AT45DB021B datasheet(16/33 Pages) ATMEL

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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

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

rrrr r, PA9-7

PA6-0, BFA8

BFA7-0

CMD

X···X, BFA8

BFA7-0

n+1

Last Byte

· Completes writing into selected buffer

CMD

rrrr r, PA9-7

PA6-0, X

Starts self-timed erase/program operation

Each transition represents

8 bits and 8 clock cycles

n = 1st byte read

n+1 = 2nd byte read

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