AT45DB ATMEL Corporation, AT45DB Datasheet - Page 10

• Manufacturer Part Number: AT45DB
• Description: 1-Megabit 2.7-volt Only Serial DataFlash
• Manufacturer: ATMEL Corporation

Write Operations
The following block diagram and waveforms illustrate the various write sequences available.
Main Memory Page Program through Buffer
Buffer Write
Buffer to Main Memory Page Program
(Data from Buffer Programmed into Flash Page)
10
CS
SI
Each transition represents
8 bits and 8 clock cycles
CS
SI
CMD
PAGE (264 BYTES)
AT45DB011
CMD
CS
SI
r ···r , PA8-7
X
PA6-0, BFA8
X···X, BFA8
CMD
PAGE PROGRAM
MAIN MEMORY
BUFFER (264 BYTES)
FLASH MEMORY ARRAY
BUFFER TO
BUFFER
r ···r , PA8-7
I/O INTERFACE
WRITE
BFA7-0
BFA7-0
SI
Starts self-timed erase/program operation
PA6-0, X
n
n
MAIN MEMORY PAGE
PROGRAM THROUGH
BUFFER
n+1
· Completes writing into buffer
n+1
X
· Completes writing into buffer
· Starts self-timed erase/program operation
Last Byte
n = 1st byte written
n+1 = 2nd byte written
Last Byte