M29W128 View Datasheet(PDF) - Numonyx -> Micron

Part Name

Description

Manufacturer

M29W128

128 Mbit 3V Supply Flash Memory

Numonyx -> Micron 

Command interface

M29W128FH, M29W128FL

5.3

5.3.1

5.3.2

Extended Memory Block Protection commands

The M29W128F offers a set of commands to access the Extended Memory Block and to

configure and check its protection mode.

The commands related to the Extended Memory Block Protection are available in both 8 bit

and 16 bit memory configuration.

Enter Extended Memory Block command

The M29W128F has one extra 128 Word block (Extended Memory Block) that can only be

accessed using the Enter Extended Memory Block command.

Three Bus Write cycles are required to issue the Extended Memory Block command. Once

the command has been issued the device enters the Extended Memory Block mode where

all Bus Read or Program operations are conducted on the Extended Memory Block. Once

the device is in the Extended Block mode, the Extended Memory Block is addressed by

using the addresses occupied by block 0 in the other operating modes (see Table 28: Block

Addresses and Protection Groups).

The device remains in Extended Block mode until the Exit Extended Block command is

issued or power is removed from the device. After power-up or a hardware reset, the device

reverts to the Read mode where commands issued to block 0 address space will address

block 0.

Note that when the device is in the Extended Block mode, the VPP/WP pin cannot be used

for fast programming and the Unlock Bypass mode is not available.

The Extended Memory Block cannot be erased, and can be treated as one-time

programmable (OTP) memory.

In Extended Block mode, Erase, Chip Erase, Erase Suspend and Erase resume commands

are not allowed.

To exit from the Extended Block mode the Exit Extended Block command must be issued.

The Extended Memory Block can be protected by setting the Extended Memory Block

Protection Bit to ‘1’; however once protected the protection cannot be undone.

Exit Extended Block command

The Exit Extended Block command is used to exit from the Extended Block mode and return

the device to Read mode. Four Bus Write operations are required to issue the command.

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