| 摘要 |
PURPOSE:To realize an operation for executing a function output corresponding to the result of addition at a high speed by inputting the result of shifting an output of a decoder by a specific portion by a specific barrel shifter to a memory array part. CONSTITUTION:A decoder 21 decodes first input data 24. In accordance with 00, 01, 10 and 11 being input data binary number expressions of 2 bits, '1' is outputted to four pieces of first - fourth outputs of the decoder, and '0' is outputted to others. These outputs are inputted to a barrel shifter 22, and only a value of second input data 25 is shifted downward. That is, in accordance with 00, 01, 10 and 11 being binary number expressions of second input data of 2 bits, 0-3 bits are shifted downward. In 7 bits of output data of the barrel shifter 22, input data of 4 bits of the barrel shifter is shifted and data of 3 bits outputs '0'. In such a state, '1' is outputted to a position in which values of first and second input data are added, and its result is inputted to a memory array and a function value is read out. |
