at45db021b ATMEL Corporation, at45db021b Datasheet - Page 17

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at45db021b

Manufacturer Part Number
at45db021b
Description
At45db021b 2-megabit 2.7-volt Only Dataflash
Manufacturer
ATMEL Corporation
Datasheet

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10. Write Operations
10.1
10.2
10.3
1937J–DFLSH–9/05
Each transition represents
8 bits and 8 clock cycles
Main Memory Page Program through Buffers
Buffer Write
Buffer to Main Memory Page Program (Data from Buffer Programmed into Flash Page)
CS
SI
CS
SI
CMD
The following block diagram and waveforms illustrate the various write sequences available.
CMD
CS
SI
r r r r r, PA9-7
PAGE PROGRAM
PAGE (256 BYTES)
BUFFER 1 (256 BYTES)
BUFFER 1 TO
BUFFER 1
X
WRITE
PA6-0, BFA8
CMD
X···X, BFA8
r r r r r, PA9-7
BFA7-0
BFA7-0
FLASH MEMORY ARRAY
Starts self-timed erase/program operation
PAGE PROGRAM
THROUGH BUFFER 1
PA6-0, X
I/O INTERFACE
n
THROUGH BUFFER 2
n
PAGE PROGRAM
SI
n+1
· Completes writing into selected buffer
X
n+1
· Completes writing into selected buffer
· Starts self-timed erase/program operation
BUFFER 2 (256 BYTES)
Last Byte
Last Byte
AT45DB021B
n = 1st byte read
n+1 = 2nd byte read
BUFFER 2 TO
PAGE PROGRAM
BUFFER 2
WRITE
17

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