ADDRESS LINE FAULT TREATING APPARATUS, ADDRESS LINE FAULT TREATING METHOD, ADDRESS LINE FAULT TREATING PROGRAM, INFORMATION PROCESSING APPARATUS AND MEMORY CONTROLLER

摘要

An address line substituting circuit (14) in which a branch address line branched off from a lower address line (SA[0] to SA[4]) connected to a lower bit of a memory (6) is connected to an upper address line (SA[5];SA[6]) connected to an upper bit other than the lower bit, and that switches between an input from the upper address line (SA[5];SA[6]) and an input from the branch address line, and outputs any of the inputs to the upper bit is provided. When an address line (A[0] to A[6]) connected to each bit is examined, and a failed address line is specified, the address line substituting circuit (14) is instructed to switch from the upper address line to the branch address line branched off from the failed address line. Thereby, a significant decrease in memory capacity due to memory degeneration can be avoided even when a failure has occurred in an address line of the memory (6).