AT45DB021D_07 Datasheet, PDF (40/52 Pages) ATMEL Corporation – 2-megabit 2.7-volt DataFlash

23. Read Operations
The following block diagram and waveforms illustrate the various read sequences available.
FLASH MEMORY ARRAY
PAGE (256/264 BYTES)
MAIN MEMORY
PAGE TO
BUFFER
BUFFER (256/264 BYTES)
BUFFER
READ
MAIN MEMORY
PAGE READ
I/O INTERFACE
SO
23.1 Main Memory Page Read
CS
ADDRESS FOR BINARY PAGE SIZE
A17-A16
A15-A8
A7-A0
SI (INPUT)
CMD
PA9-7
PA6-0, BA8
BA7-0
X
X
SO (OUTPUT)
4 Dummy Bytes
n
n+1
23.2 Main Memory Page to Buffer Transfer (Data from Flash Page Read into Buffer)
Starts reading page data into buffer
CS
SI (INPUT)
BINARY PAGE SIZE
6 DON’T CARE BITS + A17-A8 + 8 DON'T CARE BITS
CMD
X···X, PA9-7
PA6-0, X
XXXX XXXX
SO (OUTPUT)
40 AT45DB021D [Preliminary]
3638B–DFLASH–02/07