AT45DB321 ATMEL Corporation, AT45DB321 Datasheet - Page 12

• Manufacturer Part Number: AT45DB321
• Description: 32-Megabit 2.7-volt Only Serial DataFlash
• Manufacturer: ATMEL Corporation

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
12
CS
SO
SI
Each transition represents
8 bits and 8 clock cycles
CMD
SO
CS
SI
AT45DB321
PAGE (528 BYTES)
MAIN MEMORY
r , PA12-6
SO
CS
BUFFER 1 (528 BYTES)
SI
BUFFER 1
BUFFER 1
PAGE TO
READ
CMD
PA5-0, BA9-8
CMD
X
FLASH MEMORY ARRAY
BA7-0
X···X, BFA9-8
r , PA12-6
I/O INTERFACE
SO
X
MAIN MEMORY
PAGE READ
Starts reading page data into buffer
BFA7-0
PA5-0, XX
BUFFER 2 (528 BYTES)
X
X
X
X
MAIN MEMORY
PAGE TO
BUFFER 2
BUFFER 2
READ
n
n+1
X
n = 1st byte read
n+1 = 2nd byte read
n
n+1