| 摘要 |
PURPOSE:To arrange an optional column regularly without disturbing a regularity of a layout of a comparison circuit of the optional column by connecting a subordinate carry output to a carry input from a self column and the carry output to a carry input of a host column. CONSTITUTION:When a comparing numbers A, B are 1, 0, namely, A>B, an output of an inverter 102 to which one of the comparing number B is inputted is 1, an output of an NAND 100 is 0, an output of an inverter 101 is 1, an output of an NOR 103 is 0, and an output of an NOR 104 is 0, which are logic levels. Accordingly, transfer gates 106, 107 are turned OFF and a transfer gate 105 is turned ON to output 1 to a host carry terminal CO. When the comparing numbers A, B are 0, 1, namely A<B, the CO gates to 0. When the comparing numbers A, B coincide, the carry output terminal CO takes the same value as CI. |
