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M58WT032KB Datasheet(PDF) 26 Page - Numonyx B.V |
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M58WT032KB Datasheet(HTML) 26 Page - Numonyx B.V |
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26 / 117 page  Command interface - standard commands M58WTxxxKT, M58WTxxxKB 26/117 5.13 Block Unlock command The Block Unlock command unlocks 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. 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 Section 11: Block locking for a detailed explanation and Appendix C, Figure 26: Locking operations flowchart and pseudo code for a flowchart for using the Unlock command. 5.14 Block Lock-Down command A locked or unlocked block can be locked down by issuing the Block Lock-Down command. A locked-down block cannot be programmed or erased, or have its protection status 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 command. ● The second bus write cycle latches the block address. 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 Section 11: Block locking for a detailed explanation and Appendix C, Figure 26: Locking operations flowchart and pseudo code for a flowchart for using the Lock-Down command. |
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