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Giải thích chi tiết về linh kiện  1.8V Uniform Sector Dual and Quad Serial Flash
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1.8V Uniform Sector
Dual and Quad Serial Flash
GD25LB256D
60
7.37. Burst Read with Wrap for Higher 128Mb (8DH)
The
“Burst Read with Wrap for Higher 128Mb (8DH)” command provides an alternative way to perform the read
operation with
“Wrap Around” in QPI mode. This command is similar to the “Fast Read (0BH)” command in QPI mode,
except the addressing of the read operation will
“Wrap Around” to the beginning boundary of the “Wrap Around” once the
ending boundary is reached. The
“Wrap Length” and the number of dummy clocks can be configured by the “Set Read
Parameters (C0H)
” command. The “Burst Read with Wrap for higher 128Mb (8DH)” command will read out the memory
content from 1000000H to 1FFFFFFH.
The “Burst Read with Wrap for Higher 128Mb (8DH)” command sequence: CS# goes low  sending The “Burst Read
with Wrap for Higher 128Mb (8DH)
” command  sending 3-byte address (A23-A0, The A24 default value is 1)  sending
dummy byte  then data out.
Figure37. Burst Read with Wrap for Higher 128Mb command Sequence Diagram
CS#
SCLK
IO0
IO1
IO2
IO3
0
1
2
3
4
5
Command
8DH
20
12
16
8
6
7
8
9
10
4
0
4
0
4
0
4
21
13
17
9
5
1
5
1
5
1
5
22
14
18
10
6
2
6
2
6
2
6
23
15
19
11
7
3
7
3
7
3
7
A23-16
A15-8
A7-0
Dummy*
11
12 13
14
IOs switch from
Input to output
Byte1
Byte2
Byte3
*"Set Read Parameters" Command (C0H)
can set the number of dummy clocks



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