AT45DB080

10

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 (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

I/O7-I/O0 (OUTPUT)

I/O7-I/O0

(INPUT)

CMD

PA6-0, BA8

BA7-0

X

X

X

X

CS

n

n+1

I/O7-I/O0

(OUTPUT)

r r r, PA11-7

ADDR

ADDR

ADDR

I/O7-I/O0

(INPUT)

CMD

PA6-0, X

X

Starts reading page data into buffer

CS

I/O7-I/O0

(OUTPUT)

r r r, PA11-7

ADDR

ADDR

ADDR

I/O7-I/O0

(INPUT)

CMD

X

X···X, BFA8

BFA7-0

CS

n

n+1

I/O7-I/O0

(OUTPUT)

X

ADDR

ADDR

ADDR

Each transition represents

8 bits and 1 clock cycle

n = 1st byte written

n+1 = 2nd byte written