W25Q64DWZEIG【PDF 59/82 页】IC FLASH SPI 64MBIT 8WSON

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W25Q64DW

10.2.34 Read JEDEC ID (9Fh)

For compatibility reasons, the W25Q64DW provides several instructions to electronically determine the

identity of the device. The Read JEDEC ID instruction is compatible with the JEDEC standard for SPI

compatible serial memories that was adopted in 2003. The instruction is initiated by driving the /CS pin low

and shifting the instruction code “9Fh”. The JEDEC assigned Manufacturer ID byte for Winbond (EFh) and

two Device ID bytes, Memory Type (ID15-ID8) and Capacity (ID7-ID0) are then shifted out on the falling

edge of CLK with most significant bit (MSB) first as shown in Figure 33a & 33b. For memory type and

capacity values refer to Manufacturer and Device Identification table.

/CS

Mode 3

0

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

CLK

Mode 0

Instruction (9Fh)

DI

(IO 0 )

DO

(IO 1 )

/CS

* = MSB

High Impedance

Manufacturer ID (EFh)

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

Mode 3

CLK

DI

(IO 0 )

Mode 0

DO

(IO 1 )

7

*

6

Memory Type ID15-8

5 4 3 2

1

0

7

*

6

Capacity ID7-0

5 4 3 2

1

0

Figure 33a. Read JEDEC ID Instruction (SPI Mode)

/CS

Mode 3

0

1

2

3

4

5

6

Mode 3

CLK

Mode 0

I nstructio n

9Fh

IOs switch from

Input to Output

Mode 0

IO 0

IO 1

IO 2

IO 3

12

13

14

15

8

9

10

11

4

5

6

7

0

1

2

3

EFh

ID15-8

ID7-0

Figure 33b. Read JEDEC ID Instruction (QPI Mode)

Publication Release Date: September 18, 2012

- 59 -

Revision D

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