Read operations – Rainbow Electronics AT45DB321D User Manual

Page 40

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3597J–DFLASH–4/08

AT45DB321D

23. Read Operations

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

23.1

Main Memory Page Read

23.2

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

FLASH MEMORY ARRAY

PAGE (512/528 BYTES)

BUFFER 2 (512/528 BYTES)

BUFFER 1 (512/528 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 (INPUT)

CMD

PA12-6

PA5-0, BA9-8

X

CS

n

n+1

SO (OUTPUT)

BA7-0

4 Dummy Bytes

X

ADDRESS FOR BINARY PAGE SIZE

A21-A16

A15-A8

A7-A0

Starts reading page data into buffer

SI (INPUT)

CMD

PA12-6

PA5-0, XX

CS

SO (OUTPUT)

XXXX XXXX

BINARY PAGE SIZE

A21-A9 + 9 DON'T CARE BITS

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