RC28F128M29EWLA NUMONYX, RC28F128M29EWLA Datasheet - Page 26

• 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

Software Protection
5.1
5.2
5.2.1
Note:
26
1
2
Volatile Protection mode
The volatile Protection allows the software application to easily protect blocks against
inadvertent change. However, the protection can be easily disabled when changes are
needed. Volatile Protection bits, VPBs, are volatile and unique for each block and can be
individually modified. VPBs only control the protection scheme for unprotected blocks that
have their non-volatile Protection bits, NVPBs, cleared (erased to ‘1’) (see
Volatile Protection mode
By issuing the VPB Program or VPB Clear commands, the VPBs are set (programmed to
‘0’) or cleared (erased to ‘1’), thus placing associated blocks in the protected or unprotected
state respectively. The VPBs can be set (programmed to ‘0’) or cleared (erased to ‘1’) as
often as needed.
When the parts are first shipped, or after a power-up or hardware reset, the VPBs default to
be cleared.
Refer to
Non-Volatile Protection mode
Non-Volatile Protection bits
A non-volatile Protection bit (NVPB) is assigned to each block.
When a NVPB is set to ‘0’, the associated block is protected, preventing any program or
erase operations in this block.
The NVPB bits can be set individually by issuing a NVPB Program command. They are non-
volatile and will remain set through a hardware reset or a power-down/power-up sequence.
The NVPBs cannot be cleared individually, they can only be all cleared at the same time by
issuing a Clear all Non-Volatile Protection bits command.
The NVPBs can be protected all at a time by setting a volatile bit, the NVPB Lock bit (see
Section 5.2.2: Non-Volatile Protection Bit Lock
If one of the non-volatile protected blocks needs to be unprotected (corresponding NVPB
set to ‘1’), a few more steps are required:
1.
2.
3.
To achieve the best protection, it is recommended to execute the NVPB Lock Bit Program
command early in the boot code and to protect the boot code by holding V
The NVPBs and VPBs have the same function when V
when V
Refer to
details on the block protection mechanism, and to
Volatile Protection mode command set.
First, the NVPB Lock bit must be ‘1’ by either putting the device through a power cycle,
or hardware reset.
The NVPBs can then be changed to reflect the desired settings.
The NVPB Lock bit must be set to ‘0’ once again to lock the NVPBs by associated
command. The device operates normally again.
PP
Section 6.3.7
Table 16: Block Protection Status
/WP# pin is at the voltage for program acceleration (V
for a description of the volatile Protection mode command set.
and
Section 6.3.5: Non-Volatile Protection mode command
208031-04
and
bit).
Figure 9: Software protection scheme
Section 6.3.5
PP
/WP# pin is High, V
Numonyx
for a description of the Non-
PPH
).
®
Axcell™ M29EW
Section 5.2: Non-
PP
/WP# Low, V
IH
, as they do
set).
for
IL
.