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M58WR064HT Datasheet(PDF) 26 Page - Numonyx B.V |
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M58WR064HT Datasheet(HTML) 26 Page - Numonyx B.V |
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26 / 111 page  Command interface - Factory program commands M58WR064HT, M58WR064HB 26/111 6 Command interface - Factory program commands The Factory Program commands are used to speed up programming. They require VPP to be at VPPH except for the Bank Erase command which also operates at VPP = VDD. Refer to Table 7: Factory Program Commands, in conjunction with the following text descriptions. The use of Factory Program commands requires certain operating conditions. ● VPP must be set to VPPH (except for Bank Erase command), ● VDD must be within operating range, ● Ambient temperature, TA must be 25°C ± 5°C, ● The targeted block must be unlocked. 6.1 Bank Erase Command The Bank Erase command can be used to erase a bank. It sets all the bits within the selected bank to ’1’. All previous data in the bank is lost. The Bank Erase command will ignore any protected blocks within the bank. If all blocks in the bank are protected then the Bank Erase operation will abort and the data in the bank will not be changed. The Status Register will not output any error. Bank Erase operations can be performed at both VPP = VPPH and VPP = VDD. Two Bus Write cycles are required to issue the command. ● The first bus cycle sets up the Bank Erase command. ● The second latches the bank address in the Program/Erase Controller and starts it. If the second bus cycle is not Write Bank 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 bank 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 Bank Erase operations the bank being erased will only accept the Read Array, Read Status Register, Read Electronic Signature and Read CFI Query command, all other commands will be ignored. For optimum performance, Bank Erase commands should be limited to a maximum of 100 Program/Erase cycles per Block. After 100 Program/Erase cycles the internal algorithm will still operate properly but some degradation in performance may occur. Dual Operations are not supported during Bank Erase operations and the command cannot be suspended. Typical Erase times are given in Table 16: Program/Erase times and endurance cycles. |
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