| 摘要 |
PROBLEM TO BE SOLVED: To provide an arithmetic unit which multiplies a decimal digit by suppressing the increase of a circuit area and to provide a multiplying unit. SOLUTION: The value of a binary number having 4 bits is input as a signal Ain [3:0] and a signal Bin [3:0] to a binary number multiplier 21. The binary number multiplier 21 multiplies the input two values, and outputs its product as a signal Xout [7:0]. A six times compensator 22 multiplies a signal Xout [7:4] by six times, and outputs a signal Cin [7:0]. A BCD converter 23 adds (6)d when the 4 less significant bits of the signal Xout [7:0] is 10 or more, and outputs a signal Din [7:0]. A decimal number adder 24 adds the signal Cin [7:0] to the signal Din [7:0], and outputs the sum as a signal BcdFaOut [7:0]. COPYRIGHT: (C)2005,JPO&NCIPI
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