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11. Read Operations
The following block diagram and waveforms illustrate the various read sequences available.
FLASH MEMORY ARRAY
PAGE (264 BYTES)
MAIN MEMORY
PAGE TO
BUFFER 1
BUFFER 1 (264 BYTES)
MAIN MEMORY
PAGE TO
BUFFER 2
BUFFER 2 (264 BYTES)
11.1
CS
Main Memory Page Read
BUFFER 1
READ
MAIN MEMORY
PAGE READ
I/O INTERFACE
SO
BUFFER 2
READ
SI
CMD
r r r r r, PA9-7
PA6-0, BA8
BA7-0
X
X
X
X
SO
11.2
n
Main Memory Page to Buffer Transfer (Data from Flash Page Read into Buffer)
Starts reading page data into buffer
CS
n+1
SI
CMD
r r r r r, PA9-7
PA6-0, X
X
SO
11.3
Buffer Read
CS
SI
CMD
X
X···X, BFA8
BFA7-0
X
SO
Each transition represents
8 bits and 8 clock cycles
AT45DB021B
18
n
n+1
n = 1st byte read
n+1 = 2nd byte read
1937J–DFLSH–9/05
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