at45db021b ATMEL Corporation, at45db021b Datasheet - Page 16

• Manufacturer Part Number: at45db021b
• Description: At45db021b 2-megabit 2.7-volt Only Dataflash
• Manufacturer: ATMEL Corporation

9.3
Note:
9.4
Notes:
16
Reset Timing (Inactive Clock Polarity Low Shown)
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)
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.
AT45DB021B
RESET
SCK
SO
CS
SI
MSB
HIGH IMPEDANCE
larger densities
Reserved for
SI
r r r r r X X X
CMD
Page Address
(PA9-PA0)
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
t RST
t REC
HIGH IMPEDANCE
LSB
t CSS
1937J–DFLSH–9/05