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S34ML01G1 数据表(PDF) 60 Page - Cypress Semiconductor |
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S34ML01G1 数据表(HTML) 60 Page - Cypress Semiconductor |
60 / 71 page Document Number: 002-00676 Rev. *V Page 60 of 71 S34ML01G1 S34ML02G1 S34ML04G1 9.2 Bad Block Management Devices with Bad Blocks have the same quality level and the same AC and DC characteristics as devices where all the blocks are valid. A Bad Block does not affect the performance of valid blocks because it is isolated from the bit line and common source line by a select transistor. The devices are supplied with all the locations inside valid blocks erased (FFh). The Bad Block Information is written prior to shipping. Any block where the 1st byte in the spare area of the 1st or 2nd or last page does not contain FFh is a Bad Block. That is, if the first page has an FF value and should have been a non-FF value, then the non-FF value in the second page or the last page will indicate a bad block.The Bad Block Information must be read before any erase is attempted, as the Bad Block Information may be erased. For the system to be able to recognize the Bad Blocks based on the original information, it is recommended to create a Bad Block table following the flowchart shown in Figure 55. The host is responsible to detect and track bad blocks, both factory bad blocks and blocks that may go bad during operation. Once a block is found to be bad, data should not be written to that block.The 1st block, which is placed on 00h block address is guaranteed to be a valid block. Figure 55. Bad Block Management Flowchart Note 84. Check for FFh at the 1st byte in the spare area of the 1st, 2nd, and last pages. Yes Yes No No Start Block Address= Block 0 Data =FFh? Last Block? End Increment Block Address Update Bad Block Table [84] |
类似零件编号 - S34ML01G1 |
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类似说明 - S34ML01G1 |
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