M58LR128GT datasheet(19/84 Pages) STMICROELECTRONICS

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M58LR128GT, M58LR128GB

The segments are programmed one Word at a

time. When shipped all bits in the segment 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

■

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 pro-

gram operation has started.

Attempting to program a previously protected Pro-

tection Register will result in a Status Register er-

ror.

The Protection Register Program cannot be sus-

pended. Dual operations between the Parameter

Bank and the Protection Register memory space

are not allowed (see Table 15., Dual Operation

Limitations for details).

The two Protection Register Locks are used to

protect the OTP segments from further modifica-

tion. The protection of the OTP segments is not re-

versible. Refer to Figure 5., Protection Register

Memory Map, and Figure 5., Protection Register

Memory Map, for details on the Lock bits.

See APPENDIX C., Figure 26., Protection Regis-

ter Program Flowchart and Pseudo Code, for a

flowchart for using the Protection Register Pro-

gram command.

Set Configuration Register Command

The Set Configuration Register command is used

to write a new value to the Configuration Register.

Two Bus Write cycles are required to issue the Set

Configuration Register command.

■

The first cycle sets up the Set Configuration

corresponding to the Configuration Register

content.

■

The second cycle writes the Configuration

The Configuration Register data must be written

as an address during the bus write cycles, that is

A0 = CR0, A1 = CR1, …, A15 = CR15. Addresses

A16- A22 are ignored.

Read operations output the array content after the

Set Configuration Register command is issued.

The Read Electronic Signature command is re-

quired to read the updated contents of the Config-

uration Register.

Block Lock Command

The Block Lock command is used to lock a block

and prevent program or erase operations from

changing the data in it. All blocks are locked after

power-up or reset.

Two Bus Write cycles are required to issue the

Block Lock command.

■

The first bus cycle sets up the Block Lock

command.

■

The second Bus Write cycle latches the block

address and locks the block.

The lock status can be monitored for each block

using the Read Electronic Signature command.

Table 16. shows the Lock Status after issuing a

Block Lock command.

Once set, the Block Lock bits remain set even after

a hardware reset or power-down/power-up. They

are cleared by a Block Unlock command.

Refer to the section, Block Locking, for a detailed

explanation.

See

APPENDIX

C.,

Figure

25., Locking Operations Flowchart and Pseudo

Code, for a flowchart for using the Lock command.

Block Unlock Command

The Block Unlock command is used to unlock a

block, allowing the block to be programmed or

erased.

Two Bus Write cycles are required to issue the

Block Unlock command.

■

The first bus cycle sets up the Block Unlock

command.

■

The second Bus Write cycle latches the block

address and unlocks the block.

The lock status can be monitored for each block

using the Read Electronic Signature command.

Table 16. shows the protection status after issuing

a Block Unlock command.

Refer to the section, Block Locking, for a detailed

explanation

and

APPENDIX

C.,

Figure

25., Locking Operations Flowchart and Pseudo

Code, for a flowchart for using the Block Unlock

command.

Block Lock-Down Command

The Block Lock-Down command is used to lock-

down a locked or unlocked block.

A locked-down block cannot be programmed or

erased. The lock status of a locked-down block

cannot be changed when WP is low, VIL. When

WP is high, VIH, the lock-down function is disabled

and the locked blocks can be individually unlocked

by the Block Unlock command.

Two Bus Write cycles are required to issue the

Block Lock-Down command.

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