Abstract: Video data recording using a plurality of video camera devices can be performed more conveniently than in the conventional technique. A video camera device working as a parent device has a signal sending/receiving function and a control function for the whole system, and a video camera device working as a child device has a signal sending/receiving function. The parent device sends synchronization data for time synchronization, and each child device performs a shooting operation in time synchronization with the parent device in accordance with the received synchronization data.

Abstract: Pin setting data for defining initial states of external pins of a programmable logic device (PLD) is transferred to the PLD to set all the external pins before logic setting data for the PLD is transferred from memory, thereby preventing an unstable state of the PLD from propagating to logic circuits adjacent to the PLD. The logic setting data is divided into minimum logic setting data for defining functions required for a stable operation of a system and full logic setting data for defining all functions of the PLD, including functions other than the functions required for a stable operation of the system, and the former is transferred before the latter to reduce a period in which the PLD is unstable during the startup of the system, thereby avoiding instability during the system startup when the PLD is incorporated into an existing system.

Abstract: Video data recording using a plurality of video camera devices can be performed more conveniently than in the conventional technique. A video camera device working as a parent device has a signal sending/receiving function and a control function for the whole system, and a video camera device working as a child device has a signal sending/receiving function. The parent device sends synchronization data for time synchronization, and each child device performs a shooting operation in time synchronization with the parent device in accordance with the received synchronization data.