AT45DB321 ATMEL Corporation, AT45DB321 Datasheet - Page 11

• Manufacturer Part Number: AT45DB321
• Description: 32-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 Buffers
Buffer Write
Buffer to Main Memory Page Program
(Data from Buffer Programmed into Flash Page)
CS
SI
Each transition represents
8 bits and 8 clock cycles
CS
SI
CMD
CMD
CS
PAGE PROGRAM
SI
MAIN MEMORY
PAGE (528 BYTES)
BUFFER 1 (528 BYTES)
BUFFER 1 TO
r , PA12-6
BUFFER 1
WRITE
X
PA5-0, BFA9-8
X···X, BFA9-8
CMD
FLASH MEMORY ARRAY
MAIN MEMORY PAGE
PROGRAM THROUGH
BUFFER 1
r , PA12-6
I/O INTERFACE
BFA7-0
BFA7-0
THROUGH BUFFER 2
PAGE PROGRAM
MAIN MEMORY
SI
Starts self-timed erase/program operation
PA5-0, XX
n
n
BUFFER 2 (528 BYTES)
n+1
· Completes writing into selected buffer
n+1
X
· Completes writing into selected buffer
· Starts self-timed erase/program operation
BUFFER 2 TO
MAIN MEMORY
PAGE PROGRAM
BUFFER 2
WRITE
n = 1st byte written
n+1 = 2nd byte written
Last Byte
Last Byte
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