| 摘要 |
The present invention relates to a semiconductor device and, more specifically, to an apparatus to generate a transmission clock in a downstream device of a bidirectional interface. An embodiment according to an aspect of the present invention provides the apparatus to generate a transmission clock in a downstream device. The apparatus to generate a transmission clock in a downstream device includes: a digital phase detector disposed in a receiver to detect a phase difference between a received clock and a restored clock; a time-digital converter disposed in the receiver to generate a digital control oscillator code using the phase difference detected by the digital phase detector; a first digital control oscillator disposed in the receiver to output the restored clock using the digital control oscillator code; a second digital control oscillator disposed in a transmitter to output the transmission clock using the digital control oscillator code; a lock detector which compares the received clock with the restored clock to output a locking detection signal indicating whether the first digital control oscillator is locked; and a transmission clock setter to provide the digital control oscillator code to the second digital control oscillator when the locking detection signal is outputted. |
