Owner's manual

54
AT45DB321E [PRELIMINARY DATASHEET]
8784B–DFLASH–11/2012
23. Write Operations
The following block diagram and waveforms illustrate the various write sequences available.
Figure 23-1. Block Diagram
Figure 23-2. Buffer Write
Figure 23-3. Buffer to Main Memory Page Program
Flash Memory Array
Buffer 2 (512/528 bytes)
I/O Interface
SI
Buffer 1 To
Main Memory
Page Program
Buffer 2 To
Main Memory
Page Program
Buffer 1
Write
Buffer 2
Write
Page (512/528 bytes)
Buffer 1 (512/528 bytes)
CS
SI (Input)
CMD X X···X, BFA9-8 BFA7-0 n n + 1 Last Byte
Completes Writing into Selected Buffer
Binary Page Size
15 Dummy Bits + BFA8-BFA0
CS
SI (Input)
CMD XX, PA12-6 PA5-0, XX XXXX XX
Starts Self-timed Erase/Program Operation
Binary Page Size
A21-A9 + 11 Dummy Bits
n = 1st byte read
n+1 = 2nd byte read
Each transition represents eight bits