AT45D081 ATMEL Corporation, AT45D081 Datasheet - Page 8

• Manufacturer Part Number: AT45D081
• Description: 8-Megabit 5-volt Only Serial DataFlash
• Manufacturer: ATMEL Corporation

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)
8
CS
Each transition represents
SI
8 bits and 8 clock cycles
CS
SI
CMD
PAGE PROGRAM
MAIN MEMORY
PAGE (264 BYTES)
BUFFER 1 (264 BYTES)
BUFFER 1 TO
CMD
AT45D081
CS
SI
BUFFER 1
WRITE
r r r, PA11-7
X
PA6-0, BFA8
X···X, BFA8
CMD
FLASH MEMORY ARRAY
MAIN MEMORY PAGE
PROGRAM THROUGH
BUFFER 1
r r r, PA11-7
I/O INTERFACE
THROUGH BUFFER 2
BFA7-0
BFA7-0
PAGE PROGRAM
MAIN MEMORY
SI
Starts self-timed erase/program operation
PA6-0, X
n
n
BUFFER 2 (264 BYTES)
n+1
· Completes writing into selected buffer
n+1
· Completes writing into selected buffer
· Starts self-timed erase/program operation
BUFFER 2 TO
MAIN MEMORY
PAGE PROGRAM
BUFFER 2
WRITE
Last Byte
n+1 = 2nd byte written
Last Byte
n = 1st byte written