| 摘要 |
PURPOSE:To simplify and miniaturize a multiplexer by multiplying plural multiplication coefficients whose minimum weight are displayed decided in advance by input data by controlling a selector, an inverter, and the carry input of an adder. CONSTITUTION:The selector 200 selects the left shift data of multiplication input corresponding to a term coefficient which becomes the most significant non-zero of the multiplication coefficient, and the selectors 201 and 202 select the left shift data of respective multiplication input corresponding to the term coefficients which become the non-zeros of residual multiplication coefficients by a selection signal SEL, respectively. The inverters 203 and 204 execute the bit inversion of data when the complement control signals IVT(1) and IVT(2) of 2 go to 1s when the term coefficients of the multiplication coefficients to which the selectors 201 and 202 correspond are set at -1. The arithmetic operation of the complement of 2 is performed by inputting 1 to the carry input(CI) of the adders 205 and 206. The adders 205 and 206 execute the multiplication of multiplication input data X by the absolute value of the multiplication coefficient after adding the output data of the selector 200 on that of the inverters 203 and 204. |
