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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
47
7.24. Read Manufacture ID/ Device ID (REMS) (90H)
The Read Manufacturer/Device ID command is an alternative to the Release from Power-Down / Device ID command
that provides both the JEDEC assigned Manufacturer ID and the specific Device ID.
The command is initiated by driving the CS# pin low and shifting the command code “90H” followed by a 24-bit address
(A23-A0) of 000000H. After which, the Manufacturer ID and the Device ID are shifted out on the falling edge of SCLK with
most significant bit (MSB) first as shown in Figure25. If the 24-bit address is initially set to 000001H, the Device ID will be
read first.
Figure25. Read Manufacture ID/ Device ID Sequence Diagram
Command
0
1
2
3
4
5
6
7
90H
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
32
42 43 44 45
41
46 47
40
7
Device ID
CS#
SCLK
SI
SO
MSB
Manufacturer ID
6
5
4
3
2
1
0
7
Figure25a. Read Manufacture ID/ Device ID Sequence Diagram (QPI)
CS#
SCLK
IO0
IO1
IO2
IO3
0
1
2
3
4
5
Command
90H
6
7
8
0
1
3
4
5
7
2
6
IOs switch from
Input to Output
Device
ID
MID
0
4
1
5
2
6
3
7
3
7
2
6
1
5
0
4
9
10
A23-16
A15-8
A7-0
8
9
19
12
13
23
10
14
11
15
18
22
17
21
16
20
(00H)



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