| 摘要 |
PURPOSE:To avoid an error correction failure by turning ON a modifying bit with respect to data concerned in a buffer memory when a bit error is corrected and moved in the error memory. CONSTITUTION:The move -in data MID transmitted from a main memory MEM is checked whether it has an bit error or not by an error checking circuit CHK. If it has the error, the error-corrected data by the correcting circuit CRCT is selected and outputted. As a signal FOUND is at a level L, the output of a selector SL4 turns out to be a read data RD to an access request source REQ through gates G2 and G3. With the conventional techniques, conditions turning ON the demodified bit M of a memory TAG at the time of moving in only covers the case of a write request, however, said bit M can be turned ON when the the operation detects a bit error in a read request mode. |
