| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce the number of connections of UTOPIA buses for connecting an ATM layer device to a PHY layer device. SOLUTION: Each control signal of a UTOPIA bus 2, for connecting an ATM layer device 1 to a PHY layer device 3, is shared by reception side processing and transmission side processing, and the transmission side processing and the reception side processing are switched alternately through time-division. In this case, the switching timing of PHY output enable to disable and the switching timing of ATM output disable to enable are executed respectively, at the rising and falling of a clock with a fixed time interval, far avoiding collision of the mutual output signals at switching.</p> |
