AT45D041

9

Read Operations

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

FLASH MEMORY ARRAY

PAGE (264 BYTES)

BUFFER 2 (264 BYTES)

BUFFER 1 (264 BYTES)

I/O INTERFACE

MAIN MEMORY

PAGE TO

BUFFER 1

MAIN MEMORY

PAGE TO

BUFFER 2

MAIN MEMORY

PAGE READ

BUFFER 1

READ

BUFFER 2

READ

SO

Main Memory Page Read

SI

CMD

r r r r, PA10-7

PA6-0, BA8

BA7-0

X

X

X

X

CS

n

n+1

SO

Main Memory Page to Buffer Transfer (Data from Flash Page Read into Buffer)

SI

CMD

r r r r, PA10-7

PA6-0, X

X

Starts reading page data into buffer

CS

SO

Buffer Read

SI

CMD

X

X···X, BFA8

BFA7-0

CS

n

n+1

SO

X

Each transition represents

8 bits and 8 clock cycles

n = 1st byte read

n+1 = 2nd byte read