11.2.24 Read Manufacturer/ Device ID (90h),(EFh),(DFh)
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
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” or “EFh” or “DFh” followed by a 24-bit address (A23-A0) of 000000h. After
which, the Manufacturer ID for FIDELIX SEMICONDUCTOR (F8h) and the Device ID are shifted
out on the falling edge of CLK with most significant bit(MSB) first as shown in figure 24a, 24b or
24c. The Device ID value for the FM25Q32 is 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 24a. Read Manufacturer/ Device ID Diagram