W25P10 Datasheet, PDF (24/35 Pages) Winbond – 1M-BIT, 2M-BIT AND 4M-BIT SERIAL FLASH MEMORY WITH 40MHZ SPI

W25P10, W25P20 AND W25P40
7.2.14 Read Manufacturer / Device ID (90h)
The Read Manufacturer/Device ID instruction is an alternative to the Release from Power-down /
Device ID instruction that provides both the JEDEC assigned manufacturer ID and the specific device
ID.
The Read Manufacturer/Device ID instruction is very similar to the Release from Power-down / Device
ID instruction. The instruction is initiated by driving the /CS pin low and shifting the instruction code
“90h” followed by a 24-bit address (A23-A0) of 000000h. After which, the Manufacturer ID for Winbond
(EFh) and the Device ID are shifted out on the falling edge of CLK with most significant bit (MSB) first
as shown in figure 16. The Device ID values for the W25P10, W25P20, and W25P40 are listed in the
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.
Figure 16. Read Manufacturer / Device ID Diagram
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