AT45DB021 ATMEL Corporation, AT45DB021 Datasheet - Page 8

• Manufacturer Part Number: AT45DB021
• Description: 2-Megabit 2.7-volt Only Serial DataFlash
• Manufacturer: ATMEL Corporation

Reset Timing (Inactive Clock Polarity Low Shown)
Command Sequence for Read/Write Operations (Except Status Register Read)
Notes:
8
2.
3.
1.
RESET
SCK
“r” designates bits reserved for larger densities.
It is recommended that “r” be a logical “0” for densities of 2M bit or smaller.
For densities larger than 2M bit, the “r” bits become the most significant Page Address bit for the appropriate density.
SO
CS
SI
AT45DB021
MSB
HIGH IMPEDANCE
larger densities
Reserved for
SI
r r r X X X X X
Page Address
(PA11-PA0)
CMD
X X X X X X X X
8 bits
8 bits
(BA8-BA0/BFA8-BFA0)
Byte/Buffer Address
X X X X X X X X
8 bits
tRST
tREC
HIGH IMPEDANCE
LSB
tCSS