| 摘要 |
<p>PURPOSE:To autonomously select one from among packages by multiplex- connecting the clock outputs of plural clock supply packages, and providing a clock output selection control circuit. CONSTITUTION:All the clock supply packages 11-16 are not always packaged. It is assumed that only the clock supply package 12 is packaged, and the package 14 is newly packaged, for example. Since the control signal of an output gate 104 comes to earth by the package 12 at that time, the output is prohibited, and a reception package 10 operates by the clock from the package 12. When plural clock supply packages 11-16 are packaged in the same way, other outputs are prohibited excluding one output. Thus, one package can autonomously be selected from the clock supply circuit on which the packages are arbitrarily packaged.</p> |
