| 摘要 |
PURPOSE:To enable an FAM size to be reduced by address compression and time for judgment for rescuing fault to be reduced by allowing a plurality of memory cells of a memory to be measured to correspond to one memory cell of a memory for analyzing fault (FAM) based on a specified rule. CONSTITUTION:Data signal from an algorithmic pattern generator is written to a corresponding region of a memory to be measured 50 which is specified for an address signal, this data is read out and is compared with an output of a generator 2 are a comparator 4, a fault signal is outputted when they do not match, and it is written into an FAM 8. In this case, a plurality of address signals are assigned as an address signal of one memory cell by an address allocation circuit 6, thus enabling a plurality of faulty memory cells to be allocated to one memory cell. This address compression allows a size of the FAM to be reduced and judgment time through the FAM for rescuing fault can be reduced. |
