To reduce error of a timing from signal reception to signal transmission.
In a data processing system where a plurality of data processing nodes are connected to a communication channel in a given topology, the data processing apparatus at a data processing node has a communication function of reproducing a received clock signal based on a received signal, reproducing the received data from the received signal in a received data reproduction unit (122) in synchronism with the received clock signal thus reproduced, generating the transmission data for the received data thus reproduced in a transmission data generation unit (123), and generating a transmission signal from the transmission data in a transmission unit (125) and then transmitting the transmission signal to the communication channel in synchronism with a transmission clock signal. Furthermore, the data processing node has a detection unit (124) which detects the error time when the processing time is short for the permitted time until the transmission signal is transmitted from the transmission unit after a signal is received at the received data reproduction unit. The transmission unit starts transmission of the transmission data after an elapse of the error time detected in the detection unit.
YAMAZAKI HIDEKI
OBINATA NOBUAKI
NAKAMOTO YOICHI
KANEKO GOSUKE
MOCHIZUKI YOSHINORI
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