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Giải thích chi tiết về linh kiện  3.3V Uniform Sector Dual and Quad Serial Flash
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3.3V Uniform Sector
Dual and Quad Serial Flash
GD25B256D
29
7.11.
Quad Output Fast Read (QOFR 6BH or 4QOFR 6CH)
The Quad Output Fast Read command is followed by 3-Byte address (A23-A0) and a dummy Byte, and each bit being
latched in on the rising edge of SCLK, then the memory contents are shifted out 4-bit per clock cycle from IO3, IO2, IO1
and IO0. The command sequence is shown in followed Figure19. The first Byte addressed can be at any location. The
address is automatically incremented to the next higher address after each Byte of data is shifted out.
Figure 19 Quad Output Fast Read Sequence Diagram (ADS=0)
Note:
1. The dummy clock number is configurable.
Command
0
1
2
3
4
5
6
7
6BH
CS#
SCLK
SI(IO0)
SO(IO1)
High-Z
8
9 10
28 29 30 31
3
2
1
0
23 22 21
24-bit address
34 35 36 37
33
1
5
1
5
1
5
1
38 39
Byte1
32
42 43 44 45
41
46 47
40
5
Dummy Clocks
0
4
0
4
0
4
0
4
4
5
IO2
High-Z
IO3
High-Z
CS#
SCLK
SI(IO0)
SO(IO1)
IO2
IO3
2
6
2
6
2
6
2
6
6
3
7
3
7
3
7
3
7
7
Byte2 Byte3 Byte4



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