at45db321b-c ATMEL Corporation, at45db321b-c Datasheet - Page 16

• Manufacturer Part Number: at45db321b-c
• Description: At45db321b 32-megabit 2.7-volt Only Dataflash
• Manufacturer: ATMEL Corporation

Write Operations
Main Memory Page Program through Buffers
Buffer Write
Buffer to Main Memory Page Program (Data from Buffer Programmed into Flash Page)
Each transition represents
16
8 bits and 8 clock cycles
CS
SI
AT45DB321B
CS
SI
PAGE PROGRAM
MAIN MEMORY
PAGE (528 BYTES)
BUFFER 1 (528 BYTES)
CMD
BUFFER 1 TO
BUFFER 1
CMD
CS
SI
WRITE
r , PA12-6
The following block diagram and waveforms illustrate the various write sequences
available.
X
PA5-0, BFA9-8
X···X, BFA9-8
CMD
FLASH MEMORY ARRAY
MAIN MEMORY PAGE
PROGRAM THROUGH
BUFFER 1
I/O INTERFACE
r , PA12-6
THROUGH BUFFER 2
BFA7-0
BFA7-0
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
X
n+1
· Completes writing into selected buffer
· Starts self-timed erase/program operation
BUFFER 2 TO
MAIN MEMORY
PAGE PROGRAM
BUFFER 2
WRITE
Last Byte
Last Byte
n = 1st byte read
n+1 = 2nd byte read
2223E–DFLASH–11//03