at45db021d-ssh-sl955 ATMEL Corporation, at45db021d-ssh-sl955 Datasheet - Page 39

• Manufacturer Part Number: at45db021d-ssh-sl955
• Description: 2-megabit 2.7-volt Minimum Dataflash
• Manufacturer: ATMEL Corporation

22. Write Operations
The following block diagram and waveforms illustrate the various write sequences available.
22.1
22.2
3638F–DFLASH–4/08
SI (INPUT)
Buffer Write
Buffer to Main Memory Page Program (Data from Buffer Programmed into Flash Page)
CS
SI (INPUT)
CS
represents 8 bits
PAGE (256/264 BYTES)
Each transition
CMD
X
16 DON'T CARE + BFA7-BFA0
CMD
BINARY PAGE SIZE
PAGE PROGRAM
X···X, BFA8
BUFFER (256/264 BYTES)
MAIN MEMORY
FLASH MEMORY ARRAY
BUFFER TO
BUFFER
I/O INTERFACE
WRITE
PA9-7
Starts self-timed erase/program operation
BFA7-0
SI
A17-A8 + 8 DON'T CARE BITS
BINARY PAGE SIZE
n
PA6-0, X
Completes writing into the buffer
n+1
XXXX XX
n = 1st byte read
n+1 = 2nd byte read
Last Byte
AT45DB021D
39