23. Read Operations
The following block diagram and waveforms illustrate the various read sequences available.
FLASH MEMORY ARRAY
PAGE (512/528 BYTES)
MAIN MEMORY
PAGE TO
MAIN MEMORY
PAGE TO
BUFFER 1
BUFFER 2
BUFFER 1 (512/528 BYTES)
BUFFER 2 (512/528 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
A21-A16
A7-A0
SI (INPUT)
PA12-6
BA7-0
X
X
PA5-0, BA9-8
CMD
4 Dummy Bytes
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
A21-A9 + 9 DON'T CARE BITS
CMD
PA12-6
SI (INPUT)
PA5-0, XX
XXXX XXXX
SO (OUTPUT)
40
AT45DB321D
3597J–DFLASH–4/08
ATMEL [ ATMEL ]
