at45db321c ATMEL Corporation, at45db321c Datasheet - Page 27

• Manufacturer Part Number: at45db321c
• Description: 32-megabit 2.7 Volt Dataflash At45db321c For New Designs Use At45db321d
• Manufacturer: ATMEL Corporation

15. Read Operations
15.1
15.2
15.3
3387M–DFLASH–2/08
SO
Each transition represents
CS
SI
8 bits and 8 clock cycles
Main Memory Page Read
Main Memory Page to Buffer Transfer (Data from Flash Page Read into Buffer)
Buffer Read
SO
CS
SI
CMD
SO
CS
SI
MAIN MEMORY
PAGE (528 BYTES)
BUFFER 1 (528 BYTES)
The following block diagram and waveforms illustrate the various read sequences available.
BUFFER 1
BUFFER 1
r , PA12-6
PAGE TO
CMD
READ
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
AT45DB321C
n+1
n
n+1
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