AT25QL641 datasheet(48/80 Pages) RENESAS

48 / 80 page

DS-AT25QL641-130 Rev. G

Page 48

Sep 14, 2022

AT25QL641 Datasheet

Figure 44. Release Power-Down / Device ID Command (SPI Mode)

8.25 Read Manufacturer / Device ID I/O (90h)

The Read Manufacturer/ Device ID command provides both the JEDEC assigned manufacturer ID and the

specific device ID. This command can be issued in both SPI mode and QPI mode. In SPI mode, the 90h

command is called a 1-1-1 transfer, where the command, address, and data are all driven on a single pin (SI for

command and address, and SO for data). In QPI mode, the 90h command is called a 4-4-4 transfer, where the

command, address, and data are driven on the bidirectional IO0 - IO3 pins.

Note that in QPI mode, the following events must occur in this order:

1. Set the QE bit in Status Register-2

2. Execute the QPI Enable (38h) command

3. Execute the 90h command

In SPI mode, the operation is initiated by driving the CS pin low and then driving the command code 90h onto the

SI pin, followed by a 24-bit address (A23-A0) of 000000h. The 90h command requires 8 clocks to transfer, and

the 24-bit address requires 24 clocks to transfer. The Manufacturer ID for Renesas Electronics (1Fh) and the

Device ID (17h) are shifted out on the SO pin on the falling edge of SCK with most significant bit (MSB) first. A

minimum or 16 clocks are required to transfer the manufacturer and device ID 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.

In QPI mode, the SI, SO, WP, and HOLD pins are configured as bidirectional pins IO0, IO1, IO2, and IO3

respectively. The 90h operation the operation is initiated by driving the CS pin low and then driving the command

code 90h onto the IO0 - IO3 pins, followed by a 24-bit address (A23-A0) of 000000h. The 90h command requires

2 clocks to transfer, and the 24-bit address requires 6 clocks to transfer. The Manufacturer ID for Renesas

Electronics (1Fh) and the Device ID (17h) are shifted out on the bidirectional IO0 - IO3 pins on the falling edge of

SCK, with most significant bit (MSB) first. A minimum or 4 clocks are required to transfer the

manufacturer and device ID 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 shows the 90h command as executed in SPI mode. In this mode the command and address are driven

on the SI pin.

246

Mode 3

Mode 0

Mode 3

Mode 0

RES2

Power-Down Current

Stand-By Current

High-Impedance

SCK

Command (ABh)

3 Dummy Bytes

Device ID

MSB

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