AT45DB ATMEL Corporation, AT45DB Datasheet - Page 11

• Manufacturer Part Number: AT45DB
• Description: 1-Megabit 2.7-volt Only Serial DataFlash
• Manufacturer: ATMEL Corporation

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
SO
CS
SI
Each transition represents
8 bits and 8 clock cycles
CMD
CS
SO
SI
PAGE (264 BYTES)
r ···r , PA8-7
SO
CS
SI
CMD
PA6-0, BA8
CMD
X
MAIN MEMORY
FLASH MEMORY ARRAY
BA7-0
BUFFER (264 BYTES)
PAGE TO
BUFFER
X···X, BFA8
BUFFER
r ···r , PA8-7
I/O INTERFACE
READ
SO
X
Starts reading page data into buffer
BFA7-0
PA6-0, X
X
X
X
MAIN MEMORY
PAGE READ
X
n
n+1
X
n = 1st byte read
n+1 = 2nd byte read
n
n+1
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