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MX25L6408E Datasheet(PDF) 11 Page - Macronix International |
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MX25L6408E Datasheet(HTML) 11 Page - Macronix International |
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11 / 49 page  11 P/N: PM1643 REV. 1.4, DEC. 09, 2013 MX25L6408E DATA PROTECTION During power transition, there may be some false system level signals which result in inadvertent erasure or programming. The device is designed to protect itself from these accidental write cycles. The state machine will be reset as standby mode automatically during power up. In addition, the control register architecture of the device constrains that the memory contents can only be changed after specific command sequences have completed successfully. In the following, there are several features to protect the system from the accidental write cycles during VCC power- up and power-down or from system noise. • Valid command length checking: The command length will be checked whether it is at byte base and completed on byte boundary. • Write Enable (WREN) command: WREN command is required to set the Write Enable Latch bit (WEL) before other command to change data. The WEL bit will return to reset stage under following situation: - Power-up - Write Disable (WRDI) command completion - Write Status Register (WRSR) command completion - Page Program (PP) command completion - Sector Erase (SE) command completion - Block Erase (BE) command completion - Chip Erase (CE) command completion • Deep Power Down Mode: By entering deep power down mode, the flash device also is under protected from writing all commands except Release from deep power down mode command (RDP) and Read Electronic Sig- nature command (RES). • Advanced Security Features: there are some protection and security features which protect content from inad- vertent write and hostile access. I. Block lock protection - The Software Protected Mode (SPM): MX25L6408E: use (BP3, BP2, BP1, BP0) bits to allow part of memory to be protected as read only. The protect- ed area definition is shown as table of "Protected Area Sizes", the protected areas are more flexible which may protect various area by setting value of BP0-BP3 bits. Please refer to table of "protected area sizes". - The Hardware Proteced Mode (HPM) uses WP# to protect the MX25L6408E: BP3-BP0 bits and SRWD bit. |
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