User Manual

17
AT45DB161B
2224E–DFLSH–10/02
Read Operations The following block diagram and waveforms illustrate the various read sequences
available.
Main Memory P age Read
Main Memory Page to Buffer Transfer (Dat a from Flash Page Read into Buffer)
Buffer Read
FLASH MEMORY ARRAY
PAGE (528 BYTES)
BUFFER 2 (528 BYTES)BUFFER 1 (528 BYTES)
I/O INTERFACE
MAIN MEMORY
PAGE TO
BUFFER 1
MAIN MEMORY
PAGE TO
BUFFER 2
MAIN MEMORY
PAGE READ
BUFFER 1
READ
BUFFER 2
READ
SO
SI
CMD
PA5-0, BA9-8
BA7-0 X
XXX
CS
n n+1
SO
r r , PA11-6
SI
CMD
PA5-0, XX X
Starts reading page data into buffer
CS
SO
r r , PA11-6
SI
CMD
X
X···X, BFA9-8
BFA7-0
CS
n n+1
SO
X
Each transition represents
8 bits and 8 clock c
y
cles
n = 1st byte read
n+1 = 2nd byte read