Rainbow Electronics AT45DQ321 - Manual (Page 62)

62 AT45DQ321 [ADVANCE DATASHEET]
DS-45DQ321-031–DFLASH–12/2012
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. Dual-input Buffer Write
Flash Memory Array
Buffer 2 (512/528 bytes)
I/O Interface
SI (I/O
0
)
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 CMD X···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
n = 1st byte read
n+1 = 2nd byte read
Each transition represents eight bits
SCK
MSB MSB
2 3 1 0
0 0 1 0 0 1 0 0
6 7 5 4 10 11 9 8 12 39 37 38 33 36 35 34 31 32 29 30
Opcode
A A A A A A A A A
MSB MSB
D7
D6
D5
D4
D3
D2
D1
D0
D7
D6
D5
D4
D3
D2
D1
D0
Address Bits A23-A0
Input
Data Byte 1
MSB
D7
D6
D5
D4
D3
D2
D1
D0
Input
Data Byte n
Input
Data Byte 2
High-impedance
CS
I/O
1
(SO)
I/O
0
(SI)