| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To duplex clock supply without providing a daughtercard for clock supply. <P>SOLUTION: On daughtercards 11 to 14, clock distribution circuits 21 to 24 are provided, respectively. In slots #1 to #4 of a motherboard 19, the daughtercards are mounted, respectively, connecting the slots to a clock bus 10. Each of the daughtercards receives a slot number (i) of the slot in which it is mounted, and, if a clock is not detected on the clock bus after power-on or even when i×t1 is elapsed from the time point when the clock on the clock bus is shut down during operation, outputs a clock signal to the clock bus. <P>COPYRIGHT: (C)2003,JPO</p> |
