at45db041b ATMEL Corporation, at45db041b Datasheet - Page 18

• Manufacturer Part Number: at45db041b
• Description: At45db041b 4-megabit 2.5-volt Or 2.7-volt Dataflash
• Manufacturer: ATMEL Corporation

13. Read Operations
13.1
13.2
13.3
18
Each transition represents
8 bits and 8 clock cycles
SO
CS
SI
Main Memory Page Read
Main Memory Page to Buffer Transfer (Data from Flash Page Read into Buffer)
Buffer Read
AT45DB041B
CMD
SO
CS
SI
MAIN MEMORY
PAGE (264 BYTES)
The following block diagram and waveforms illustrate the various read sequences available.
BUFFER 1 (264 BYTES)
r r r r, PA10-7
BUFFER 1
BUFFER 1
PAGE TO
SO
CS
SI
READ
CMD
PA6-0, BA8
CMD
X
FLASH MEMORY ARRAY
BA7-0
X···X, BFA8
I/O INTERFACE
r r r r, PA10-7
SO
MAIN MEMORY
PAGE READ
X
Starts reading page data into buffer
BFA7-0
PA6-0, X
BUFFER 2 (264 BYTES)
X
X
X
X
n
MAIN MEMORY
PAGE TO
BUFFER 2
BUFFER 2
READ
n+1
X
n = 1st byte read
n+1 = 2nd byte read
n
3443D–DFLSH–2/08
n+1