| 摘要 |
A delay circuit includes: a delay unit configured to delay an input signal and output the delayed signal; a selecting unit configured to select a first signal at the time of a normal operation or a second signal at the time of a test operation, and provide the selected signal to the delay unit; an inverting unit configured to invert an output signal of the delay unit, and output the inverted signal as the second signal; and a counting unit configured to count an output waveform of the delay unit.
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