W25X10AL Datasheet, PDF (30/45 Pages) Winbond – 1M-BIT, 2M-BIT, 4M-BIT AND 8M-BIT 2.5V SERIAL FLASH MEMORY WITH 4KB SECTORS AND DUAL OUTPUT SPI

W25X10AL, W25X20AL, W25X40AL, W25X80AL
10.2.17 JEDEC ID (9Fh)
For compatibility reasons, the W25X10AL/20AL/40AL/80AL 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
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