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S34ML01G1 Datasheet(数据表) 60 Page - Cypress Semiconductor

部件型号  S34ML01G1
说明  1 Gb/2 Gb/4 Gb, 3 V, SLC NAND Flash for Embedded
下载  71 Pages
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制造商  CYPRESS [Cypress Semiconductor]
网页  http://www.cypress.com
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S34ML01G1 Datasheet(HTML) 60 Page - Cypress Semiconductor

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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]




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