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
MAIN MEMORY
PAGE TO
BUFFER 1
BUFFER 2
BUFFER 1 (256/264 BYTES)
BUFFER 2 (256/264 BYTES)
BUFFER 1
READ
MAIN MEMORY
PAGE READ
BUFFER 2
READ
I/O INTERFACE
SO
23.1 Main Memory Page Read
CS
ADDRESS FOR BINARY PAGE SIZE
A15-A8
A19-A16
A7-A0
SI (INPUT)
PA11-7
BA7-0
X
X
PA6-0, BA8
CMD
4 Dummy Bytes for Serial
SO (OUTPUT)
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
BINARY PAGE SIZE
A19-A8 + 8 DON'T CARE BITS
CMD
PA11-7
SI (INPUT)
PA6-0, X
XXXX XXXX
SO (OUTPUT)
40
AT45DB081D
3596E–DFLASH–02/07
ATMEL [ ATMEL ]
