M29W128GH70N3E datasheet(54/94 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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Registers

M29W128GH, M29W128GL

54/94

before other commands are issued. The error bit is output on DQ5 when the status register

is read.

Note that the Program command cannot change a bit set to ’0’ back to ’1’ and attempting to

do so will set DQ5 to ‘1’. A bus read operation to that address will show the bit is still ‘0’. One

of the erase commands must be used to set all the bits in a block or in the whole memory

from ’0’ to ’1’.

7.2.4

Erase timer bit (DQ3)

The erase timer bit can be used to identify the start of program/erase controller operation

during a Block Erase command. Once the program/erase controller starts erasing the erase

timer bit is set to ’1’. Before the program/erase controller starts the erase timer bit is set to ’0’

and additional blocks to be erased may be written to the command interface. The erase

timer bit is output on DQ3 when the status register is read.

7.2.5

Alternative toggle bit (DQ2)

The alternative toggle bit can be used to monitor the program/erase controller during erase

operations. The alternative toggle bit is output on DQ2 when the status register is read.

During chip erase and block erase operations the toggle bit changes from ’0’ to ’1’ to ’0’,

etc., with successive bus read operations from addresses within the blocks being erased. A

protected block is treated the same as a block not being erased. Once the operation

completes the memory returns to read mode.

During erase suspend the alternative toggle bit changes from ’0’ to ’1’ to ’0’, etc. with

successive bus read operations from addresses within the blocks being erased. Bus read

operations to addresses within blocks not being erased will output the memory array data as

if in read mode.

After an erase operation that causes the error bit to be set, the alternative toggle bit can be

used to identify which block or blocks have caused the error. The alternative toggle bit

changes from ’0’ to ’1’ to ’0’, etc. with successive bus read operations from addresses within

blocks that have not erased correctly. The alternative toggle bit does not change if the

addressed block has erased correctly.

7.3

Buffered program abort bit (DQ1)

The buffered program abort bit, DQ1, is set to ‘1’ when a write to buffer program or

enhanced buffered program operation aborts. The Buffered Program Abort and Reset

command must be issued to return the device to read mode (see write to buffer program in

Section 6.1: Standard commands).

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