AT45DB321D datasheet(25/57 Pages) ATMEL

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3597N–DFLASH–04/09

AT45DB321D

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

(512 bytes) or DataFlash standard page size (528 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 528 bytes. The user has the option of ordering binary page size (512

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. The page for the binary page size can now be programmed.

If the above steps are not followed to set the page size prior to page programming, incorrect

data during a read operation may be encountered.

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. Erase Sector Protection 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

Each transition

represents 8 bits

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