| 摘要 |
PROBLEM TO BE SOLVED: To provide a reading circuit in a data bus to be used in a computer system or the like capable of quickening a reading time for reading the same data from a plurality of registers or the like, and for confirming the data by comparing the data with an expected value. SOLUTION: This data reading circuit for reading a plurality of data through a data bus is provided with a logical sum means for calculating the logical sum of those data when there is not any inversion signal, and for outputting the logical sum data to the data bus and a logical product means for calculating the logical product of those data by inverting the data when there is any inversion signal, and for outputting the logical product data to the data bus.
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