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M29DW641F Datasheet(PDF) 22 Page - Numonyx B.V |
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M29DW641F Datasheet(HTML) 22 Page - Numonyx B.V |
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22 / 80 page  Software Protection M29DW641F 22/80 5.1.2 Non-volatile Protection A Non-Volatile Modify Protection bit is assigned to each block or group of blocks. When a Non-Volatile Modify Protection bit is set to ‘1’, the associated block or group of blocks is protected, preventing any Program or Erase Operations in this block or group of blocks. The Non-Volatile Modify Protection bits are set individually by issuing a Set Non-Volatile Modify Protection bit command. They are non-volatile and will remain set through a hardware reset or a power-down/power-up sequence. The Non-Volatile Modify Protection bits cannot be cleared individually, they can only be cleared all at the same time by issuing a Clear Non-Volatile Modify Protection bits command. The device features a volatile Lock-Down bit which can be used to prevent changing the state of the Non-Volatile Modify Protection bits. When set to ‘1’, the Non-Volatile Modify Protection bits can no longer be modified; when set to ‘0’, the Non-Volatile Modify Protection bits can be set and reset using the Set Non-Volatile Modify Protection bit command and the Clear Non-Volatile Modify Protection bits command, respectively. The Lock-Down bit is set by issuing the Set Lock-Down bit command. It is not cleared using a command, but through a hardware reset or a power-down/power-up sequence. The part is shipped with the Non-Volatile Modify Protection bits set to ‘0’. Locked blocks and Non-Volatile Locked blocks can co-exist in the same memory array. Refer to Table 7: Block Protection status and Figure 6: Software Protection scheme for details on the block protection mechanism. 5.2 Password Protection mode The Password Protection mode provides a more advanced level of software protection than the Standard Protection mode. Prior to entering the Password Protection mode, it is necessary to set a password and to verify it (see Section 6.3.5: Password Program command and Section 6.3.6: Password Verify command). The Password Protection mode is then activated by programming the Password Protection mode Lock bit to ‘1’. This operation is not reversible and once the bit is programmed the device will permanently remain in the Password Protection mode. The Password Protection mode uses the same protection mechanisms as the Standard Protection mode (Block Lock/Unlock, Non-volatile Protection). 5.2.1 Block Lock/Unlock Protection The Block Lock/Unlock Protection operates exactly in the same way as in the Standard Protection mode. |
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