at45db321b-c ATMEL Corporation, at45db321b-c Datasheet - Page 17

• Manufacturer Part Number: at45db321b-c
• Description: At45db321b 32-megabit 2.7-volt Only Dataflash
• Manufacturer: ATMEL Corporation

Each transition represents
Read Operations
Main Memory Page Read
Main Memory Page to Buffer Transfer (Data from Flash Page Read into Buffer)
Buffer Read
2223E–DFLASH–11//03
8 bits and 8 clock cycles
CS
SO
SI
CMD
SO
CS
SI
MAIN MEMORY
PAGE (528 BYTES)
BUFFER 1 (528 BYTES)
r , PA12-6
BUFFER 1
BUFFER 1
SO
CS
PAGE TO
SI
READ
The following block diagram and waveforms illustrate the various read sequences
available.
CMD
PA5-0, BA9-8
CMD
X
FLASH MEMORY ARRAY
BA7-0
X···X, BFA9-8
I/O INTERFACE
r , PA12-6
SO
X
MAIN MEMORY
PAGE READ
Starts reading page data into buffer
BFA7-0
PA5-0, XX
X
BUFFER 2 (528 BYTES)
X
X
X
n
MAIN MEMORY
PAGE TO
BUFFER 2
BUFFER 2
READ
n+1
X
AT45DB321B
n = 1st byte read
n+1 = 2nd byte read
n
n+1
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