AT45DB321

12

Read Operations

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

Main Memory Page Read

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

Buffer Read

FLASH MEMORY ARRAY

PAGE (528 BYTES)

BUFFER 2 (528 BYTES)

BUFFER 1 (528 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

SI

CMD

PA5-0, BA9-8

BA7-0

X

X

X

X

CS

n

n+1

SO

r , PA12-6

SI

CMD

PA5-0, XX

X

Starts reading page data into buffer

CS

SO

r , PA12-6

SI

CMD

X

X···X, BFA9-8

BFA7-0

CS

n

n+1

SO

X

n = 1st byte read

n+1 = 2nd byte read

Each transition represents

8 bits and 8 clock cycles