MEMORY REFRESH DEVICE AND MEMORY REFRESH METHOD

摘要

The optimization of a refresh cycle is carried out in harmony with the error occurrence state in the memory with the presence of a normal patrol controlling section (24) controlling a normal patrol operation that patrols the memory (11); an additional patrol controlling section (25) controlling an additional patrol operation that patrols, if a first error in the memory (11) is detected during the normal patrol operation, an error occurring area in which the first error has occurred and which is included in the memory (11); a measuring section (15) measuring, if a second error is detected in the error occurring area during the additional patrol operation, an error frequency representing information of error in the error occurring area; and a refresh cycle adjusting section (26) adjusting the refresh cycle in accordance with the error frequency measured by the measuring section (15)