| 摘要 |
PURPOSE:To rewrite the program of a programmable logic array by controlling information for connecting an addition transistor or not by information written in a static cell. CONSTITUTION:For instance, when a word line is externally selected in a RAM cell for storing '1', '0' information, transmission gates TR0, TR1 are turned on and prescribed information is written in inverter latches R0, R1 in the AND plane element of a PLA through a bit line BL, the inverse of BL. When the potential of the A point of the input side of the latches R0, R1 is '1', the output of the A point of an output side is defined to be '0' and accordingly, the connection of the addition transistor ANO and a product term line is separated. When the potential of the 3 point is '0..., they are connected. Accordingly, the prescribed information can be written to the PLA element. |
