W25X40BL Datasheet, PDF (34/55 Pages) Winbond – 2.5V 4M-BIT SERIAL FLASH MEMORY WITH 4KB SECTORS AND DUAL I/O SPI

W25X40BL
7.2.22 Read Manufacturer / Device ID Dual I/O (92h)
The 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-bit address (A23-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 23. The Device
ID value for the W25X40BL is 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
Mode 3
Mode 0
DI
(IO₀)
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
Instruction (92h)
A23-16
A15-8
A7-0 (00h)
M7-0
6420642064206420
DO
(IO₁)
* ^{= MSB}
High Impedance
7531753175317531
*
*
*
*
/CS
CLK
DI
(IO₀)
DO
(IO₁)
23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38
IOs switch from
Input to Output
06420642064206420
17531753175317531
* MFR ID
* Device ID
* MFR ID
(repeat)
* Device ID
(repeat)
Mode 3
Mode 0
Note:
Figure 23. Read Manufacturer / Device ID Dual I/O Diagram
The “Continuous Read Mode” bits M7-0 must be set to Fxh to be compatible with Fast Read Dual I/O instruction.
- 34 -