Rainbow Electronics AT45DB321D - Manual (Page 40)

40
3597J–DFLASH–4/08
AT45DB321D
23. Read Operations
The following block diagram and waveforms illustrate the various read sequences available.
23.1 Main Memory Page Read
23.2 Main Memory Page to Buffer Transfer (Data from Flash Page Read into Buffer)
FLASH MEMORY ARRAY
PAGE (512/528 BYTES)
BUFFER 2 (512/528 BYTES) BUFFER 1 (512/528 BYTES)
I/O INTERFACE
MAIN MEMORY
PAGE TO
BUFFER 1
MAIN MEMORY
PAGE TO
BUFFER 2
MAIN MEMORY
PAGE READ BUFFER 1
READ
BUFFER 2
READ
SO
SI (INPUT) CMD PA12-6 PA5-0, BA9-8 X
CS
n n+1 SO (OUTPUT)
BA7-0
4 Dummy Bytes
X
ADDRESS FOR BINARY PAGE SIZE
A21-A16 A15-A8 A7-A0
Starts reading page data into buffer
SI (INPUT) CMD PA12-6 PA5-0, XX
CS
SO (OUTPUT)
XXXX XXXX
BINARY PAGE SIZE
A21-A9 + 9 DON'T CARE BITS