GD25Q21 datasheet(33/49 Pages) ELM

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GD25Q21BxIGx Uniform Sector Dual and Quad Serial Flash

7.24. Read Manufacture ID/Device ID Dual I/O (92H)

The Read Manufacturer/Device ID Dual 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

dual I/O.

The command is initiated by driving the CS# pin low and shifting the command code “92H” 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 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 Dual I/O Sequence Diagram

Command

0 1 2 3 4 5 6 7

92H

CS#

SCLK

SI(IO0)

SO(IO1)

8 9 10 11 12 13 14 15

6 4 2 0 6 4 2 0

16 17 18 19 20 21 22 23

6 4 2 0 6 4 2 0

7 5 3 1 7 5 3 1 7 5 3 1 7 5 3 1

A23-16

A15-8

A7-0

M7-0

CS#

23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39

SI(IO0)

SO(IO1)

6 4 2 0 6 4 2 0 6 4 2 0 6 4 2 0

7 5 3 1 7 5 3 1 7 5 3 1 7 5 3 1

SCLK

MFR ID

Device ID

40 41 42 43

6 4 2 0

7 5 3 1

44 45 46 47

6 4 2 0

7 5 3 1

MFR ID

(Repeat)

Device ID

(Repeat)

MFR ID

(Repeat)

Device ID

(Repeat)

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