| 摘要 |
PURPOSE:To vary basic logic by adopting logic circuit constitution that a variable PROM element is connected in series with two input gate elements respectively and a gate element is inserted between a connecting point of one input gate element and the variable PROM element and an input terminal of the other input gate element. CONSTITUTION:Variable PROM elements P1, P2 are connected in series with two input gate elements Tr 1, Tr 2 and a gate element Tr 3 whose gate is connected to one input terminal is inserted between the input terminal of one input gate element of the Trs 1, 2 and a connecting point of the other input gate element and the variable PROM element to constitute a logic circuit. In selecting ON/OFF of the two variable PROM elements, a NOR, a NAND or an inverter circuit is obtained. The NOR circuit is formed in selecting the ON state for both the elements P1, P2. The NAND circuit is formed by selecting both the elements P1, P2 as OFF state. In selecting the element P1 as the ON state and selecting the element P2 as the OFF state, an In1 inverter circuit is obtained. Further, in selecting the element P1 as the OFF state and the P2 as the ON state, an In2 inverter circuit is obtained. |
