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AT45DB321D Datasheet(PDF) 12 Page - ATMEL Corporation |
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AT45DB321D Datasheet(HTML) 12 Page - ATMEL Corporation |
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12 / 55 page  12 3597H–DFLASH–02/07 AT45DB321D [Preliminary] 8.1 Software Sector Protection 8.1.1 Enable Sector Protection Command Sectors specified for protection in the Sector Protection Register can be protected from program and erase operations by issuing the Enable Sector Protection command. To enable the sector protection using the software controlled method, the CS pin must first be asserted as it would be with any other command. Once the CS pin has been asserted, the appropriate 4-byte command sequence must be clocked in via the input pin (SI). After the last bit of the command sequence has been clocked in, the CS pin must be deasserted after which the sector protection will be enabled. Figure 8-1. Enable Sector Protection 8.1.2 Disable Sector Protection Command To disable the sector protection using the software controlled method, the CS pin must first be asserted as it would be with any other command. Once the CS pin has been asserted, the appropriate 4-byte sequence for the Disable Sector Protection command must be clocked in via the input pin (SI). After the last bit of the command sequence has been clocked in, the CS pin must be deasserted after which the sector protection will be disabled. The WP pin must be in the deasserted state; otherwise, the Disable Sector Protection command will be ignored. Figure 8-2. Disable Sector Protection 8.1.3 Various Aspects About Software Controlled Protection Software controlled protection is useful in applications in which the WP pin is not or cannot be controlled by a host processor. In such instances, the WP pin may be left floating (the WP pin is internally pulled high) and sector protection can be controlled using the Enable Sector Protection and Disable Sector Protection commands. If the device is power cycled, then the software controlled protection will be disabled. Once the device is powered up, the Enable Sector Protection command should be reissued if sector pro- tection is desired and if the WP pin is not used. Command Byte 1 Byte 2 Byte 3 Byte 4 Enable Sector Protection 3DH 2AH 7FH A9H Opcode Byte 1 Opcode Byte 2 Opcode Byte 3 Opcode Byte 4 CS Each transition represents 8 bits SI Command Byte 1 Byte 2 Byte 3 Byte 4 Disable Sector Protection 3DH 2AH 7FH 9AH Opcode Byte 1 Opcode Byte 2 Opcode Byte 3 Opcode Byte 4 CS Each transition represents 8 bits SI |
Similar Part No. - AT45DB321D_07 |
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Similar Description - AT45DB321D_07 |
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