| 摘要 |
PURPOSE:To improve the using efficiency of the arithmetic device by dividing many full adders constituting a parallel adder into plural groups and connecting a carry propagation control means for allowing or inhibiting carry propagation from one group to the other group between both the groups. CONSTITUTION:Many full adders constituting the parallel adder are divided into plural groups and the carry propagation control means for allowing or inhibiting carry propagation from one group to the other group is connected between both the groups. Namely, carry propagation from one group of full adders to the other group of full adders is inhibited or permitted by the carry propagation control means. Since both the groups of full adders can be indepen dently or connectedly driven, the using efficiency of the parallel adder can be improved. |
