N-DIGIT SUBTRACTION UNIT, N-DIGIT SUBTRACTION MODULE, N-DIGIT ADDITION UNIT AND N-DIGIT ADDITION MODULE

摘要

PROBLEM TO BE SOLVED: To provide an N-digit addition and subtraction unit and an N-digit addition and subtraction module in which borrowing and carrying are not propagated in modules having basic digits.;SOLUTION: In the N-digit addition and subtraction unit and the N-digit addition and subtraction module using it, an output pattern of results of addition and subtraction is predicted based on a relation between an augend and an addend on the basis of regurality of addition and subtraction of an adder-subtracter, particularly, thereby preventing borrowing and carrying from being propagated in modules having basic digits.;COPYRIGHT: (C)2010,JPO&INPIT