AT45DB021D 데이터 시트보기 (PDF) - Atmel Corporation

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AT45DB021D

2-megabit 2.7-volt Minimum DataFlash®

Atmel Corporation 

AT45DB021D

23. Read Operations

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

FLASH MEMORY ARRAY

PAGE (256/264 BYTES)

MAIN MEMORY

PAGE TO

BUFFER

BUFFER (256/264 BYTES)

BUFFER

READ

MAIN MEMORY

PAGE READ

I/O INTERFACE

SO

23.1 Main Memory Page Read

CS

ADDRESS FOR BINARY PAGE SIZE

A17-A16

A15-A8

A7-A0

SI (INPUT)

CMD

PA9-7

PA6-0, BA8

BA7-0

X

X

SO (OUTPUT)

4 Dummy Bytes

n

n+1

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

Starts reading page data into buffer

CS

SI (INPUT)

BINARY PAGE SIZE

6 DON’T CARE BITS + A17-A8 + 8 DON'T CARE BITS

CMD

X···X, PA9-7

PA6-0, X

XXXX XXXX

SO (OUTPUT)

41

3638I–DFLASH–04/09

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