W25Q16DW Datasheet, PDF (58/83 Pages) Winbond – 1.8V 16M-BIT SERIAL FLASH MEMORY WITH DUAL/QUAD SPI & QPI

W25Q16DW
10.2.32 Read Manufacturer / Device ID Quad I/O (94h)
The Read Manufacturer / Device ID Quad 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 4x speed.
The Read Manufacturer / Device ID Quad I/O instruction is similar to the Fast Read Quad I/O instruction.
The instruction is initiated by driving the /CS pin low and shifting the instruction code “94h” followed by a
four clock dummy cycles and then a 24-bit address (A23-A0) of 000000h, but with the capability to input
the Address bits four bits per clock. After which, the Manufacturer ID for Winbond (EFh) and the Device ID
are shifted out four bits per clock on the falling edge of CLK with most significant bit (MSB) first as shown
in Figure 31. The Device ID values for the W25Q16DW 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
IO₀
IO₁
IO₂
IO₃
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 (94h)
High Impedance
High Impedance
High Impedance
A23-16
40
A15-8
40
A7-0
(00h)
40
M7-0
40
Dummy Dummy
4
IOs switch from
Input to Output
040
51515151
5151
62626262
6262
73737373
7373
MFR ID Device ID
/CS
CLK
23 24 25 26 27 28 29 30
Mode 3
Mode 0
IO₀
040404040
IO₁
151515151
IO₂
262626262
IO₃
373737373
MFR ID Device ID MFR ID Device ID
(repeat) (repeat) (repeat) (repeat)
Note:
Figure 31. Read Manufacturer / Device ID Quad I/O Instruction (SPI Mode only)
The “Continuous Read Mode” bits M(7-0) must be set to Fxh to be compatible with Fast Read Quad I/O instruction.
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