W25Q128FVSIF-TR Datasheet, PDF (68/100 Pages) Winbond – 3V 128M-BIT SERIAL FLASH MEMORY WITH DUAL/QUAD SPI & QPI

W25Q128FV
8.2.29 Read JEDEC ID (9Fh)
For compatibility reasons, the W25Q128FV 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 43a & 43b. For
memory type and capacity values refer to Manufacturer and Device Identification table.
/CS
CLK
DI
(IO₀)
DO
(IO₁)
/CS
CLK
Mode 3
Mode 0
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Instruction (9Fh)
* ^{= MSB}
High Impedance
Manufacturer ID (EFh)
15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Mode 3
Mode 0
DI
(IO₀)
DO
(IO₁)
Memory Type ID15-8
Capacity ID7-0
7654321076543210
*
*
Figure 43a. Read JEDEC ID Instruction (SPI Mode)
/CS
CLK
IO₀
Mode 3
Mode 0
0123456
Instruction
9Fh
IOs switch from
Input to Output
12 8 4 0
IO₁
13 9 5 1
IO₂
14 10 6 2
IO₃
15 11 7 3
EFh
ID15-8 ID7-0
Mode 3
Mode 0
Figure 43b. Read JEDEC ID Instruction (QPI Mode)
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