Uniform Sector

Standard and Dual Serial Flash

GD25WD80C

22

7.15.

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 that, 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 Figure16. If the 24-bit address is initially set to 000001H, the Device ID will be

read first.

Figure16. 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