AT45(1997) データシートの表示（PDF） - Atmel Corporation

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AT45
(Rev.:1997)

4-Megabit 5-volt Only Serial DataFlash™

Atmel Corporation 

Write Operations

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

FLASH MEMORY ARRAY

PAGE (264 BYTES)

BUFFER 1 TO

MAIN MEMORY

PAGE PROGRAM

BUFFER 1 (264 BYTES)

BUFFER 1

WRITE

MAIN MEMORY

PAGE PROGRAM

THROUGH BUFFER 2

MAIN MEMORY PAGE

PROGRAM THROUGH

BUFFER 1

I/O INTERFACE

BUFFER 2 TO

MAIN MEMORY

PAGE PROGRAM

BUFFER 2 (264 BYTES)

BUFFER 2

WRITE

SI

Main Memory Page Program through Buffers

CS

SI

CMD

r r r r, PA10-7 PA6-0, BFA8

BFA7-0

n

· Completes writing into selected buffer

· Starts self-timed erase/program operation

n+1

Last Byte

Buffer Write

CS

SI

CMD

X

X···X, BFA8 BFA7-0

n

· Completes writing into selected buffer

n+1

Last Byte

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

Starts self-timed erase/program operation

CS

SI

CMD

r r r r, PA10-7 PA6-0, X

Each transition represents

8 bits and 8 clock cycles

8

AT45D041

n = 1st byte written

n+1 = 2nd byte written

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