| 摘要 |
<p>A plurality of conduction control circuits controls conduction of input signals. A logical operation circuit (22) receives output signals from each of the conduction control circuits via a plurality of signal paths (24a,24b), and performs a logical operation on each of the output signals to output a single signal (X). A signal-level setting circuit (23a,23b) sets, when the conduction of the input signals in the conduction control circuits connected to a same signal path is blocked, a signal level of the signal path. A control-signal generating circuit generates a first control signal (SELA to SELD, XSELA to XSELD) that controls the conduction control circuits to select only one input signal for conduction, and a second control signal (NSL1,NSL2) that controls the signal-level setting circuit (23a,23b) to set the signal level of the signal path, by performing a logical operation on a same input signal.</p> |
