Write operations, Cs si, Cs i/o – Rainbow Electronics AT45DQ321 User 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)