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AT45DB321C-TI Datasheet(PDF) 8 Page - ATMEL Corporation |
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AT45DB321C-TI Datasheet(HTML) 8 Page - ATMEL Corporation |
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8 / 37 page  8 AT45DB321C [Preliminary] 3387B–DFLSH–9/04 Sector Protection Two protection methods, hardware and software controlled, are provided. The selection of which sectors to be protected/unprotected from program and erase operations is defined in the Sector Protection Register. SOFTWARE SECTOR PROTECTION: 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 com- mand. 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. 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 Disable Sector Protection command is ignored while the WP pin is asserted. Software Sector 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 pulled high internally) and sector protection can be controlled using the soft- ware commands. If the device is power cycled, then the Software Sector Protection will be disabled. Once the device is powered up, the Enable Sector Protection command should be reissued if sector protection is desired and if the WP pin is not used. The RESET pin has no effect on the Software Sector Protection. HARDWARE SECTOR PROTECTION: Sectors specified for protection in Sector Pro- tection Register can be protected from program and erase operations by utilizing the Write Protection (WP) pin. The protection can be enabled by asserting the WP pin and keeping the pin in its asserted state. Any sector specified for protection cannot be erased or reprogrammed as long as the WP pin is asserted. The protection can be dis- abled by deasserting the WP pin high. A filter is provided on the WP pin to help protect against spurious noise on the WP pin. Hardware Sector Protection will provide continu- ous protection, based on the contents of the Sector Protection Register, in an application where WP is always driven low. Please read the description of the WP pin on page 13 for more information. SECTOR PROTECTION REGISTER: Sector Protection Register is a nonvolatile regis- ter that contains 16 bytes of data, as shown below: Command Byte 1 Byte 2 Byte 3 Byte 4 Enable Sector Protection 3DH 2AH 7FH A9H Disable Sector Protection 3DH 2AH 7FH 9AH Read Sector Protection Register 32H 00H 00H 00H Sector Number 0 (0a, 0b) 1 to 15 Protected See Below FFH Unprotected 00H |
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