at45db081b ATMEL Corporation, at45db081b Datasheet - Page 17

• Manufacturer Part Number: at45db081b
• Description: 8-megabit 2.5-volt Only Or 2.7-volt Only Dataflash
• Manufacturer: ATMEL Corporation

Read
Operations
Main Memory Page Read
Main Memory Page to Buffer Transfer (Data from Flash Page Read into Buffer)
Buffer Read
2225J–DFLSH–2/08
Each transition represents
SO
CS
SI
8 bits and 8 clock cycles
CMD
SO
CS
SI
MAIN MEMORY
PAGE (264 BYTES)
BUFFER 1 (264 BYTES)
The following block diagram and waveforms illustrate the various read sequences available.
r r r , PA11-7
BUFFER 1
BUFFER 1
CS
SO
PAGE TO
SI
READ
CMD
PA6-0, BA8
CMD
X
FLASH MEMORY ARRAY
BA7-0
r r r , PA11-7
X···X, BFA8
I/O INTERFACE
SO
X
MAIN MEMORY
PAGE READ
Starts reading page data into buffer
BFA7-0
PA6-0, X
X
BUFFER 2 (264 BYTES)
X
X
X
n
MAIN MEMORY
PAGE TO
BUFFER 2
BUFFER 2
READ
n+1
X
AT45DB081B
n = 1st byte read
n+1 = 2nd byte read
n
n+1
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