AT45DB080

9

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

I/O7-I/O0 (INPUT)

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

I/O7-I/O0

(INPUT)

CMD

n

n+1

Last Byte

· Completes writing into selected buffer

· Starts self-timed erase/program operation

CS

r r r, PA11-7

PA6-0, BFA8

BFA7-0

ADDR

ADDR

ADDR

I/O7-I/O0

(INPUT)

CMD

X

X···X, BFA8

BFA7-0

n

n+1

Last Byte

· Completes writing into selected buffer

CS

ADDR

ADDR

ADDR

I/O7-I/O0

(INPUT)

CMD

PA6-0, X

CS

Starts self-timed erase/program operation

r r r, PA11-7

X

ADDR

ADDR

ADDR

Each transition represents

8 bits and 1 clock cycle

n = 1st byte written

n+1 = 2nd byte written