so that the phase of the internal clock is the substantially same as a phase of the comparison clock; and a data outputting section that receives the internal clock of which the phase is controlled by the initializing section and the input data, synchronizes the input data with the internal clock, and outputs the synchronized data as output data.