RC28F128M29EWLA NUMONYX, RC28F128M29EWLA Datasheet - Page 27

• Manufacturer Part Number: RC28F128M29EWLA
• Description: IC FLASH 128MBIT 25NS 64BGA
• Manufacturer: NUMONYX
• Series: Axcell™r

Specifications of RC28F128M29EWLA

• Format - Memory: FLASH
• Memory Type: FLASH
• Memory Size: 128M (16Mx8, 8Mx16)
• Speed: 60ns
• Interface: Parallel
• Voltage - Supply: 2.7 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-BGA
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Numonyx
5.2.2
Note:
5.3
Note:
1
2
®
Axcell™ M29EW
Non-Volatile Protection Bit Lock bit
The Non-Volatile Protection Bit Lock bit (NVPB Lock bit) is a global volatile bit for all NVPBs.
When set (programmed to ‘0’), it prevents changing the state of the NVPBs. When reset 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
No software command unlocks this bit unless the device is in password protection mode; in
standard non-volatile Protection mode, it can be cleared only by taking the device through a
hardware reset or a power-up.
The NVPB Lock bit must be set (programmed to ‘0’) only after all NVPBs are configured to
the desired settings.
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 incorrect, the NVPB 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.
2.
Refer to
There is no means to verify the password after Password Protection mode is enabled. If the
password is lost after enabling the Password Protection mode, there is no way to clear the
NVPB Lock bit.
Prior to activating the password protection mode, it is necessary to set a 64-bit
password and to verify it (see
command). Password verification is only allowed before the password protection mode
is activated.
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
for details on the block protection scheme.
Section 6.3.6
Section 6.3.4
Table 16: Block Protection Status
for a description of the NVPB Lock bit command set.
for a description of the Password Protection mode command set.
Password Program command
208031-04
and
Figure 9: Software protection scheme
and
Password Read
Software Protection
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