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Giải thích chi tiết về linh kiện  3.3V Uniform Sector Dual and Quad Serial Flash
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3.3V Uniform Sector
Dual and Quad Serial Flash
GD25B32C
34
7.25.
Quad I/O Read Manufacture ID/ Device ID (94H)
The Quad I/O 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 by quad I/O.
The command is initiated by driving the CS# pin low and s
hifting the command code “94H” followed by a 24-bit
address (A23-A0) of 000000H
, and 4 dummy clocks. 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 Figure29. If the 24-bit address is initially set to
000001H, the Device ID will be read first.
Figure 29. Read Manufacture ID/ Device ID Quad I/O Sequence Diagram
7.26.
Read Identification (RDID) (9FH)
The Read Identification (RDID) command allows the 8-bit manufacturer identification to be read, followed by two
bytes of device identification. The device identification indicates the memory type in the first byte, and the memory capacity
of the device in the second byte. The Read Identification (RDID) command while an Erase or Program cycle is in progress
is not decoded, and has no effect on the cycle that is in progress. The Read Identification (RDID) command should not be
issued while the device is in Deep Power-Down Mode.
The device is first selected by driving CS# to low. Then, the 8-bit command code for the command is shifted in. This is
followed by the 24-bit device identification, stored in the memory, being shifted out on Serial Data Output, each bit being
Command
0
1
2
3
4
5
6
7
94H
CS#
SCLK
IO0
IO1
8
9 10 11 12 13 14 15
4
0
4
0
4
0
4
0
16 17 18 19 20 21 22 23
4
0
4
0
5
1
5
1
5
1
5
1
5
1
5
1
A23-16 A15-8 A7-0
M7-0
6
2
6
2
6
2
6
2
6
2
6
2
7
3
7
3
7
3
7
3
7
3
7
3
IO2
IO3
Dummy
MFR ID
DID
CS#
SCLK
24 25 26 27 28 29 30 31
4
0
4
0
5
1
5
1
6
2
6
2
7
3
7
3
MFR ID
(Repeat)
DID
(Repeat)
4
0
4
0
5
1
5
1
6
2
6
2
7
3
7
3
MFR ID
(Repeat)
DID
(Repeat)
IO0
IO1
IO2
IO3



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