M29W128GL60N6E View Datasheet(PDF) - Numonyx -> Micron

Part Name

Description

Manufacturer

M29W128GL60N6E

128 Mbit (16 Mb x 8 or 8 Mbx 16, page, uniform block) 3 V supply Flash memory

Numonyx -> Micron 

M29W128GH, M29W128GL

Software protection

Refer to Table 19: Block protection status and Figure 5: Software protection scheme for

details on the block protection mechanism, and to Section 6.3.5 for a description of the Non-

volatile Protection mode command set.

5.2.2 Non-volatile Protection Bit Lock bit

The Non-volatile Protection Bit Lock bit (NVPB Lock bit) is a global volatile bit for all blocks.

When set (programmed to ‘0’), it prevents changing the state of the NVPBs. When cleared

(programmed to ‘1’), the NVPBs can be set and reset using the NVPB Program command

and Clear all NVPBs command, respectively.

There is only one NVPB Lock bit per device.

Refer to Section 6.3.6 for a description of the NVPB Lock bit command set.

Note: 1 No software command unlocks this bit unless the device is in password protection mode; it

can be cleared only by taking the device through a hardware reset or a power-up.

2 The NVPB Lock bit must be set (programmed to ‘0’) only after all NVPBs are configured to

the desired settings.

5.3

Note:

Password protection mode

The password protection mode provides an even higher level of security than the Non-

volatile Protection mode by requiring a 64-bit password for unlocking the device NVPB Lock

bit.

In addition to this password requirement, the NVPB Lock bit is set ‘0’ after power-up and

reset to maintain the device in password protection mode. Successful execution of the

Password Unlock command by entering the correct password clears the NVPB Lock bit,

allowing for block NVPBs to be modified.

If the password provided is not correct, the NVPL Lock bit remains locked and the state of

the NVPBs cannot be modified.

To place the device in password protection mode, the following steps are required:

1. Prior to entering the password protection mode, it is necessary to set a 64-bit password

and to verify it (see Password Program command and Password Read command).

Password verification is only allowed during the password programming operation

2. The password protection mode is then activated by programming the Password

Protection Mode Lock bit to ‘0’. This operation is not reversible and once the bit is

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 Table 19: Block protection status and Figure 5: Software protection scheme for

details on the block protection scheme.

Refer to Section 6.3.4 for a description of the Password Protection mode command set.

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.

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