15

AT45DB021B

1937F–DFLSH–10/02

Reset Timing (Inactive Clock Polarity Low Shown)

Note:

The CS signal should be in the high state before the RESET signal is deasserted.

Command Sequence for Read/Write Operations (except Status Register Read)

Notes:

1. “r” designates bits reserved for larger densities.

2. It is recommended that “r” be a logical “0” for densities of 2M bits or smaller.

3. For densities larger than 2M bits, the “r” bits become the most significant Page Address bit for the appropriate density.

CS

SCK

RESET

SO

HIGH IMPEDANCE

HIGH IMPEDANCE

SI

tRST

tREC

tCSS

SI

CMD

8 bits

8 bits

8 bits

MSB

Reserved for

larger densities

Page Address

(PA9-PA0)

Byte/Buffer Address

(BA8-BA0/BFA8-BFA0)

LSB

r r r r r X X X

X X X X X X X X

X X X X X X X X