M58LR128HT datasheet(29/112 Pages) STMICROELECTRONICS

Part #	M58LR128HT

Description	128 Mbit (8 Mb 횞16, Multiple Bank, Multilevel interface, Burst) 1.8 V supply Flash memories

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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M58LR128HT, M58LR128HB

Command interface

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4.17

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.

●

The first bus cycle sets up the Block Lock-Down command.

●

The second Bus Write cycle latches the block address and locks-down the block.

The lock status can be monitored for each block using the Read Electronic Signature

command.

Locked-Down blocks revert to the locked (and not locked-down) state when the device is

reset on power-down. Table 16 shows the Lock Status after issuing a Block Lock-Down

command.

Refer to the section, Block Locking, for a detailed explanation and Appendix C, Figure 25:

Locking Operations flowchart and pseudocode, for a flowchart for using the Lock-Down

command.

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