AT45DB081E datasheet(21/97 Pages) RENESAS

21 / 97 page

DS-AT45DB081E-028 Rev. M

Page 21

8/16/22

AT45DB081E Datasheet

7.1

Buffer Write

Utilizing the Buffer Write command allows data clocked in from the SI pin to be written directly into either one of

the SRAM data buffers.

To load data into a buffer using the standard DataFlash buffer size (264 bytes), an opcode of 84h for Buffer 1 or

87h for Buffer 2 must be clocked into the device followed by three address bytes comprised of 15 dummy bits and

nine buffer address bits (BFA8 - BFA0). The nine buffer address bits specify the first byte in the buffer to be

written.

To load data into a buffer using the binary buffer size (256 bytes), an opcode of 84h for Buffer 1 or 87h for Buffer 2,

must be clocked into the device followed by 16 dummy bits and eight buffer address bits (BFA7 - BFA0). The eight

buffer address bits specify the first byte in the buffer to be written.

After the last address byte has been clocked into the device, data can then be clocked in on subsequent clock

cycles. If the end of the data buffer is reached, the device wraps around back to the beginning of the buffer. Data

continue to be loaded into the buffer until a low-to-high transition is detected on the CS pin.

AT45DB081E Datasheet(PDF) 21 Page - Renesas Technology Corp