M29DW128G70NF6E NUMONYX, M29DW128G70NF6E Datasheet - Page 23

• Manufacturer Part Number: M29DW128G70NF6E
• Description: P7ED TSOP56 DUAL BANK
• Manufacturer: NUMONYX

M29DW128G
Note:
Figure 5.
1. NVPBs default to ‘1’ (block unprotected) after power-up and hardware reset. A block is protected or unprotected when its
2. VPB default status depends on ordering option. A block is protected or unprotected when its VPB is set to ‘0’ and ‘1’,
3. The NVPB Lock bit is volatile and default to ‘1’ (NVPB bits unlocked) after power-up and hardware reset. NVPB bits are
NVPB is set to ‘0’ and ‘1’, respectively. NVPBs are programmed individually and cleared collectively.
respectively. VPBs are programmed and cleared individually. For the volatile protection to be effective, the NVPB lock bit
must be set to ‘0’ (NVPB bits unlocked) and the block NVPB must be set to ‘1’ (block unprotected).
locked by setting the NVPB lock bit to ‘0’. Once programmed to ‘0’, the NVPB lock bit can be reset to ‘1’ only be taking the
device through a power-up or hardware reset.
Parameter block or
main block
Refer to
There is no means to verify the password after it is set. If the password is lost after setting
the password mode lock bit, there is no way to clear the NVPB lock bit.
Software protection scheme
programmed it cannot be erased, the device permanently remains in password
protection mode, and the 64-bit password can neither be retrieved nor reprogrammed.
Moreover, all commands to the address where the password is stored, are disabled.
Refer to
details on the block protection scheme.
Section 7.3.4
Table 14: Block protection status
Non-volatile protection
Volatile protection
for a description of the password protection mode command set.
VPB (2)
NVPB (1)
and
Figure 5: Software protection scheme
NVPB Lock bit (3)
Software protection
Password protection
protection mode
Non-volatile
mode
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