Rainbow Electronics AT45DB321B - Manual (Page 16)

16
AT45DB321B
2223D–DFLASH–10/02
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 (528 BYTES)
BUFFER 2 (528 BYTES) BUFFER 1 (528 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
SI CMD n n+1 Last Byte
· Completes writing into selected buffer
· Starts self-timed erase/program operation
CS
r , PA12-6 PA5-0, BFA9-8 BFA7-0
SI CMD X X···X, BFA9-8 BFA7-0 n n+1 Last Byte
· Completes writing into selected buffer
CS
SI CMD PA5-0, XX X
CS
Starts self-timed erase/program operation
r , PA12-6
Each transition represents
8 bits and 8 clock cycles
n = 1st byte read
n+1 = 2nd byte read