| 摘要 |
PURPOSE:To speed up a multiplier by inputting two numeral data consisting of the combination of binary values and carry information, multiplying respective parts, adding the multiplied results, and then outputting the added results as a binary value and carry information. CONSTITUTION:A value A set in a multiplied register 6 and respective bits of a multiplying register 8 are respectively inputted to a circuits 91-93 for obtaining secondary booth algorithm or a circuit 10 for obtaining modified secondary booth algorithm to find out partial products, which are inputted to an adder 12. Partial products between a value (a) of a carry information register 7 and respective bits in the multiplying register 8 are found out by an one-bit multiplier 11 and inputted to the adder 12. Since data having a similar format to the output of a carry holding adder can be used as I/O data, the addition of carries may be executed only at the final time of a series of arithmetic processing and the multiplying processing can be speeded up. |
