FOR MOBILE APPLICATIONS
W25Q256FV
Publication Release Date: May 13, 2012
- 74 - Preliminary - Revision M1
8.2.36
Read Manufacturer / Device ID Dual I/O (92h)
The Read Manufacturer / Device ID Dual I/O instruction is an alternative to the Read Manufacturer /
Device ID instruction that provides both the JEDEC assigned manufacturer ID and the specific device ID
at 2x speed.
The Read Manufacturer / Device ID Dual I/O instruction is similar to the Fast Read Dual I/O instruction.
The instruction is initiated by driving the /CS pin low and shifting the instruction code “92h” followed by a
24/32-bit address (A23/A31-A0) of 000000h, but with the capability to input the Address bits two bits per
clock. After which, the Manufacturer ID for Winbond (EFh) and the Device ID are shifted out 2 bits per
clock on the falling edge of CLK with most significant bits (MSB) first as shown in Figure 40. The Device
ID values for the W25Q256FV are listed in Manufacturer and Device Identification table. If the 24-bit
address is initially set to 000001h the Device ID will be read first and then followed by the Manufacturer ID.
The Manufacturer and Device IDs can be read continuously, alternating from one to the other. The
instruction is completed by driving /CS high.
/CS
CLK
DI
(IO
0
)
DO
(IO
1
)
Mode 0
Mode 3
0
1
2
3
4
5
6
7
Instruction (92h)
High Impedance
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
7
5
3
1
*
*
6
4
2
0
7
5
3
1
6
4
2
0
7
5
3
1
6
4
2
0
7
5
3
1
6
4
2
0
23
*
*
A23-16
A15-8
A7-0 (00h)
M7-0
/CS
CLK
DI
(IO
0
)
DO
(IO
1
)
24
25
26
27
28
29
30
31
32
33
34
36
37
38
35
23
0
Mode 0
Mode 3
7
5
3
1
6
4
2
0
7
5
3
1
6
4
2
0
7
5
3
1
6
4
2
0
7
5
3
6
4
2
1
0
1
MFR ID
Device ID
MFR ID
(repeat)
Device ID
(repeat)
IOs switch from
Input to Output
*
*
*
*
= MSB
*
Figure 40. Read Manufacturer / Device ID Dual I/O Instruction (SPI Mode only)
32-Bit Address is required when the device is operating in 4-Byte Address Mode
Note:
The “Continuous Read Mode” bits M(7-0) must be set to Fxh to be compatible with Fast Read Dual I/O instruction.
