AT45DB321C-RI ATMEL [ATMEL Corporation], AT45DB321C-RI Datasheet - Page 24

• Manufacturer Part Number: AT45DB321C-RI
• Description: 32 MEGABIT 2.7 VOLT DATAFLASH
• Manufacturer: ATMEL [ATMEL Corporation]

Read Operations
Main Memory Page Read
Main Memory Page to Buffer Transfer (Data from Flash Page Read into Buffer)
Buffer Read
24
SO
CS
Each transition represents
SI
8 bits and 8 clock cycles
AT45DB321C [Preliminary]
CS
SO
SI
CMD
SO
CS
SI
MAIN MEMORY
PAGE (528 BYTES)
BUFFER 1 (528 BYTES)
BUFFER 1
BUFFER 1
r , PA12-6
PAGE TO
CMD
READ
The following block diagram and waveforms illustrate the various read sequences
available.
PA5-0, BA9-8
CMD
X
FLASH MEMORY ARRAY
X···X, BFA9-8
BA7-0
r , PA12-6
I/O INTERFACE
SO
MAIN MEMORY
PAGE READ
X
Starts reading page data into buffer
BFA7-0
PA5-0, XX
X
BUFFER 2 (528 BYTES)
X
X
X
MAIN MEMORY
PAGE TO
BUFFER 2
BUFFER 2
READ
n
n = 1st byte read
n+1 = 2nd byte read
X
n+1
n
3387B–DFLSH–9/04
n+1