GD25Q21 datasheet(34/49 Pages) ELM

34 / 49 page

Rev.1.1

49 -

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GD25Q21BxIGx Uniform Sector Dual and Quad Serial Flash

Figure 30. Read Manufacture ID/Device ID Quad I/O Sequence Diagram

Command

0 1 2 3 4 5 6 7

94H

CS#

SCLK

SI(IO0)

SO(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

WP#(IO2)

HOLD#(IO3)

Dummy

MFR ID DID

CS#

SCLK

SI(IO0)

SO(IO1)

WP#(IO2)

HOLD#(IO3)

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)

7.25. Read Manufacture ID/Device ID Quad I/O (94H)

The Read Manufacturer/Device ID Quad I/O 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 shifting the command code “94H” 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 Figure30. If the 24-bit address is

initially set to 000001H, the Device ID will be read first.

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