M29W128GH70N3E datasheet(26/94 Pages) NUMONYX

Part #	M29W128GH70N3E

Description	128-Mbit (16 Mbit x8 or 8 Mbit x16, page, uniform block) 3 V supply flash memory

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Manufacturer	NUMONYX [Numonyx B.V]

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26 / 94 page

Software protection

M29W128GH, M29W128GL

26/94

Figure 5.

Software protection scheme

1.

NVPBs default to ‘1’ (block unprotected) after power-up and hardware reset. A block is protected or unprotected when its

NVPB is set to ‘0’ and ‘1’, respectively. NVPBs are programmed individually and cleared collectively.

2.

VPB default status depends on ordering option. A block is protected or unprotected when its VPB is set to ‘0’ and ‘1’,

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).

3.

The NVPB lock bit is volatile and default to ‘1’ (NVPB bits unlocked) after power-up and hardware reset. NVPB bits are

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.

AI13676

Parameter block or

main block

NVPB(1)

VPB(2)

Non-volatile

protection mode

Volatile protection

Non-volatile protection

Password protection

mode

NVPB Lock bit(3)

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