| 摘要 |
<p>Apparatus for programming an OR gate, and AND gate or an EXCLUSIVE-OR gate to accept or not accept an input signal at an input terminal of the gate. The apparatus includes two pass transistors (17, 19 or 37, 39), a source of high voltage (45) or low voltage (25) depending on the gate to be programmed, and a source (21 or 41) control signal that is used for programming the gates of the pass transistors. The two pass transistors may be of the same channel type i.e., both n-channel or both p-channel, or they may be of opposite channel types. This apparatus provides positive input signals from a group of input signals to avoid voltage signal ambiguities in programming the gates. Use of these programmable gates in combination in an AND-OR array is illustrated.</p> |
