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W25X10A, W25X20A, W25X40A, W25X80A
10.2.16 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 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 18. The Device ID values for the W25X10A, W25X20A, W25X40A and W25X80A
are 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.
Figure 18. Read Manufacturer / Device ID Diagram
Publication Release Date: August 7, 2009
- 29 -
Revision F
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