| 摘要 |
PURPOSE:To remove the reflection of a signal due to non-connection by transmitting the connection state signal of a clock receiving unit to a clock generating part, and blocking the transmission of a clock to a non-connected slot by ON/ OFF-controlling the transmission of the clock to a clock transmitting part. CONSTITUTION:The clock receiving units 4-1 to 4-n are provided with plural slots 3-1 to 3-n to be connected, and a reference clock is transmitted to the clock receiving units from the clock generating distributing part through clock transmission lines 21-1 to 21-n. Each slot 3-1 to 3-n transmits the connection state signal showing the presence of the package of the clock receiving unit in its own slot to the clock generating part 1. The clock generating part 1 ON/OFF-controls the transmission of the clock to the clock transmission line on the basis of the connection state signal, and blocks the transmission of the clock to the non-connected slot 3-2. Thus, the reflection of the signal can be removed at the time when the high-speed clock signal is distributed to plural printed board units in a device. |
