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M58LV064A Datasheet(PDF) 27 Page - STMicroelectronics |
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M58LV064A Datasheet(HTML) 27 Page - STMicroelectronics |
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27 / 65 page  27/65 M58LV064A, M58LV064B Set Burst Configuration Register Command. The Set Burst Configuration Register command is used to write a new value to the Burst Configura- tion Control Register which defines the burst length, type, X and Y latencies, Synchronous/ Asynchronous Read mode and the valid Clock edge configuration. Two Bus Write cycles are required to issue the Set Burst Configuration Register command. Once the command is issued the memory returns to Read mode as if a Read Memory Array command had been issued. The value for the Burst Configuration Register is always presented on A2-A17, regardless of the bus width that is selected. M0 is on A2, M1 on A3, etc.; the other address bits are ignored. Block Protect Command. The Block Protect command is used to protect a block and prevent Program or Erase operations from changing the data in it. Two Bus Write cycles are required to is- sue the Block Protect command; the second Bus Write cycle latches the block address in the inter- nal state machine and starts the Program/Erase Controller. Once the command is issued subse- quent Bus Read operations read the Status Reg- ister. See the section on the Status Register for details on the definitions of the Status Register bits. During the Block Protect operation the memory will only accept the Read Status Register command. All other commands will be ignored. Typical Block Protection times are given in Table 11. The Block Protection bits are non-volatile, once set they remain set through reset and power- down/power-up. They are cleared by a Blocks Un- protect command or temporary disabled by raising the Reset/Power-Down pin to VHH and holding it at that level throughout a Block Erase or Write to Buffer and Program command. Blocks Unprotect Command. The Blocks Un- protect command is used to unprotect all of the blocks. Two Bus Write cycles are required to issue the Blocks Unprotect command; the second Bus Write cycle starts the Program/Erase Controller. Once the command is issued subsequent Bus Read operations read the Status Register. See the section on the Status Register for details on the definitions of the Status Register bits. During the Block Unprotect operation the memory will only accept the Read Status Register com- mand. All other commands will be ignored. Typical Block Protection times are given in Table 11. |
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