M29DW128F datasheet(30/93 Pages) STMICROELECTRONICS

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6 Command Interface

M29DW128F

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6.1.8

Program Suspend command

The Program Suspend command allows the system to interrupt a program operation so that

data can be read from any block. When the Program Suspend command is issued during a

program operation, the device suspends the program operation within the Program Suspend

Latency time (see Table 18 for value) and updates the Status Register bits. The Bank

Addresses of the Block being programmed must be specified in the Program Suspend

command.

After the program operation has been suspended, the system can read array data from any

address. However, data read from Program-Suspended addresses is not valid.

The Program Suspend command may also be issued during a program operation while an

erase is suspended. In this case, data may be read from any addresses not in Erase Suspend

or Program Suspend. If a read is needed from the Extended Block area (One-time Program

area), the user must use the proper command sequences to enter and exit this region.

The system may also issue the Auto Select command sequence when the device is in the

Program Suspend mode. The system can read as many Auto Select codes as required. When

the device exits the Auto Select mode, the device reverts to the Program Suspend mode, and is

ready for another valid operation. See Auto Select command sequence for more information.

6.1.9

Program Resume command

After the Program Resume command is issued, the device reverts to programming. The

controller can determine the status of the program operation using the DQ7 or DQ6 status bits,

just as in the standard program operation. See Write Operation Status for more information.

The system must write the Program Resume command, specifying the Bank addresses of the

Program-Suspended Block, to exit the Program Suspend mode and to continue the

programming operation.

Further issuing of the Resume command is ignored. Another Program Suspend command can

be written after the device has resumed programming.

6.1.10 Program command

The Program command can be used to program a value to one address in the memory array at

a time. The command requires four Bus Write operations, the final Write operation latches the

address and data in the internal state machine and starts the Program/Erase Controller.

Programming can be suspended and then resumed by issuing a Program Suspend command

and a Program Resume command, respectively (see Program Suspend command and

Program Resume command paragraphs).

If the address falls in a protected block then the Program command is ignored, the data remains

unchanged. The Status Register is never read and no error condition is given.

After programming has started, Bus Read operations in the Bank being programmed output the

Status Register content, while Bus Read operations to the other Bank output the contents of

the memory array. See the section on the Status Register for more details. Typical program

times are given in Table 18.

After the program operation has completed the memory will return to the Read mode, unless an

error has occurred. When an error occurs Bus Read operations to the Bank where the

command was issued will continue to output the Status Register. A Read/Reset command must

be issued to reset the error condition and return to Read mode.

M29DW128F Datasheet(PDF) 30 Page - STMicroelectronics

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