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M29F800DT Datasheet(PDF) 13 Page - STMicroelectronics |
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M29F800DT Datasheet(HTML) 13 Page - STMicroelectronics |
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13 / 39 page  13/39 M29F800DT, M29F800DB Read mode. The command requires one Bus Write operation. The Program/Erase Controller will suspend within the Erase Suspend Latency Time (refer to Table 6 for value) of the Erase Suspend Command being issued. Once the Program/Erase Controller has stopped the memory will be set to Read mode and the Erase will be suspended. If the Erase Suspend command is issued during the period when the memory is waiting for an additional block (before the Program/Erase Controller starts) then the Erase is suspended immediately and will start im- mediately when the Erase Resume Command is issued. It is not possible to select any further blocks to erase after the Erase Resume. During Erase Suspend it is possible to Read and Program cells in blocks that are not being erased; both Read and Program operations behave as normal on these blocks. If any attempt is made to program in a protected block or in the suspended block then the Program command is ignored and the data remains unchanged. The Status Register is not read and no error condition is given. Read- ing from blocks that are being erased will output the Status Register. It is also possible to issue the Auto Select, Read CFI Query and Unlock Bypass commands during an Erase Suspend. The Read/Reset command must be issued to return the device to Read Array mode before the Resume command will be ac- cepted. Erase Resume Command. The Erase Resume command must be used to restart the Program/ Erase Controller from Erase Suspend. An erase can be suspended and resumed more than once. Read CFI Query Command. The Read CFI Query Command is used to read data from the Common Flash Interface (CFI) Memory Area. This command is valid when the device is ready to read the array data or when the device is in autoselect- ed mode. One Bus Write cycle is required to issue the Read CFI Query Command. Once the command is is- sued subsequent Bus Read operations read from the Common Flash Interface Memory Area. The Read/Reset command must be issued to return the device to Read Array mode. See Appendix B, Tables 21, 22, 23, 24, 25 and for details on the in- formation contained in the Common Flash Inter- face (CFI) memory area. Block Protect and Chip Unprotect Commands. Each block can be separately protected against accidental Program or Erase. The whole chip can be unprotected to allow the data inside the blocks to be changed. Block Protect and Chip Unprotect operations are described in Appendix C. |
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