| 摘要 |
PROBLEM TO BE SOLVED: To provide a programmable function block which has both multifunctional and fast properties by adding an AND-OR circuit functioning as a versatile logic circuit to an full adder to construct the programmable function block. SOLUTION: A programmable function block 7 consists of a logic block 5 and an input block 6. The block 5 includes a full adder 1 and a pre-logic 2, and the block 6 includes plural input selection unit 6.i (i=1, 2, 3...) respectively. The input lines of the block 5 are connected to a mutually coupled wiring 8 via the unit 6.i. The logic 2 consists of a 5-input/1-output AND-OR circuit which has a partly inverted input and functions as a versatile logic circuit when a specific input is set at 0 (low level) or 1 (high level). |
