| 摘要 |
PROBLEM TO BE SOLVED: To inform a package that controls clock changeover of interruption detection information of a clock having redundant constitution in a short time and to decrease the number of connector terminals used to collect the information. SOLUTION: Plural packages 1-1 to 1-n detect clock interruption information and uses a tri-state line driver to output the clock interruption information and on a back board 2, wired-ORing is taken to input the clock interruption information to a control package 4 that collects the clock interruption information. The package has a system selection control function and sends a clock changeover signal in the lump to each of the packages to switch a system clock. |
