Owner's manual

16
AT45DB021B
1937F–DFLSH–10/02
Write Operations The following block diagram and waveforms illustrate the various write sequences
available.
Main Memory Page Program through Buffers
Buffer Write
Buffer to Main Memory Page Program (Data from Buffer Programmed into Flash Page)
FLASH MEMORY ARRAY
PAGE (264 BYTES)
BUFFER 2 (264 BYTES)BUFFER 1 (264 BYTES)
I/O INTERFACE
SI
BUFFER 1 TO
MAIN MEMORY
PAGE PROGRAM
MAIN MEMORY
PAGE PROGRAM
THROUGH BUFFER 2
BUFFER 2 TO
MAIN MEMORY
PAGE PROGRAM
MAIN MEMORY PAGE
PROGRAM THROUGH
BUFFER 1
BUFFER 1
WRITE
BUFFER 2
WRITE
SI
CMD n n+1 Last Byte
· Completes writing into selected buffer
· Starts self-timed erase/program operation
CS
rrrr r, PA9-7 PA6-0, BFA8 BFA7-0
SI
CMD X
X···X, BFA8
BFA7-0
n
n+1
Last Byte
· Completes writing into selected buffer
CS
SI
CMD rrrr r, PA9-7 PA6-0, X
CS
Starts self-timed erase/program operation
X
Each transition represents
8 bits and 8 clock c
y
cles
n = 1st byte read
n+1 = 2nd byte read