AT45DB021D_09 Datasheet, PDF (40/54 Pages) ATMEL Corporation – 2-megabit 2.7-volt Minimum DataFlash

22. Write Operations
The following block diagram and waveforms illustrate the various write sequences available.
FLASH MEMORY ARRAY
PAGE (256/264 BYTES)
BUFFER TO
MAIN MEMORY
PAGE PROGRAM
BUFFER (256/264 BYTES)
BUFFER
WRITE
I/O INTERFACE
22.1 Buffer Write
CS
SI (INPUT)
SI
CMD
BINARY PAGE SIZE
16 DON'T CARE + BFA7-BFA0
X
X···X, BFA8
BFA7-0
Completes writing into the buffer
n
n+1
Last Byte
22.2 Buffer to Main Memory Page Program (Data from Buffer Programmed into Flash Page)
Starts self-timed erase/program operation
CS
SI (INPUT)
Each transition
represents 8 bits
CMD
BINARY PAGE SIZE
A17-A8 + 8 DON'T CARE BITS
PA9-7
PA6-0, X
XXXX XX
n = 1st byte read
n+1 = 2nd byte read
40 AT45DB021D
3638I–DFLASH–04/09