| 摘要 |
PURPOSE:To easily perform the rounding processing at bit positions regardless of accuracy by shifting right a mantissa part by a degree equal to the number of bits corresponding to the desired accuracy and fixing an omitting position. CONSTITUTION:A register 10 stores a mantissa part of the floating points supplied from a terminal 10a. A right-shift circuit 11 shifts the mantissa part to the right in accordance with the accuracy of conversion. In this case, a higher rank bit is set at 0 and all bits to be shifted undergo the OR arithmetic for production of state key bits. These key bits undergo the OR arithmetic to the lowest rank bit of the circuit 11 after said right shift is through. Then the lower three bits of the circuit 11 are supplied to a rounding circuit 12 to receive the rounding processing and are added together with the higher tank bits through an adder 13. the result of this addition is shifted left by a left-shift circuit 15 by a degree equal to the same number of bits as those shifted right by the circuit 11 and outputted through a terminal 16. |
