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AT45DB081D Datasheet(PDF) 25 Page - ATMEL Corporation |
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AT45DB081D Datasheet(HTML) 25 Page - ATMEL Corporation |
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25 / 54 page  25 3596L–DFLASH–04/09 AT45DB081D 13. “Power of 2” Binary Page Size Option “Power of 2” binary page size Configuration Register is a user-programmable nonvolatile regis- ter that allows the page size of the main memory to be configured for binary page size (256 bytes) or DataFlash standard page size (264 bytes). The “power of 2” page size is a one- time programmable configuration register and once the device is configured for “power of 2” page size, it cannot be reconfigured again. The devices are initially shipped with the page size set to 264 bytes. The user has the option of ordering binary page size (256 bytes) devices from the factory. For details, please refer to Section 26. ”Ordering Information” on page 48. For the binary “power of 2” page size to become effective, the following steps must be followed: 1. Program the one-time programmable configuration resister using opcode sequence 3DH, 2AH, 80H and A6H (please see Section 13.1). 2. Power cycle the device (i.e. power down and power up again). 3. User can now program the page for the binary page size. If the above steps are not followed in setting the the page size prior to page programming, user may expect incorrect data during a read operation. The address format will be changed after the device is configured for “power of 2” page size. See Section 21.7 ”Command Sequence for Read/Write Operations for Page Size 256 Bytes (Except Status Register Read, Manufacturer and Device ID Read)” on page 39. 13.1 Programming the Configuration Register To program the Configuration Register for “power of 2” binary page size, 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 opcode sequence must be clocked into the device in the correct order. The 4-byte opcode sequence must start with 3DH and be followed by 2AH, 80H, and A6H. After the last bit of the opcode sequence has been clocked in, the CS pin must be deasserted to initiate the internally self-timed program cycle. The programming of the Configuration Register should take place in a time of tP, during which time the Status Register will indicate that the device is busy. The device must be power-cycled after the completion of the program cycle to set the “power of 2” page size. If the device is powered-down before the completion of the program cycle, then setting the Configuration Register cannot be guaranteed. However, the user should check bit 0 of the status register to see whether the page size was configured for binary page size. If not, the command can be re-issued again. Figure 13-1. Program Configuration Register Command Byte 1 Byte 2 Byte 3 Byte 4 Power of Two Page Size 3DH 2AH 80H A6H Opcode Byte 1 Opcode Byte 2 Opcode Byte 3 Opcode Byte 4 CS Each transition represents 8 bits SI |
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