JPS6023379B

PURPOSE:To indicate retrying operation by detecting the presence of an error while sending read information from a memory unit to a processor regardless of whether the information has an error or not, and then by interrupting the process of the processor when the error is detected. CONSTITUTION:Information 3 read out from memory part 11 by access request 1 from CPU is inputted to check circuit 12 and error correction circuit 13. Since error correction circuit 13 is normally OFF, it is sent as read information 5 of MS to CPU and processed there. In parallel to this, check circuit 12 checks read information 3 and if an error is detected, error signal 6 is sent to retrying control circuit 14 of CPU, thereby indicating the retrying operation of the pre-processing of CPU. Then, CPU indicates the transmission of retrying signal 2 to retrying control circuit 14 to put error correction circuit 13 into operation, and retrying command signal 7 actuates access generating circuit 15 to send request 1 from CPU to MS.