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AT25SL321

DS-25SL321–112H–2020-10

8.27 Read Manufacturer / Device ID Quad I/O (94h)

The Read Manufacturer/Device ID Quad I/O instruction provides both the JEDEC assigned manufacturer ID and

the specific device ID. This command allows both address and manufacturer/device ID information to be driven on

the SI (IO0), SO (IO1), WP (IO2), and HOLD (IO3) pins. During the address transfer, the IO0, IO1, IO2, and IO3 pins

are inputs, allowing the 24-bit address to be transferred in only 6 clocks. Device hardware then switches these pins

to outputs and drives the manufacturer/device ID information on these pins, transferring the information in one-

fourth the number of clocks required by the 90h instruction. The 94h instruction is called a 1-4-4 transfer, where the

instruction in transferred on a single pin (IO0), and the address and data are driven on four pins (IO0 - IO3).

The instruction is initiated by driving the CS pin low and shifting the instruction code 94h followed by a 24-bit

address (A23-A0) of 000000h. After which, the Manufacturer ID for Adesto (1Fh) and the Device ID (17h) are

shifted out on the falling edge of SCK with most significant bit (MSB) first as shown in Figure 8-45. If the 24-bit

address is initially set to 000001h the Device ID is read first and then followed by the Manufacturer ID. The

Manufacturer and Device ID can be read continuously, alternating from one to the other. The instruction is

completed by driving CS high.

Figure 8-45. Read Quad Manufacturer/ Device ID Quad I/O instruction (SPI Mode)

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