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GD25LB32D Scheda tecnica(PDF) 23 Page - GigaDevice Semiconductor (Beijing) Inc.

Il numero della parte GD25LB32D
Spiegazioni elettronici  1.8V Uniform Sector Dual and Quad Serial Flash
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Produttore elettronici  GIGADEVICE [GigaDevice Semiconductor (Beijing) Inc.]
Homepage  http://www.gigadevice.com/
Logo GIGADEVICE - GigaDevice Semiconductor (Beijing) Inc.

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1.8V Uniform Sector
Dual and Quad Serial Flash
GD25LB32D
23
7.8. Fast Read (0BH) in QPI mode
The Fast Read command is also supported in QPI mode. In QPI mode, the number of dummy clocks is configured
by the
“Set Read Parameters (C0H)” command to accommodate a wide range application with different needs for
either maximum Fast Read frequency or minimum data access latency. Depending on the Read Parameter Bits
P[5:4] setting, the number of dummy clocks can be configured as either 4/6/8.
Figure8a. Read Data Bytes at Higher Speed Sequence Diagram (QPI)
CS#
SCLK
IO0
IO1
IO2
IO3
0
1
2
3
4
5
Command
0BH
20
12
16
8
6
7
8
9
10
4
4
0
0
4
0
4
0
4
21
13
17
9
5
5
1
1
5
1
5
1
5
22
14
18
10
6
6
2
2
6
2
6
2
6
23
15
19
11
7
7
3
3
7
3
7
3
7
A23-16 A15-8
A7-0
Dummy*
11
12 13
IOs switch from
Input to output
Byte1
*"Set Read Parameters" Command (C0H)
can set the number of dummy clocks
Dummy*
7.9. Dual Output Fast Read (3BH)
The Dual Output Fast Read command is followed by 3-byte address (A23-A0) and a dummy byte, and each bit is
latched in on 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 Figure9. 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.
Figure9. Dual Output Fast Read Sequence Diagram
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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