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GD25LB128DSJS データシート(PDF) 23 Page - GigaDevice Semiconductor (Beijing) Inc.

部品番号 GD25LB128DSJS
部品情報  1.8V Uniform Sector Dual and Quad Serial Flash
PDF  75 Pages
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メーカー  GIGADEVICE [GigaDevice Semiconductor (Beijing) Inc.]
ホームページ  http://www.gigadevice.com/
Logo GIGADEVICE - GigaDevice Semiconductor (Beijing) Inc.

GD25LB128DSJS データシート(HTML) 23 Page - GigaDevice Semiconductor (Beijing) Inc.

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1.8V Uniform Sector
Dual and Quad Serial Flash
GD25LB128D
23
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, and each bit is latched-in on the rising edge of SCLK. Then the memory content, at
that address, is shifted out on SO, and each bit is shifted out, at a Max frequency fC, on 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.
Figure8. Read Data Bytes at Higher Speed 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
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 4/6/8/8.
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*



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