M29W160DB datasheet(13/29 Pages) STMICROELECTRONICS

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M29W160DT, M29W160DB

Write operation. During Erase Suspend the reset

command is ignored.

The Program/Erase Controller will suspend within

µs of the Erase Suspend Command being is-

sued. Once the Program/Erase Controller has

stopped the memory will be set to Read mode and

the Erase will be suspended. If the Erase Suspend

command is issued during the period when the

memory is waiting for an additional block (before

the Program/Erase Controller starts) then the

Erase is suspended immediately and will start im-

mediately when the Erase Resume Command is

issued. It will not be possible to select any further

blocks for erasure after the Erase Resume.

During Erase Suspend it is possible to Read and

Program cells in blocks that are not being erased;

both Read and Program operations behave as

normal on these blocks. Reading from blocks that

are being erased will output the Status Register. It

is also possible to enter the Auto Select mode: the

memory will behave as in the Auto Select mode on

all blocks until a Read/Reset command returns the

memory to Erase Suspend mode.

Erase Resume Command. The Erase Resume

command must be used to restart the Program/

Erase Controller from Erase Suspend. An erase

can be suspended and resumed more than once.

Security Data Command. The

Security

Data

command can be used to read the Security Mem-

ory Block. The Security Memory Block is a block of

256 words that is usually undefined. Volume cus-

tomers can request that a unique security code is

pre-programmed by ST into each part. One Bus

Write operation is required to issue the Security

Data command. Once the Security Data command

is issued Bus Read operations read from the Se-

curity Memory Block instead of the memory array,

until another command is issued.

After issuing the Security Data command from

Auto Select mode a Read/Reset command will re-

turn to Auto Select mode. An invalid command will

return to Read mode.

Valid addresses for the Security Memory Block are

given in Table 6, Security Memory Block Address-

es. Although the address for the Security Data

command is Don’t Care, it is necessary to choose

an address outside the Security Memory Block for

correct operation.

Table 6. Security Memory Block Addresses

Size

(words)

Address Range

(x8)

Address Range

(x16)

256

000000h-0001FFh

000000h-0000FFh

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