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AT25SL321

DS-25SL321–112H–2020-10

8.26 Read Manufacturer / Device ID (92h) — Dual I/O

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

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

both the SI and SO pins. During the address transfer, the SI and SO pins are inputs, allowing the 24-bit address to

be transferred in only 12 clocks. Device hardware then switches the SI and SO pins to outputs and drives the

manufacturer/device ID information on these two pins, again requiring only half the number of clocks as required

by the 90h instruction. The 92h instruction is called a 1-2-2 transfer, where the instruction is transferred on a single

pin (SI), and the address and data are driven on two pins (SI and SO).

The instruction is initiated by driving the CS pin low and shifting the instruction code 92h 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 8-44. A minimum

of eight clock cycles are required to transfer the information.

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 8-44. Read Dual Manufacturer/ Device ID Dual I/O Instruction (SPI Mode)

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