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AT45DB021-JI Datasheet(PDF) 10 Page - ATMEL Corporation

Part # AT45DB021-JI
Description  2-Megabit 2.7-volt Only Serial DataFlash
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT45DB021-JI Datasheet(HTML) 10 Page - ATMEL Corporation

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AT45DB021
10
Read Operations
The following block diagram and waveforms illustrate the various read sequences available.
Main Memory Page Read
Main Memory Page to Buffer Transfer (Data from Flash Page Read into Buffer)
Buffer Read
FLASH MEMORY ARRAY
PAGE (264 BYTES)
BUFFER 2 (264 BYTES)
BUFFER 1 (264 BYTES)
I/O INTERFACE
MAIN MEMORY
PAGE TO
BUFFER 1
MAIN MEMORY
PAGE TO
BUFFER 2
MAIN MEMORY
PAGE READ
BUFFER 1
READ
BUFFER 2
READ
SO
SI
CMD
PA6-0, BA8
BA7-0
X
X
X
X
CS
n
n+1
SO
r r r, PA11-7
SI
CMD
PA6-0, X
X
Starts reading page data into buffer
CS
SO
r r r, PA11-7
SI
CMD
X
X···X, BFA8
BFA7-0
CS
n
n+1
SO
X
Each transition represents
8 bits and 8 clock cycles
n = 1st byte read
n+1 = 2nd byte read


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