suppliers of SL1013 and PDF data of SL1013

Identifying Invalid Block(s) All device locations are erased(FFh for X8, FFFFh for X16) except locations where the invalid block(s) information is written prior to shipping. The invalid block(s) status is defined by the lst byte(X8 device) or lst word(X16 device) in the spare area. Samsung makes sure that either the lst or 2nd page of every invalid block has non-FFh(X8) or non-FFFFh(X16) data at the column address of 2048(X8 device) or 1024(X16 device). Since the invalid block information is also erasable in most cases, it is impossible to recover the information once it has been erased. Therefore, the system must be able to recognize the invalid block(s) based on the original invalid block information and create the invalid block table via the following suggested flow chart(Figure 3). Any intentional erasure of the original invalid block information is prohibited.