| 摘要 |
PURPOSE:To enable high speed arithmetic operation with simple control by constituting a Galois field computing element by a vector index conversion circuit, an index vector conversion circuit, a NOT circuit switching multiplication/division and an adder circuit using modulo 2<n-1>. CONSTITUTION:A control section 41 is provided, which analyzes a command on a system bus 40 and outputs control signals 41a-41d. Moreover, registers 42-1, 42-2 storing an n-bit data based on the signals 41a, 41b and vector index conversion circuits 43-1, 43-2 converting the outputs into a data of exponential expression are formed. Furthermore, a NOT circuit to an output of the circuit 43-2 based on the control signal 41c such as a multiplication/divison circuit 44, a circuit 45 using a modulo 2<n-1> to add outputs of the circuits 44 and 43-1, and a register 47 outputting the output of the index vector conversion circuit 46 to a bus 40 are formed. Through the simple constitution as above, high speed Galois field anthmetic operation is enabled.
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