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M28W160CT Datasheet(PDF) 13 Page - STMicroelectronics |
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M28W160CT Datasheet(HTML) 13 Page - STMicroelectronics |
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13 / 50 page  13/50 M28W160CT, M28W160CB The Protection Register Program cannot be sus- pended. See Appendix C, Figure 23, Protection Register Program Flowchart and Pseudo Code, for the flowchart for using the Protection Register Program command. 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 at 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. The lock status can be monitored for each block using the Read Electronic Signature command. Table. 10 shows the protection status after issuing a Block Lock command. The Block Lock bits are volatile, once set they re- main set until a hardware reset or power-down/ power-up. They are cleared by a Blocks Unlock command. Refer to the section, Block Locking, for a detailed explanation. Block Unlock Command The Blocks Unlock command is used to unlock a block, allowing the block to be programmed or erased. Two Bus Write cycles are required to is- sue the Blocks 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. 10 shows the protection status after issuing a Block Unlock command. Refer to the section, Block Locking, for a detailed explanation. Block Lock-Down Command A locked 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 com- mand. 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. 10 shows the protection sta- tus after issuing a Block Lock-Down command. Refer to the section, Block Locking, for a detailed explanation. |
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