Write operations, Buffer write, Each transition represents 8 bits – Rainbow Electronics AT45DB642 User Manual
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AT45DB642
1638F–DFLSH–09/02
Write Operations
The following block diagram and waveforms illustrate the various write sequences available.
Main Memory Page Program through Buffers
Buffer Write
Buffer to Main Memory Page Program (Data from Buffer Programmed into Flash Page)
FLASH MEMORY ARRAY
PAGE (1056 BYTES)
BUFFER 2 (1056 BYTES)
BUFFER 1 (1056 BYTES)
I/O INTERFACE
SI
BUFFER 1 TO
MAIN MEMORY
PAGE PROGRAM
MAIN MEMORY
PAGE PROGRAM
THROUGH BUFFER 2
BUFFER 2 TO
MAIN MEMORY
PAGE PROGRAM
MAIN MEMORY PAGE
PROGRAM THROUGH
BUFFER 1
BUFFER 1
WRITE
BUFFER 2
WRITE
I/O7 - I/O0
SI or I/O7 - I/O0
(INPUT)
CMD
n
n+1
Last Byte
· Completes writing into selected buffer
· Starts self-timed erase/program operation
CS
PA12-5
PA4-0, BFA10-8
BFA7-0
SI or I/O7 - I/O0
(INPUT)
CMD
X
X···X, BFA10-8
BFA7-0
n
n+1
Last Byte
· Completes writing into selected buffer
CS
SI or I/O7 - I/O0
(INPUT)
CMD
PA12-5
PA4-0, XXX
CS
Starts self-timed erase/program operation
X···X
Each transition
represents 8 bits
n = 1st byte read
n+1 = 2nd byte read