PRECEDING ZERO TWO-LEVELS AND MULTILEVEL UNIT DETECTING THE NUMBER OF PRECEDING ZERO OF MANTISSA PART OF THE NUMBER OF FLOATING DECIMAL POINTS, UNIT FOR LEFT SHIFT NORMALIZATION OF MANTISSA OF FLOATING DECIMAL POINT AND METHOD FOR DETECTING THE NUMBER OF PRECEDING ZERO

摘要

PURPOSE: To provide a multilevel preceding zero detector used for the left shift normalization of a floating decimal point mantissa. ;CONSTITUTION: The detection of precedence 1 can be executed by segmenting the mantissa to non-overlapped segment. The highest-order segment including a non-zero value bit is detected to start an output line corresponding to a segment position within the mantissa. A designated highest-order segment is selected by detection at a second level and the position of the highest non-zero bit within the segment is detected to start a line within the lines of a second set respectively corresponding to the bit position within the segment. This preceding zero detector forms a perfect shift normalization unit by combining with a multilevel left shift unit.;COPYRIGHT: (C)1994,JPO