| 摘要 |
PURPOSE:To use the output result of a multiplier as an input to the multiplier immediately in a next machine cycle. CONSTITUTION:In the arithmetic unit which performs data transfer, multiplication, and ALU arithmetic by a pipeline system by cascading the multiplier 1 having two input and output latches 4 and a data ALU circuit 5 having two inputs, the output latch 4 of the multiplier 1 is connected to a selector 7 for one input of the data ALU circuit 5 and also connected to selectors 2 and 3 for two inputs of the multiplier 1, and a register file 8 and the output latch 4 of the multiplier 1 can be selected as the input to the multiplier 1. Then when continuous arithmetic processing for a three-term product, a four-term product, a five-term product, etc., is performed, the output of the output latch 4 can be supplied directly to the input of the multiplier 1 through the selectors 2 and 3 and the number of execution steps can greatly be decreased. |
