AT45DB021B datasheet(17/32 Pages) ATMEL

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1937J–DFLSH–9/05

AT45DB021B

10. Write Operations

The following block diagram and waveforms illustrate the various write sequences available.

10.1

Main Memory Page Program through Buffers

10.2

Buffer Write

10.3

Buffer to Main Memory Page Program (Data from Buffer Programmed into Flash Page)

FLASH MEMORY ARRAY

PAGE (256 BYTES)

BUFFER 2 (256 BYTES)

BUFFER 1 (256 BYTES)

I/O INTERFACE

BUFFER 1 TO

PAGE PROGRAM

THROUGH BUFFER 2

BUFFER 2 TO

PAGE PROGRAM

THROUGH BUFFER 1

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

AT45DB021B Datenblatt(PDF) 17 Page - ATMEL Corporation

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