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M29DW323DT70N1 Datasheet(PDF) 17 Page - STMicroelectronics |
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M29DW323DT70N1 Datasheet(HTML) 17 Page - STMicroelectronics |
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17 / 49 page  17/49 M29DW323DT, M29DW323DB blocks are protected the Chip Erase operation ap- pears to start but will terminate within about 100µs, leaving the data unchanged. No error condition is given when protected blocks are ignored. During the erase operation the memory will ignore all commands, including the Erase Suspend com- mand. It is not possible to issue any command to abort the operation. Typical chip erase times are given in Table 7. All Bus Read operations during the Chip Erase operation will output the Status Register on the Data Inputs/Outputs. See the sec- tion on the Status Register for more details. After the Chip Erase operation has completed the memory will return to the Read Mode, unless an error has occurred. When an error occurs the memory will continue to output the Status Regis- ter. A Read/Reset command must be issued to re- set the error condition and return to Read Mode. The Chip Erase Command sets all of the bits in un- protected blocks of the memory to ’1’. All previous data is lost. Block Erase Command The Block Erase command can be used to erase a list of one or more blocks in a Bank. It sets all of the bits in the unprotected selected blocks to ’1’. All previous data in the selected blocks is lost. Six Bus Write operations are required to select the first block in the list. Each additional block in the list can be selected by repeating the sixth Bus Write operation using the address of the additional block. All blocks must belong to the same Bank; if a block belonging to the other Bank is given it will not be erased. The Block Erase operation starts the Program/Erase Controller after a time-out pe- riod of 50µs after the last Bus Write operation. Once the Program/Erase Controller starts it is not possible to select any more blocks. Each addition- al block must therefore be selected within 50µs of the last block. The 50µs timer restarts when an ad- ditional block is selected. After the sixth Bus Write operation a Bus Read operation within the same Bank will output the Status Register. See the Sta- tus Register section for details on how to identify if the Program/Erase Controller has started the Block Erase operation. If any selected blocks are protected then these are ignored and all the other selected blocks are erased. If all of the selected blocks are protected the Block Erase operation appears to start but will terminate within about 100µs, leaving the data un- changed. No error condition is given when protect- ed blocks are ignored. During the Block Erase operation the memory will ignore all commands except the Erase Suspend command and the Read/Reset command which is only accepted during the 50µs time-out period. Typical block erase times are given in Table 7. After the Erase operation has started all Bus Read operations to the Bank being erased will output the Status Register on the Data Inputs/Outputs. See the section on the Status Register for more details. After the Block Erase operation has completed the memory will return to the Read Mode, unless an error has occurred. When an error occurs Bus Read operations to the Bank where the command was issued will continue to output the Status Reg- ister. A Read/Reset command must be issued to reset the error condition and return to Read mode. Erase Suspend Command The Erase Suspend Command may be used to temporarily suspend a Block Erase operation and return the memory to Read mode. The command requires one Bus Write operation. The Program/Erase Controller will suspend within the Erase Suspend Latency time of the Erase Sus- pend Command being issued. Once the Program/ Erase Controller has stopped the memory will be set to Read mode and the Erase will be suspend- ed. If the Erase Suspend command is issued dur- ing the period when the memory is waiting for an additional block (before the Program/Erase Con- troller starts) then the Erase is suspended immedi- ately and will start immediately 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. During Erase Suspend a Bus Read operation to the Extended Block will output the Extended Block data. Erase Resume Command The Erase Resume command must be used to re- start the Program/Erase Controller after an Erase Suspend. The device must be in Read Array mode before the Resume command will be accepted. An erase can be suspended and resumed more than once. |
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