at45db321d-su-sl955 ATMEL Corporation, at45db321d-su-sl955 Datasheet - Page 39

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

22. Write Operations
The following block diagram and waveforms illustrate the various write sequences available.
22.1
22.2
3597I–DFLASH–8/07
SI (INPUT)
Buffer Write
Buffer to Main Memory Page Program (Data from Buffer Programmed into Flash Page)
CS
SI (INPUT)
CS
represents 8 bits
Each transition
PAGE PROGRAM
BUFFER 1 (512/528 BYTES)
MAIN MEMORY
PAGE (512/528 BYTES)
BUFFER 1 TO
CMD
BUFFER 1
WRITE
X
15 DON'T CARE + BFA8-BFA0
CMD
BINARY PAGE SIZE
X···X, BFA9-8
FLASH MEMORY ARRAY
I/O INTERFACE
PA12-6
Starts self-timed erase/program operation
BFA7-0
SI
A21-A9 + 9 DON'T CARE BITS
BINARY PAGE SIZE
AT45DB321D [Preliminary]
BUFFER 2 (512/528 BYTES)
n
PA5-0, XX
Completes writing into selected buffer
n+1
BUFFER 2 TO
MAIN MEMORY
PAGE PROGRAM
BUFFER 2
WRITE
XXXX XX
n = 1st byte read
n+1 = 2nd byte read
Last Byte
39