| 摘要 |
PURPOSE:To speedily detect only a fixed fault separately from the error of a software by providing a comparing means to compare the respective address and syndrome of a holding object with the address and syndrome held in preceding time and the holding/informing means of error information. CONSTITUTION:When data are partially written or read and an error, which can be corrected, is generated, comparator circuits 5 and 6 are activated through an AND gate 10. Next, the circuit 5 compares the address from a timing adjusting circuit 1 with the address under holding in an address holding circuit 3 and only when the addresses are coincident, an output is increased to be high. The comparator circuit 6 compares the syndrome from the circuit 1 with the syndrome under holding in a syndrome holding circuit 4 and only when the syndrome is coincident, the output is increased to be high. When the outputs of the circuits 5 and 6 simultaneously rise up to be high, namely, when it is discriminated that the error is continuously generated in the same bit position of the same address, such a state is considered as the fixed fault and the error information are held and notified. Then, only the fixed fault can be speedily detected separately, from the error of the software. |
