AT45DB321C datasheet(23/37 Pages) ATMEL

23 / 37 page

AT45DB321C [Preliminary]

3387B–DFLSH–9/04

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 (528 BYTES)

BUFFER 2 (528 BYTES)

BUFFER 1 (528 BYTES)

I/O INTERFACE

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

WRITE

BUFFER 2

WRITE

CMD

n+1

Last Byte

· Completes writing into selected buffer

· Starts self-timed erase/program operation

r, PA12-6

PA5-0, BFA9-8

BFA7-0

CMD

X···X, BFA9-8

BFA7-0

n+1

Last Byte

· Completes writing into selected buffer

CMD

PA5-0, XX

Starts self-timed erase/program operation

r , PA12-6

Each transition represents

8 bits and 8 clock cycles

n = 1st byte write

n+1 = 2nd byte write

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