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M58WR064HT Datasheet(PDF) 20 Page - Numonyx B.V |
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M58WR064HT Datasheet(HTML) 20 Page - Numonyx B.V |
20 / 111 page Command interface - Standard commands M58WR064HT, M58WR064HB 20/111 5.6 Block Erase Command The Block Erase command can be used to erase a block. It sets all the bits within the selected block to ’1’. All previous data in the block is lost. If the block is protected then the Erase operation will abort, the data in the block will not be changed and the Status Register will output the error. The Block Erase command can be issued at any moment, regardless of whether the block has been programmed or not. Two Bus Write cycles are required to issue the command. ● The first bus cycle sets up the Erase command. ● The second latches the block address in the Program/Erase Controller and starts it. If the second bus cycle is not Write Erase Confirm (D0h), Status Register bits SR4 and SR5 are set and the command aborts. Erase aborts if Reset turns to VIL. As data integrity cannot be guaranteed when the Erase operation is aborted, the block must be erased again. Once the command is issued the device outputs the Status Register data when any address within the bank is read. At the end of the operation the bank will remain in Read Status Register mode until a Read Array, Read CFI Query or Read Electronic Signature command is issued. During Erase operations the bank containing the block being erased will only accept the Read Array, Read Status Register, Read Electronic Signature, Read CFI Query and the Program/Erase Suspend command, all other commands will be ignored. Refer to Dual Operations section for detailed information about simultaneous operations allowed in banks not being erased. Typical Erase times are given in Table 16: Program/Erase times and endurance cycles. See Appendix C, Figure 23: Block Erase Flowchart and Pseudo Code, for a suggested flowchart for using the Block Erase command. 5.7 Program Command The memory array can be programmed word-by-word. Only one Word in one bank can be programmed at any one time. If the block is protected, the program operation will abort, the data in the block will not be changed and the Status Register will output the error. Two bus write cycles are required to issue the Program Command. ● The first bus cycle sets up the Program command. ● The second latches the Address and the Data to be written and starts the Program/Erase Controller. After programming has started, read operations in the bank being programmed output the Status Register content. During Program operations the bank being programmed will only accept the Read Array, Read Status Register, Read Electronic Signature, Read CFI Query and the Program/Erase Suspend command. Refer to Dual Operations section for detailed information about simultaneous operations allowed in banks not being programmed. Typical Program times are given in Table 16: Program/Erase times and endurance cycles. Programming aborts if Reset goes to VIL. As data integrity cannot be guaranteed when the program operation is aborted, the memory location must be reprogrammed. See Appendix C, Figure 19: Program Flowchart and Pseudo Code, for the flowchart for using the Program command. |
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