at45db041d-su-sl955 ATMEL Corporation, at45db041d-su-sl955 Datasheet - Page 40

• Manufacturer Part Number: at45db041d-su-sl955
• Description: At45db041d 4-megabit 2.5-volt Or 2.7-volt Dataflash
• Manufacturer: ATMEL Corporation

23. Read Operations
The following block diagram and waveforms illustrate the various read sequences available.
23.1
23.2
40
SO (OUTPUT)
Main Memory Page Read
Main Memory Page to Buffer Transfer (Data from Flash Page Read into Buffer)
SI (INPUT)
AT45DB041D
SO (OUTPUT)
SI (INPUT)
CS
CS
MAIN MEMORY
PAGE (256/264 BYTES)
BUFFER 1 (256/264 BYTES)
BUFFER 1
BUFFER 1
PAGE TO
CMD
READ
ADDRESS FOR BINARY PAGE SIZE
CMD
A18-A16
PA10-7
FLASH MEMORY ARRAY
PA6-0, BA8
A15-A8
I/O INTERFACE
PA10-7
SO
A7-A0
BA7-0
MAIN MEMORY
PAGE READ
A18-A8 + 8 DON'T CARE BITS
BINARY PAGE SIZE
BUFFER 2 (256/264 BYTES)
X
4 Dummy Bytes
PA6-0, X
Starts reading page data into buffer
MAIN MEMORY
PAGE TO
BUFFER 2
BUFFER 2
READ
X
XXXX XXXX
n
n+1
3595L–DFLASH–4/08