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GD25B64C Datasheet(PDF) 19 Page - GigaDevice Semiconductor (Beijing) Inc.

Part # GD25B64C
Description  3.3V Uniform Sector Dual and Quad Serial Flash
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Manufacturer  GIGADEVICE [GigaDevice Semiconductor (Beijing) Inc.]
Direct Link  http://www.gigadevice.com/
Logo GIGADEVICE - GigaDevice Semiconductor (Beijing) Inc.

GD25B64C Datasheet(HTML) 19 Page - GigaDevice Semiconductor (Beijing) Inc.

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3.3V Uniform Sector
Dual and Quad Serial Flash
GD25B64C
19
7.7.
Read Data Bytes at Higher Speed (Fast Read) (0BH)
The Read Data Bytes at Higher Speed (Fast Read) command is for quickly reading data out. It is followed by a 3-byte
address (A23-A0) and a dummy byte, each bit being latched-in during the rising edge of SCLK. Then the memory content,
at that address, is shifted out on SO, each bit being shifted out, at a Max frequency fC, during the falling edge of SCLK. 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 7. Read Data Bytes at Higher Speed Sequence Diagram
7.8. Dual Output Fast Read (3BH)
The Dual Output Fast Read command is followed by 3-byte address (A23-A0) and a dummy byte, each bit being
latched in during the rising edge of SCLK, then the memory contents are shifted out 2-bit per clock cycle from SI and SO.
The command sequence is shown in followed Figure 8. 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 8. Dual Output Fast Read Sequence Diagram
Command
0
1
2
3
4
5
6
7
0BH
CS#
SCLK
SI
SO
High-Z
8
9 10
28 29 30 31
3
2
1
0
23 22 21
24-bit address
MSB
34 35 36 37
33
6
5
4
3
2
1
0
38 39
Data Out1
32
42 43 44 45
41
46 47
40
7
6
5
4
3
2
1
0
7
6
5
7
Data Out2
CS#
SCLK
SI
SO
MSB
Dummy Byte
Command
0
1
2
3
4
5
6
7
3BH
CS#
SCLK
SI
SO
High-Z
8
9 10
28 29 30 31
3
2
1
0
23 22 21
24-bit address
MSB
34 35 36 37
33
5
3
1
7
5
3
1
38 39
Data Out1
32
42 43 44 45
41
46 47
40
7
Data Out2
CS#
SCLK
SI
SO
MSB
Dummy Clocks
4
2
0
6
4
2
0
6
6
7


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