at45db321d-su-sl955 ATMEL Corporation, at45db321d-su-sl955 Datasheet - Page 40

• Manufacturer Part Number: at45db321d-su-sl955
• Description: 32-megabit 2.7-volt Dataflash
• Manufacturer: ATMEL Corporation

23. Read Operations
The following block diagram and waveforms illustrate the various read sequences available.
23.1
23.2
40
SO (OUTPUT)
Main Memory Page Read
Main Memory Page to Buffer Transfer (Data from Flash Page Read into Buffer)
SI (INPUT)
AT45DB321D [Preliminary]
SO (OUTPUT)
SI (INPUT)
CS
CS
MAIN MEMORY
PAGE (512/528 BYTES)
BUFFER 1 (512/528 BYTES)
BUFFER 1
BUFFER 1
PAGE TO
CMD
READ
ADDRESS FOR BINARY PAGE SIZE
CMD
A21-A16
PA12-6
PA5-0, BA9-8
FLASH MEMORY ARRAY
A15-A8
I/O INTERFACE
PA12-6
SO
A7-A0
BA7-0
MAIN MEMORY
PAGE READ
A21-A9 + 9 DON'T CARE BITS
BINARY PAGE SIZE
BUFFER 2 (512/528 BYTES)
X
4 Dummy Bytes
PA5-0, XX
Starts reading page data into buffer
MAIN MEMORY
PAGE TO
BUFFER 2
BUFFER 2
READ
X
XXXX XXXX
n
n+1
3597I–DFLASH–8/07