AT25QL321 datasheet(50/82 Pages) RENESAS

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DS-AT25QL321-131 Rev. D

Page 50

Nov 1, 2022

AT25QL321 Datasheet

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

The Read Manufacturer/ Device ID Dual I/O command 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 command. The 92h command is called a 1-2-2 transfer, where the command is transferred on a single

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

The command is initiated by driving the CS pin low and shifting the command code 92h followed by a 24-bit

address (A23-A0) of 000000h. After which, the Manufacturer ID for Renesas Electronics (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 45. 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 command is

completed by driving CS high.

Figure 45. Read Dual Manufacturer/ Device ID Dual I/O Command (SPI Mode)

25 26 27 28 29 30 31 32 33 34 35 36 37 38 39

SCK

MSB

420

6420

7531

IOs switch from

Input to Output

SCK

6420

7531

6420

7531

6420

7531

123

89 10 11 12 13 14 15

16 17 18 19 20 21 22 23

Mode 3

Mode 0

Mode 3

Mode 0

A23-16

Command (92h)

High-Impedance

A15-8

MFR ID

Device ID

MFR ID

(Repeat)

Device ID

(Repeat)

A7-0 (00h

or 01h)

M7-0

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