at45db041d-su-sl955 ATMEL Corporation, at45db041d-su-sl955 Datasheet - Page 39

• Manufacturer Part Number: at45db041d-su-sl955
• Description: At45db041d 4-megabit 2.5-volt Or 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
3595L–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 PROGRAM
BUFFER 1 (256/264 BYTES)
Each transition
MAIN MEMORY
PAGE (256/264 BYTES)
BUFFER 1 TO
CMD
BUFFER 1
WRITE
X
16 DON'T CARE + BFA7-BFA0
CMD
BINARY PAGE SIZE
X···X, BFA8
FLASH MEMORY ARRAY
I/O INTERFACE
PA10-7
Starts self-timed erase/program operation
BFA7-0
SI
A18-A8 + 8 DON'T CARE BITS
BINARY PAGE SIZE
BUFFER 2 (256/264 BYTES)
n
PA6-0, X
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
AT45DB041D
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