GD25LQ40xIGx 1.8V Uniform Sector Dual and Quad Serial Flash
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7.22. 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 Figure24. If the 24-bit address is
initially set to 000001H, the Device ID will be read first.
Figure 24. Read Manufacture ID/Device ID Sequence Diagram
Figure 24a. Read Manufacture ID/Device ID Sequence Diagram (QPI)
CS#
0
1
2
3
4
5
6
7
8
9
10
IOs switch from
SCLK
Command
90H
A7-0
(00H)
Input to Output
A23-16 A15-8
IO0
0
0
1
2
3
4
5
6
7
0
12
8
4
5
6
7
4
5
6
7
20 16
IO1
IO2
IO3
1
2
3
9
1
2
3
21 17 13
18 14 10
22
15 11
23 19
Device
ID
MID
Rev.1.0
59 - 37
ELM [ ELM ELECTRONICS ]
