M29DW128F60NF1F NUMONYX [Numonyx B.V], M29DW128F60NF1F Datasheet - Page 23
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M29DW128F60NF1F
Manufacturer Part Number
M29DW128F60NF1F
Description
128 Mbit (16Mb x8 or 8Mb x16, Multiple Bank, Page, Boot Block) 3V supply Flash memory
Manufacturer
NUMONYX [Numonyx B.V]
Datasheet
1.M29DW128F60NF1F.pdf
(94 pages)
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M29DW128F
5
5.1
5.1.1
Software Protection
The M29DW128F has two different Software Protection modes: the Standard Protection
mode and the Password Protection mode.
On first use all parts default to the Standard Protection mode and the customer is free to
activate the Standard or the Password Protection mode.
The desired protection mode is activated by setting one of two one-time programmable bits,
the Standard Protection Mode Lock bit or the Password Protection Mode Lock bit.
Programming the Standard and the Password Protection Mode Lock bit to ‘1’ will
permanently activate the Standard Protection mode and the Password Protection mode,
respectively. These two bits are one-time programmable and non-volatile, once the
Protection mode has been programmed, it cannot be changed and the device will
permanently operate in the selected Protection mode. It is recommended to activate the
desired Software Protection mode when first programming the device.
The device is shipped with all blocks unprotected. The Block Protection Status can be read
by issuing the Auto Select command (see
The Standard and Password Protection modes offer two levels of protection, a Block
Lock/Unlock protection and a Non-Volatile protection.
For the four outermost parameter blocks, an even higher level of block protection can be
achieved by locking the blocks using the Non-Volatile Protection and then by holding the
V
Standard Protection mode
Block Lock/Unlock Protection
It is a flexible mechanism to protect/unprotect a block or a group of blocks from program or
erase operations.
A volatile Lock bit is assigned to each block or group of blocks. When the lock bit is set to ‘1’
the associated block or group of blocks is protected from program/erase operations, when
the Lock bit is set to ‘0’ the associated block or group of blocks is unprotected and can be
programmed or erased.
The Lock bits can be set (‘1’) and cleared (‘0’) individually as often as required by issuing a
Set Lock Bit command and Clear Lock bit command, respectively.
After a Power-up or Hardware Reset, all the Lock bits are cleared to ‘0’ (block unlocked).
PP
/WP pin Low.
Table 10: Block Protection status
Software Protection
).
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