W25X32A Datasheet, PDF (30/45 Pages) Winbond – 32M-BIT SERIAL FLASH MEMORY WITH 4KB SECTORS AND DUAL OUTPUT SPI

W25X32A
10.2.17 JEDEC ID (9Fh)
For compatibility reasons, the W25X32A 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 19. For memory type and capacity values refer to Manufacturer and Device Identification
table.
Figure 19. Read JEDEC ID instruction Sequence Diagram
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