| 摘要 |
PURPOSE:To suppress the unnecessary report of a fault by masking fault detecting outputs at every byte data with the output of a flag register holding effective/ineffective information at every byte data of transferred data. CONSTITUTION:A fault detecting circuit 12 checks the data inputted from a buffer 11 at every byte data and outputs it to a mask circuit 14 by detecting faults at every byte data. The flag register 13 holds temporarily effective byte data information when data is sent from a data supplying part and sends the output of a byte data part to the mask circuit 14. The mask circuit 14 sends the output masked by using the fault detecting results and the effective/ ineffective information at every byte data to a NAND gate 15. The NAND gate 15 ORs the output of the mask circuit 14. Thus, the unnecessary report of the fault can be suppressed and a system with high reliability can be realized. |
