M58PR256J datasheet(29/114 Pages) STMICROELECTRONICS

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M58PR256J, M58PR512J

Command interface

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4.14

Program/Erase Resume command

The Program/Erase Resume command is used to restart the program or erase operation

suspended by the Program/Erase Suspend command. One Bus Write cycle is required to

issue the command. The command can be issued to any address.

The Program/Erase Resume command does not change the read mode of the banks. If the

suspended bank was in Read Status Register, Read Electronic signature or Read CFI

Query mode the bank remains in that mode and outputs the corresponding data.

If a Program command is issued during a Block Erase Suspend, then the erase cannot be

resumed until the program operation has completed.

See Appendix C, Figure 22: Program Suspend & Resume flowchart and pseudo code and

Figure 24: Erase Suspend & Resume flowchart and pseudo code, for flowcharts for using

the Program/Erase Resume command.

4.15

Protection Register Program command

The Protection Register Program command is used to program the user One-Time-

Programmable (OTP) area of the Protection Register and the two Protection Register Locks.

The device features 16 OTP areas of 128 bits and one OTP area of 64 bits, as shown in

Figure 4: Protection Register memory map.

The areas are programmed one Word at a time. When shipped all bits in the area are set to

‘1’. The user can only program the bits to ‘0’.

Two Bus Write cycles are required to issue the Protection Register Program command.

●

The first bus cycle sets up the Protection Register Program command.

●

The second latches the address and data to be programmed to the Protection Register

and starts the Program/Erase Controller.

Read operations to the bank being programmed output the Status Register content after the

program operation has started.

Attempting to program a previously protected Protection Register will result in a Status

The Protection Register Program cannot be suspended. Dual operations between the

Extended Flash Array (EFA) and the Protection Register memory space are not allowed

(see Table 20: Dual operation limitations for details).

The two Protection Register Locks are used to protect the OTP areas from further

modification. The protection of the OTP areas is not reversible. Refer to Figure 4: Protection

See Appendix C, Figure 27: Protection Register Program flowchart and pseudo code, for a

flowchart for using the Protection Register Program command.

M58PR256J Datasheet(PDF) 29 Page - STMicroelectronics