AT45D041

8

Main Memory Page Program through Buffers

SI

CMD

n

n+1

Last Byte

· Completes writing into selected buffer

· Starts self-timed erase/program operation

CS

r r r r, PA10-7

PA6-0, BFA8

BFA7-0

Buffer Write

SI

CMD

X

X···X, BFA8

BFA7-0

n

n+1

Last Byte

· Completes writing into selected buffer

CS

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

SI

CMD

r r r r, PA10-7

PA6-0, X

CS

Starts self-timed erase/program operation

Each transition represents

8 bits and 8 clock cycles

Write Operations

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

FLASH MEMORY ARRAY

PAGE (264 BYTES)

BUFFER 2 (264 BYTES)

BUFFER 1 (264 BYTES)

I/O INTERFACE

SI

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

BUFFER 1

WRITE

BUFFER 2

WRITE

n = 1st byte written

n+1 = 2nd byte written