| 摘要 |
PURPOSE:To reduce the circuit scale of a multiplier and a syndrome computing element. CONSTITUTION:Outputs of partial product registers 71 to 78 are given to a coefficient device 81 and adders 82 to 88. Switches 92, 93, 94, and 96 give the outputs of coefficient devices 81 to 108 to adders 82 to 88 at the time of multiplying operation. Then, the multiplication result is obtained from the adder 88. Switches 92, 93, 94, and 96 give the outputs of registers 112, 113, 115, and 118 at the time of syndrome operation. Contents of partial product registers 71, 74, 76, and 77 are set to zero. Thus, syndromes so to S4 are held in registers 112, 113, 115, and 118. Since multi-plication and syndrome operation are realized with common circuits, the circuit scale is considerably reduced. |
