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W25Q64FV
6.2.34
Read JEDEC ID (9Fh)
For compatibility reasons, the W25Q64FV 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 Manuf acturer 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 )
Memory Type ID15-8
Capacity ID7-0
Mode 0
DO
(IO 1 )
7
*
6
5
4
3
2
1
0
7
*
6
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
In structio 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)
- 61 -
Publication Release Date:
October 07, 2013
Revision L
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W25Q64FVSSIG TR 制造商:Winbond Electronics Corp 功能描述:SPIFLASH, 64M-BIT, 4KB UNIFORM 制造商:Winbond Electronics Corp 功能描述:IC FLASH 64MBIT 104MHZ 8SOIC 制造商:Winbond 功能描述:SPIFLASH, 64M-BIT, 4KB UNIFORM
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