RECONSTITUTABLE COPROCESSOR FOR DATA PROCESSING SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a data processing coprocessor by containing the plural pairs of multipliers, a plurality of first adders receiving respective product outputs from the plural pairs of multipliers and a second adder receiving sum outputs from a pair of corresponding first adders. SOLUTION: The plural pairs of multipliers, a plurality of first adders receiving respective product outputs from the plural pairs of multipliers and a second adder receiving sum outputs from a pair of corresponding first adders are contained. Code extension circuits are contained in respective multiplier outputs in a coprocessor 140. One mtultiplier in each pair has a fixed length left shift circuit shifting product output to a left direction by the previously decided number of bits. The other multiplier in each pair contains a right shift circuit shifting product output to a right direction by the same number of bits. The reconstitution possible hardware coprocessor 140 is connected to an integrated circuit and the other parts through a data bus 101 and an address bus 103.