M29W640FT datasheet(22/72 Pages) STMICROELECTRONICS

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4 Command Interface

M29W640FT, M29W640FB

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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.

4.1.9

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, 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.

4.1.10 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, 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 Section 4.1.8: Program Suspend

command and Section 4.1.9: Program Resume command).

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.

During the program operation the memory will ignore all commands. It is not possible to issue

any command to abort or pause the operation. Typical program times are given in Table 7:

Program, Erase Times and Program, Erase Endurance Cycles. Bus Read operations during

the program operation will output the Status Register on the Data Inputs/Outputs. See the

section on the Status Register for more details.

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

error has occurred. When an error occurs the memory will continue to output the Status

Read mode.

Note that the Program command cannot change a bit set at

’0’ back to ’1’. 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’.

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