METHOD AND DEVICE FOR EXTENDED ERROR PROCESSING FOR I/O LOADING/STORING OPERATION ON PCI DEVICE BY ILLEGAL PARITY OR 0-BYTE ENABLING

PROBLEM TO BE SOLVED: To prevent damage due to a bus error in loading operation or storing operation through the identification of a device which encountered an error before by using forcible illegal data parity or 0-byte enabling. SOLUTION: Device select lines from respective I/O devices 132 and 134 are connected individually to a PCT host bridge 124 and if an error occurs on a PCI(peripheral component interconnect) bus, the device number of the faulty device is recorded in an error register 204. Following loading operation and storing operation are suspended until the error register is reset and until the device number of the object device is checked in the error register. If the object device got out of order before, the completion of the loading/storing operation on the device is stopped by forcing the illegal parity or setting all of byte enabling to zero. The I/O devices activate their device select lines when the illegal parity of 0-byte enabling is forced to answer a load request or store request, but accept no store data.