| 摘要 |
PURPOSE:To increase input bit number via a simple circuit without losing high speed properties by deciding the absolute value of the input data and controlling the bit length of the input data applied to a multiplication device. CONSTITUTION:An input selector 2 consists of a gate means 21 which decides whether the input data is larger than 8 bit or not based on the absolute value of the input data and a gate means 22 which selects the n-th bit input or the (n+1)-th bit input among the input bits based on the deciding result of the means 21 and outputs it as the n-th bit output. Thus the selector 2 has a func tion to change the 8-bit input into the 7-bit one. While an output selector 3 has a function to convert the 16-bit result obtained by compressing the 8-bit data into the 7-bit one with calculation into an 18-bit output so as to obtain the same result as the data calculated in 8 bits. |
