Patent ID: 6385635
Filing Date: 2002-05-07
Classification: G06F

Abstract:
A product sum operation device comprising:data transfer means for transferring four data simultaneously; first through fourth multipliers each adapted to receive two data that are assigned in advance out of the four data transferred from said data transfer means to carry out a multiplication operation with said two data received; switching means connected between said data transfer means and a specific one of said first through said fourth multipliers, said switch means being supplied with a control signal, said switch means being adapted to receive one of the data assigned to the specific one of said multipliers and supplying it immediately to the specific one of said multipliers when said control signal indicates a first state, said switch means supplying previous data to the specific one of said multipliers on reception of next data from said data transfer means when the control signal indicates a second state; a first adder-subtracter for carrying out adding and subtracting operations with the multiplication results obtained by said first and second multipliers; a second adder-subtracter for carrying out adding and subtracting operations with the multiplication results obtained by said third and said fourth multipliers; first and second accumulators; a first adder for adding the addition result obtained by said first adder-subtracter to a value previously stored in said first accumulator to give the addition result to said first accumulator as a new value; and a second adder for adding the addition result obtained by said second adder-subtracter to a value previously stored in said second accumulator to give the addition result to said second accumulator as a new value.