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M28W640ECT Datasheet(PDF) 13 Page - STMicroelectronics |
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M28W640ECT Datasheet(HTML) 13 Page - STMicroelectronics |
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13 / 55 page  13/55 M28W640ECT, M28W640ECB During Program/Erase Suspend the Command In- terface will accept the Program/Erase Resume, Read Array, Read Status Register, Read Electron- ic Signature and Read CFI Query commands. Ad- ditionally, if the suspend operation was Erase then the Program, Double Word Program, Quadruple Word Program, Block Lock, Block Lock-Down or Protection Program commands will also be ac- cepted. The block being erased may be protected by issuing the Block Protect, Block Lock or Protec- tion Program commands. When the Program/ Erase Resume command is issued the operation will complete. Only the blocks not being erased may be read or programmed correctly. During a Program/Erase Suspend, the device can be placed in a pseudo-standby mode by taking Chip Enable to VIH. Program/Erase is aborted if Reset turns to VIL. See Appendix C, Figure 20, Program Suspend & Resume Flowchart and Pseudo Code, and Figure 22, Erase Suspend & Resume Flowchart and Pseudo Code for flowcharts for using the Program/ Erase Suspend command. Program/Erase Resume Command The Program/Erase Resume command can be used to restart the Program/Erase Controller after a Program/Erase Suspend operation has paused it. One Bus Write cycle is required to issue the command. Once the command is issued subse- quent Bus Read operations read the Status Reg- ister. See Appendix C, Figure 20, Program Suspend & Resume Flowchart and Pseudo Code, and Figure 22, Erase Suspend & Resume Flowchart and Pseudo Code for flowcharts for using the Program/ Erase Resume command. Protection Register Program Command The Protection Register Program command is used to Program the 128 bit user One-Time-Pro- grammable (OTP) segment of the Protection Reg- ister. The segment is programmed 16 bits at a time. When shipped all bits in the segment are set to ‘1’. The user can only program the bits to ‘0’. Two write cycles are required to issue the Protec- tion Register Program command. s The first bus cycle sets up the Protection Register Program command. s The second latches the Address and the Data to be written to the Protection Register and starts the Program/Erase Controller. Read operations output the Status Register con- tent after the programming has started. The segment can be protected by programming bit 1 of the Protection Lock Register (see Figure 6, Protection Register Memory Map). Attempting to program a previously protected Protection Regis- ter will result in a Status Register error. The pro- tection of the Protection Register is not reversible. The Protection Register Program cannot be sus- pended. 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. s The first bus cycle sets up the Block Lock command. s 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. s The first bus cycle sets up the Block Unlock command. s 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. s The first bus cycle sets up the Block Lock command. s 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 |
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