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GD9FS1G8F2AMG データシート(PDF) 11 Page - GigaDevice Semiconductor (Beijing) Inc. |
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GD9FS1G8F2AMG データシート(HTML) 11 Page - GigaDevice Semiconductor (Beijing) Inc. |
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11 / 55 page  GD9Fx1GxF2A 11 5.3 Factory Defect Mapping The Flash array is not presumed to be pristine, and a number of defects that makes the blocks unusable may be present. Invalid blocks shall be sorted out from normal blocks by software. 5.3.1. Device Requirements If a block is defective, the manufacturer shall mark the block as defective by setting the Defective Block Marking, as shown in Figure of “Area marked in first or last page of block indicating defect”, of the last page of the defective block to a value of non ‐FFh. The Defective Block Marking is located on the first byte of user data area or the first byte of spare data area in the pages within a block. 0 1 2 0 1 2 1st page Last page The 1st byte of spare region The 1st byte of spare region Defective Block Marking Figure 7. Area marked in first or last page of block indicating defect sequential figures |
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